:root {
  --red: #df0d14;
  --red-dark: #b90008;
  --black: #101114;
  --ink: #252a31;
  --muted: #69717d;
  --line: #eceef2;
  --soft: #f6f7f9;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(18, 20, 24, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  background: #fff;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 92px;
  padding: 14px clamp(20px, 4vw, 64px);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 560px;
}

.mascot {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 82px;
  width: 82px;
  height: 78px;
  overflow: visible;
}

.mascot img {
  display: block;
  width: 86px;
  height: 78px;
  object-fit: contain;
  object-position: center center;
}

.brand-title {
  display: grid;
  gap: 4px;
  align-items: start;
}

.brand-cn {
  color: #090a0c;
  font-size: 38px;
  font-weight: 950;
  line-height: 1;
  letter-spacing: 0;
}

.brand-cn span {
  color: var(--red);
}

.brand-en {
  display: block;
  width: 180px;
  height: 18px;
  line-height: 1;
}

.brand-en img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
}

.brand-divider {
  width: 2px;
  height: 56px;
  margin-left: 8px;
  margin-right: 8px;
  background: #3c4047;
}

.brand-meta {
  display: grid;
  gap: 8px;
  color: var(--black);
  min-width: 250px;
}

.brand-meta strong {
  color: #090a0c;
  font-size: 22px;
  font-weight: 900;
  line-height: 1.05;
}

.brand-meta small {
  color: #565b63;
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 2.2vw, 34px);
  flex: 1;
  font-size: 16px;
  font-weight: 800;
  white-space: nowrap;
}

.main-nav a {
  position: relative;
  padding: 18px 0;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 8px;
  width: 100%;
  height: 3px;
  background: var(--red);
  border-radius: 999px;
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.main-nav a:hover {
  color: var(--red);
}

.main-nav a.active {
  color: var(--black);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  transform: scaleX(1);
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 900;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
}

.header-cta,
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--red), #f02026);
  box-shadow: 0 12px 28px rgba(223, 13, 20, 0.22);
}

.btn-outline {
  color: var(--red);
  background: #fff;
  border: 1px solid rgba(223, 13, 20, 0.45);
}

.btn-soft {
  color: var(--red-dark);
  background: #fff4f4;
  border: 1px solid rgba(223, 13, 20, 0.18);
}

.header-cta:hover,
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(223, 13, 20, 0.22);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: none;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--black);
  border-radius: 999px;
  transition:
    background 0.2s ease,
    transform 0.2s ease;
}

.menu-toggle:hover,
.menu-toggle:focus,
.menu-toggle[aria-expanded="true"] {
  background: #fff;
  border-color: #d9dde4;
  box-shadow: 0 8px 20px rgba(15, 17, 21, 0.08);
  outline: none;
}

.menu-toggle:hover span,
.menu-toggle:focus span,
.menu-toggle[aria-expanded="true"] span {
  background: var(--black);
}

.hero-section {
  position: relative;
  display: grid;
  grid-template-columns: minmax(420px, 0.43fr) minmax(620px, 0.57fr);
  min-height: 780px;
  overflow: hidden;
  padding: clamp(58px, 6vw, 92px) clamp(24px, 5vw, 96px) 42px;
  background:
    radial-gradient(circle at 70% 42%, rgba(223, 13, 20, 0.06), transparent 34%),
    linear-gradient(90deg, #fff 0%, rgba(255, 255, 255, 0.98) 40%, rgba(247, 247, 247, 0.94) 100%),
    radial-gradient(circle at 72% 42%, #ffffff 0 16%, #eef0f3 58%, #ffffff 100%);
}

.hero-section::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 160px;
  background:
    linear-gradient(transparent, rgba(255, 255, 255, 0.92)),
    repeating-linear-gradient(170deg, rgba(18, 20, 24, 0.07) 0 1px, transparent 1px 62px);
  pointer-events: none;
}

.pattern-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.pattern-sheet {
  position: absolute;
  width: 280px;
  height: 360px;
  opacity: 0.32;
  background:
    linear-gradient(90deg, rgba(20, 24, 28, 0.08) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(rgba(20, 24, 28, 0.08) 1px, transparent 1px) 0 0 / 34px 34px,
    radial-gradient(ellipse at 58% 42%, transparent 0 34%, rgba(20, 24, 28, 0.24) 35% 36%, transparent 37%),
    #fff;
  border: 1px solid rgba(20, 24, 28, 0.08);
}

.sheet-left {
  left: 22px;
  bottom: -45px;
  transform: rotate(-8deg);
}

.sheet-right {
  right: 90px;
  top: 130px;
  transform: rotate(6deg);
}

.mannequin {
  position: absolute;
  left: 42%;
  top: 22%;
  width: 126px;
  height: 300px;
  opacity: 0.16;
  background:
    radial-gradient(ellipse at 50% 12%, #5f6670 0 19px, transparent 20px),
    linear-gradient(90deg, transparent 0 26%, #5f6670 27% 73%, transparent 74%),
    radial-gradient(ellipse at 50% 36%, #5f6670 0 54px, transparent 55px);
  filter: blur(1px);
}

.hero-copy,
.hero-visual {
  position: relative;
  z-index: 2;
}

.hero-copy {
  align-self: center;
  max-width: 720px;
}

.company-label {
  display: inline-flex;
  margin: 0 0 30px;
  padding: 10px 16px;
  color: #fff;
  font-size: 22px;
  font-weight: 900;
  background: var(--red);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(223, 13, 20, 0.18);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.hero-copy h1 {
  margin-bottom: 26px;
  color: #08090b;
  font-size: clamp(46px, 4.2vw, 72px);
  line-height: 1.14;
  font-weight: 950;
  letter-spacing: 0;
}

.hero-copy h1 span {
  color: inherit;
}

.hero-copy h1 em {
  color: var(--red);
  font-style: normal;
}

.hero-text {
  max-width: 660px;
  color: #4c5663;
  font-size: clamp(18px, 1.3vw, 24px);
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.trust-tags {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  max-width: 640px;
  margin-top: 38px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 10px;
  box-shadow: 0 18px 50px rgba(18, 20, 24, 0.07);
  backdrop-filter: blur(14px);
}

.trust-tags article {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 2px 14px;
  align-items: center;
  padding: 0 18px;
  border-right: 1px solid var(--line);
}

.trust-tags article:last-child {
  border-right: 0;
}

.line-icon {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 2px solid var(--red);
  border-radius: 50%;
}

.line-icon::before {
  color: var(--red);
  font-weight: 950;
}

.supply-icon::before {
  content: "□";
}

.recycle-icon::before {
  content: "↻";
}

.partner-icon::before {
  content: "人";
}

.trust-tags strong {
  color: #111;
  font-size: 20px;
}

.trust-tags small {
  color: #5b6570;
  font-size: 15px;
}

.hero-visual {
  min-height: 690px;
  align-self: stretch;
}

.showcase-reference {
  position: absolute;
  inset: -18px -38px -10px -58px;
  overflow: hidden;
  border-radius: 0;
  pointer-events: none;
}

.showcase-reference img {
  position: absolute;
  top: -14.2%;
  right: -1%;
  width: auto;
  height: 114.2%;
  max-width: none;
  user-select: none;
  filter: saturate(1.02) contrast(1.01);
}

.showcase-reference::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    linear-gradient(90deg, #fff 0%, rgba(255, 255, 255, 0.88) 8%, rgba(255, 255, 255, 0.25) 21%, rgba(255, 255, 255, 0) 38%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0) 10%, rgba(255, 255, 255, 0) 86%, rgba(255, 255, 255, 0.72) 100%);
}

.showcase-reference::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.7), transparent 24%),
    radial-gradient(ellipse at 54% 78%, rgba(0, 0, 0, 0.04), transparent 42%);
  mix-blend-mode: screen;
  opacity: 0.55;
}

.showcase-fade {
  position: absolute;
  inset: 0;
  z-index: 4;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.82), transparent 28%);
}

.cartridge-showcase {
  position: absolute;
  inset: 0;
}

.product-unit {
  position: absolute;
  display: grid;
  justify-items: center;
}

.unit-grade {
  left: 42%;
  top: 4%;
  z-index: 4;
}

.unit-plus {
  left: 9%;
  bottom: 1%;
  z-index: 5;
}

.unit-standard {
  right: 0;
  top: 27%;
  z-index: 3;
}

.cartridge {
  position: relative;
  z-index: 3;
  width: 118px;
  height: 246px;
  margin-bottom: -30px;
  background:
    linear-gradient(90deg, #101113 0 13%, #202228 14% 22%, transparent 23%),
    linear-gradient(180deg, #17191d 0 14%, #f8f8f7 15% 75%, #17191d 76% 100%);
  border: 4px solid #121317;
  border-radius: 20px 18px 18px 18px;
  box-shadow:
    0 30px 48px rgba(0, 0, 0, 0.22),
    inset -10px 0 0 rgba(0, 0, 0, 0.1);
  transform: perspective(700px) rotateY(-7deg);
}

.unit-grade .cartridge {
  width: 136px;
  height: 284px;
  transform: perspective(700px) rotateY(7deg);
}

.unit-standard .cartridge {
  width: 112px;
  height: 232px;
  transform: perspective(700px) rotateY(8deg);
}

.cap {
  position: absolute;
  left: 8px;
  right: -7px;
  top: -12px;
  height: 42px;
  background: linear-gradient(135deg, #0a0b0d, #2c2e34);
  border-radius: 16px 18px 8px 8px;
}

.cap::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 40px;
  height: 30px;
  background: repeating-linear-gradient(90deg, #070809 0 4px, #1a1b1f 4px 8px);
  border-radius: 12px 0 0 8px;
}

.label {
  position: absolute;
  left: 18px;
  top: 74px;
  width: 84px;
  min-height: 110px;
  padding: 10px 8px;
  background: #fff;
  border-right: 8px solid var(--red);
  border-radius: 2px 10px 10px 2px;
}

.unit-grade .label {
  left: 22px;
  top: 82px;
  width: 94px;
}

.dark-label {
  border-right-color: #111;
}

.label b {
  display: block;
  color: var(--red);
  font-size: 28px;
  line-height: 1;
}

.label em {
  color: var(--red);
  font-style: normal;
  font-weight: 900;
}

.label span,
.label small {
  display: block;
  color: #16181b;
  font-size: 9px;
  font-weight: 800;
  line-height: 1.5;
}

.label small {
  width: max-content;
  margin-top: 7px;
  padding: 3px 6px;
  color: #fff;
  background: var(--red);
  border-radius: 999px;
}

.ink-drop {
  position: absolute;
  left: 50%;
  bottom: 34px;
  width: 15px;
  height: 19px;
  background: var(--red);
  border-radius: 50% 50% 60% 60%;
  transform: translateX(-50%) rotate(45deg);
}

.tech-podium {
  position: relative;
  width: 350px;
  height: 166px;
  background:
    radial-gradient(ellipse at 50% 2%, #fff 0 42%, transparent 43%),
    linear-gradient(180deg, #fdfbf8, #e5e2dc);
  border: 1px solid #dedbd5;
  border-radius: 50% / 22%;
  box-shadow:
    0 34px 60px rgba(0, 0, 0, 0.14),
    inset 0 0 0 2px rgba(255, 255, 255, 0.7);
}

.podium-grade {
  width: 360px;
  height: 182px;
}

.podium-standard {
  width: 310px;
  height: 158px;
}

.podium-top {
  position: absolute;
  left: 3%;
  right: 3%;
  top: -1px;
  height: 64px;
  background:
    repeating-linear-gradient(0deg, transparent 0 18px, rgba(20, 24, 28, 0.08) 19px),
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(20, 24, 28, 0.07) 19px),
    radial-gradient(ellipse at 50% 50%, transparent 0 45%, rgba(223, 13, 20, 0.6) 46% 47%, transparent 48%),
    #fbfaf7;
  border: 1px solid rgba(223, 13, 20, 0.18);
  border-radius: 50%;
}

.podium-front {
  position: absolute;
  left: 50%;
  bottom: 25px;
  display: grid;
  min-width: 118px;
  padding-top: 8px;
  color: var(--red-dark);
  text-align: center;
  transform: translateX(-50%);
}

.podium-front::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -20px;
  width: 4px;
  height: 58px;
  background: linear-gradient(180deg, rgba(223, 13, 20, 0), rgba(223, 13, 20, 0.95), rgba(223, 13, 20, 0));
  border-radius: 999px;
  box-shadow: 0 0 12px rgba(223, 13, 20, 0.42);
  transform: translateX(-50%);
}

.podium-front strong {
  font-size: 18px;
}

.podium-front small {
  font-size: 16px;
  font-weight: 900;
}

.callout {
  position: absolute;
  z-index: 6;
  display: grid;
  color: #111;
  font-weight: 900;
}

.callout strong {
  color: var(--red);
  font-size: 31px;
}

.callout span {
  font-size: 18px;
  line-height: 1.35;
}

.callout::after {
  content: "";
  position: absolute;
  top: 24px;
  height: 2px;
  background: var(--red);
}

.callout-left {
  left: -78px;
  top: 80px;
}

.callout-left::after {
  left: 104px;
  width: 82px;
}

.callout-center {
  left: -175px;
  top: 88px;
}

.callout-center::after {
  left: 130px;
  width: 115px;
}

.callout-right {
  right: -112px;
  top: 86px;
}

.callout-right::after {
  right: 93px;
  width: 72px;
}

.brand-sticker {
  position: absolute;
  right: 12%;
  bottom: 6%;
  z-index: 8;
  display: grid;
  padding: 9px 16px 12px;
  color: #fff;
  background: #111;
  border: 4px solid #fff;
  border-radius: 12px;
  box-shadow:
    0 0 0 3px #ffbd42,
    0 18px 34px rgba(0, 0, 0, 0.2);
  transform: rotate(-5deg);
}

.brand-sticker span {
  font-size: 24px;
  font-weight: 950;
}

.brand-sticker strong {
  color: #fff;
  font-size: 32px;
  line-height: 1;
  text-shadow: 3px 3px 0 var(--red);
}

.section {
  padding: 86px clamp(24px, 6vw, 110px);
}

.section-heading {
  max-width: 820px;
  margin: 0 auto 38px;
  text-align: center;
}

.section-heading p,
.eyebrow {
  margin-bottom: 10px;
  color: var(--red);
  font-weight: 900;
}

.section h2 {
  color: #111;
  font-size: clamp(30px, 3vw, 48px);
  line-height: 1.2;
  font-weight: 950;
}

.card-grid,
.grade-grid,
.case-grid {
  display: grid;
  gap: 22px;
}

.three {
  grid-template-columns: repeat(3, 1fr);
}

.four,
.case-grid {
  grid-template-columns: repeat(4, 1fr);
}

.service-card,
.info-card,
.grade-card,
.case-grid article {
  min-height: 210px;
  padding: 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(18, 20, 24, 0.06);
}

.tutorial-grid {
  align-items: stretch;
}

.tutorial-card {
  display: flex;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  flex-direction: column;
}

.tutorial-card img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #f7f7f7;
}

.tutorial-card img.is-zoomable {
  cursor: zoom-in;
}

.tutorial-card img.is-zoomable:focus-visible {
  outline: 3px solid rgba(223, 13, 20, 0.36);
  outline-offset: -3px;
}

.tutorial-card div {
  padding: 22px;
}

.service-section,
.application-section,
.case-section {
  background: var(--soft);
}

.card-number {
  color: var(--red);
  font-size: 14px;
  font-weight: 950;
}

.service-card h3,
.info-card h3,
.grade-card h3,
.case-grid h3 {
  color: #111;
  font-size: 24px;
}

.service-card p,
.info-card p,
.grade-card p,
.split-section p,
.contact-copy p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.grade-grid {
  grid-template-columns: 1.08fr 1.18fr 1fr;
}

.grade-card {
  position: relative;
  overflow: hidden;
  min-height: 250px;
  background:
    linear-gradient(135deg, #fff, #fafafa),
    repeating-linear-gradient(90deg, transparent 0 24px, rgba(20, 24, 28, 0.04) 25px);
}

.grade-card::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -80px;
  width: 180px;
  height: 180px;
  border: 28px solid rgba(223, 13, 20, 0.08);
  border-radius: 50%;
}

.grade-card span {
  color: var(--red);
  font-size: 28px;
  font-weight: 950;
}

.recommended {
  border-color: rgba(223, 13, 20, 0.42);
  box-shadow: 0 24px 55px rgba(223, 13, 20, 0.12);
}

.split-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 42px;
  align-items: center;
}

.process-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 28px;
  background:
    linear-gradient(90deg, rgba(223, 13, 20, 0.08), transparent),
    #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.process-board span,
.chip-grid span {
  display: grid;
  place-items: center;
  min-height: 82px;
  padding: 18px;
  color: #111;
  font-size: 20px;
  font-weight: 900;
  background: #fff;
  border: 1px dashed rgba(223, 13, 20, 0.34);
  border-radius: 8px;
}

.recycling-section .process-board {
  align-items: stretch;
  padding: 22px;
  background:
    linear-gradient(90deg, rgba(217, 45, 43, 0.06), transparent),
    #fff;
}

.recycle-image-card {
  position: relative;
  display: flex;
  min-height: 250px;
  margin: 0;
  overflow: hidden;
  flex-direction: column;
  justify-content: space-between;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  box-shadow: 0 18px 42px rgba(18, 20, 24, 0.06);
}

.recycle-image-card img {
  display: block;
  width: 100%;
  height: 198px;
  object-fit: contain;
  object-position: center bottom;
  padding: 12px 10px 0;
  filter: saturate(1.03) contrast(1.02);
}

.recycle-image-card figcaption {
  display: grid;
  place-items: center;
  min-height: 50px;
  color: #111;
  font-size: 18px;
  font-weight: 950;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.78), #fff);
  border-top: 1px solid rgba(217, 45, 43, 0.14);
}

.recycling-section .recycle-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  width: 100%;
}

.recycling-section .recycle-gallery .recycle-image-card {
  display: flex;
}

.recycling-section .recycle-gallery span {
  display: none;
}

/* Applicable scenarios: six image cards. */
.scenario-section {
  padding: 34px 0;
  background:
    radial-gradient(circle at 70% 20%, rgba(217, 45, 43, 0.04), transparent 32%),
    linear-gradient(180deg, #fff 0%, #f8f9fb 100%);
}

.scenario-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 32px;
}

.scenario-section .section-eyebrow {
  margin: 0 0 8px;
  color: #d92d2b;
  font-size: 17px;
  line-height: 1;
  font-weight: 900;
  text-align: center;
}

.scenario-section .section-title {
  max-width: 820px;
  margin: 0 auto 22px;
  color: #111;
  font-size: clamp(26px, 2.35vw, 38px);
  line-height: 1.2;
  font-weight: 950;
  letter-spacing: 0;
  text-align: center;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.scenario-card {
  position: relative;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(217, 45, 43, 0.1);
  border-radius: 14px;
  box-shadow: 0 12px 32px rgba(15, 17, 21, 0.05);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.scenario-card:hover {
  transform: translateY(-6px);
  border-color: rgba(217, 45, 43, 0.34);
  box-shadow: 0 26px 62px rgba(15, 17, 21, 0.1);
}

.scenario-image {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #fff;
}

.scenario-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  transform: none;
  transition: transform 0.35s ease;
}

.scenario-card:hover .scenario-image img {
  transform: none;
}

.scenario-image img.is-zoomable {
  cursor: zoom-in;
}

.scenario-image img.is-zoomable:focus-visible {
  outline: 3px solid rgba(223, 13, 20, 0.36);
  outline-offset: -3px;
}

.scenario-content {
  padding: 12px 16px 14px;
}

.scenario-content h3 {
  margin: 0;
  color: #111;
  font-size: 20px;
  line-height: 1.25;
  font-weight: 900;
}

.scenario-content h3::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 16px;
  margin-right: 8px;
  vertical-align: -3px;
  background: #d92d2b;
  border-radius: 999px;
}

.scenario-content p {
  margin: 6px 0 0;
  color: #667085;
  font-size: 13px;
  line-height: 1.45;
  font-weight: 500;
}

@media (max-width: 760px) {
  .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .scenario-section {
    padding: 64px 0;
  }

  .scenario-container {
    padding: 0 20px;
  }

  .scenario-section .section-title {
    margin-bottom: 40px;
    font-size: clamp(30px, 3vw, 48px);
    line-height: 1.2;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .scenario-content {
    padding: 20px 20px 24px;
  }

  .scenario-content h3 {
    font-size: 24px;
  }

  .scenario-content p {
    font-size: 15px;
  }
}

/* Empty cartridge recycling: category image cards. */
.recycling-section {
  padding: 96px 0;
  padding-bottom: 150px;
  scroll-margin-top: 150px;
  background:
    radial-gradient(circle at 70% 30%, rgba(217, 45, 43, 0.05), transparent 34%),
    linear-gradient(180deg, #fff 0%, #fafafa 100%);
}

.recycling-container {
  display: grid;
  grid-template-columns: 0.34fr 0.66fr;
  gap: 56px;
  align-items: center;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 48px;
}

.recycling-copy {
  max-width: 460px;
}

.recycling-copy .section-eyebrow {
  margin: 0 0 22px;
  color: #667085;
  font-size: 20px;
  font-weight: 900;
}

.recycling-copy h2 {
  margin: 0;
  color: #111;
  font-size: clamp(44px, 4vw, 72px);
  line-height: 1.12;
  font-weight: 950;
  letter-spacing: -0.04em;
}

.recycling-copy p:not(.section-eyebrow) {
  margin: 36px 0 0;
  color: #667085;
  font-size: 20px;
  line-height: 1.8;
  font-weight: 500;
}

.recycling-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  margin-top: 32px;
  padding: 0 30px;
  color: #fff;
  font-size: 18px;
  font-weight: 900;
  text-decoration: none;
  background: #d92d2b;
  border-radius: 10px;
  box-shadow: 0 16px 36px rgba(217, 45, 43, 0.18);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.recycling-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 46px rgba(217, 45, 43, 0.24);
}

.recycling-showcase {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.recycling-card {
  position: relative;
  min-height: 420px;
  padding: 26px 24px 22px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(217, 45, 43, 0.12);
  border-radius: 18px;
  box-shadow: 0 18px 50px rgba(15, 17, 21, 0.06);
}

.recycling-card::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border: 34px solid rgba(217, 45, 43, 0.06);
  border-radius: 999px;
  pointer-events: none;
}

.recycling-card-copy,
.recycling-card-image {
  position: relative;
  z-index: 2;
}

.recycling-card h3 {
  margin: 0;
  color: #111;
  font-size: 24px;
  line-height: 1.2;
  font-weight: 950;
}

.recycling-card p {
  margin: 14px 0 0;
  color: #667085;
  font-size: 15px;
  line-height: 1.65;
  font-weight: 600;
}

.recycling-card-image {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 250px;
  margin-top: 22px;
}

.recycling-card-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center bottom;
}

.recycling-card-image img.is-zoomable {
  cursor: zoom-in;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.recycling-card-image img.is-zoomable:hover,
.recycling-card-image img.is-zoomable:focus-visible {
  filter: contrast(1.04) saturate(1.03);
  transform: translateY(-2px) scale(1.01);
  outline: none;
}

.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 34px;
  background: rgba(8, 9, 12, 0.84);
  backdrop-filter: blur(8px);
}

.image-lightbox.open {
  display: flex;
}

.image-lightbox-img {
  display: block;
  max-width: min(1120px, 94vw);
  max-height: 90vh;
  object-fit: contain;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.36);
}

.image-lightbox-close {
  position: fixed;
  top: 22px;
  right: 24px;
  width: 46px;
  height: 46px;
  color: #fff;
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
}

.image-lightbox-close:hover,
.image-lightbox-close:focus-visible {
  background: var(--red);
  outline: none;
}

body.lightbox-open {
  overflow: hidden;
}

.recycling-support-line {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  color: #667085;
  font-size: 14px;
  font-weight: 700;
  text-align: center;
}

.recycling-support-line span {
  margin: 0 10px;
  color: #d92d2b;
}

@media (max-width: 1180px) {
  .recycling-container {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .recycling-copy {
    max-width: 760px;
  }
}

@media (max-width: 900px) {
  .recycling-showcase {
    grid-template-columns: 1fr;
  }

  .recycling-card {
    min-height: auto;
  }

  .recycling-card-image {
    height: 280px;
  }
}

@media (max-width: 640px) {
  .recycling-section {
    padding: 64px 0 130px;
  }

  .recycling-container {
    padding: 0 20px;
  }

  .recycling-copy h2 {
    font-size: 42px;
  }

  .recycling-copy p:not(.section-eyebrow) {
    margin-top: 24px;
    font-size: 17px;
  }

  .recycling-cta {
    width: 100%;
  }

  .recycling-card {
    padding: 22px 18px;
  }

  .recycling-card h3 {
    font-size: 22px;
  }

  .recycling-card p {
    font-size: 15px;
  }

  .recycling-card-image {
    height: 240px;
  }
}

.process-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto 32px;
  padding: 0;
  list-style: none;
}

.refill-section {
  scroll-margin-top: 104px;
  padding-top: 56px;
  padding-bottom: 150px;
}

.process-list li {
  display: grid;
  gap: 16px;
  grid-template-rows: auto auto 1fr;
  min-height: 350px;
  padding: 24px;
  color: #111;
  font-size: 19px;
  font-weight: 900;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 38px rgba(18, 20, 24, 0.06);
}

.process-list strong {
  display: block;
  color: #111;
  font-size: 20px;
  line-height: 1.25;
}

.process-list img {
  display: block;
  width: 100%;
  height: 220px;
  align-self: end;
  object-fit: contain;
  object-position: center;
  background: #f6f7f9;
  border-radius: 8px;
}

.process-list img.is-zoomable {
  cursor: zoom-in;
  transition: filter 0.2s ease, transform 0.2s ease;
}

.process-list img.is-zoomable:hover,
.process-list img.is-zoomable:focus-visible {
  filter: contrast(1.04) saturate(1.03);
  transform: translateY(-2px);
  outline: none;
}

.process-list span {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: var(--red);
  border-radius: 50%;
}

.center-btn {
  display: flex;
  width: max-content;
  margin: 0 auto;
}

.chip-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.case-grid article {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 230px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), #fff),
    repeating-linear-gradient(135deg, transparent 0 14px, rgba(20, 24, 28, 0.05) 15px);
}

.case-grid span {
  width: max-content;
  padding: 6px 12px;
  color: #fff;
  font-weight: 900;
  background: var(--black);
  border-radius: 999px;
}

.contact-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 46px;
  align-items: start;
  background:
    linear-gradient(120deg, #111 0 35%, #1f2228 36%, #fff 36.2%);
}

.contact-copy {
  color: #fff;
}

.contact-brand-row {
  display: flex;
  align-items: center;
  gap: 28px;
}

.contact-brand-block {
  display: grid;
  gap: 8px;
  max-width: 310px;
}

.contact-brand-header {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 950;
  line-height: 1.2;
}

.contact-brand-header::before {
  content: "";
  width: 4px;
  height: 22px;
  background: var(--red);
  border-radius: 999px;
}

.contact-brand-header img {
  display: block;
  width: 126px;
  height: 18px;
  object-fit: contain;
  object-position: left center;
  filter: brightness(0) invert(1);
}

.contact-brand-header small {
  display: none;
}

.contact-brand-slogan {
  display: block;
  margin: 0;
  color: #fff;
  font-size: clamp(24px, 2.2vw, 34px);
  line-height: 1.18;
  font-weight: 950;
}

.contact-brand-service {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 15px;
  line-height: 1.45;
  font-weight: 800;
}

.contact-copy h2,
.contact-copy p,
.contact-copy .eyebrow {
  color: #fff;
}

.contact-copy strong {
  display: inline-block;
  margin-top: 24px;
  color: #fff;
  font-size: 22px;
}

.contact-wechat-actions {
  display: flex;
  align-items: center;
  margin-top: 0;
}

.wechat-qr-card {
  display: grid;
  width: 172px;
  gap: 10px;
  padding: 14px;
  color: #fff;
  text-align: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 12px;
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.24);
}

.wechat-qr-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  padding: 8px;
  background: #fff;
  border-radius: 8px;
}

.wechat-qr-card span {
  font-size: 15px;
  line-height: 1.35;
  font-weight: 900;
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: #111;
  font-weight: 900;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  min-height: 46px;
  padding: 12px 14px;
  color: #111;
  font: inherit;
  background: #f8f9fb;
  border: 1px solid #dfe3e8;
  border-radius: 8px;
}

.contact-form textarea {
  resize: vertical;
}

.full {
  grid-column: 1 / -1;
}

.floating-actions {
  position: fixed;
  right: 18px;
  top: auto;
  bottom: 22px;
  z-index: 40;
  display: grid;
  gap: 8px;
}

.floating-actions a {
  display: grid;
  place-items: center;
  min-width: 76px;
  min-height: 42px;
  padding: 8px 12px;
  color: #fff;
  font-size: 14px;
  font-weight: 900;
  background: #111;
  border-radius: 8px;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.14);
}

.floating-actions a.active,
.floating-actions a:hover {
  background: var(--red);
}

@media (max-width: 1520px) {
  .site-header {
    gap: 18px;
  }

  .brand {
    min-width: 548px;
  }

  .brand-meta {
    display: grid;
  }

  .main-nav {
    gap: 16px;
    font-size: 15px;
  }

  .hero-section {
    grid-template-columns: 0.92fr 1.08fr;
  }

  .showcase-reference {
    inset: -10px -52px 0 -70px;
  }

  .showcase-reference img {
    right: -8%;
  }
}

@media (max-width: 1120px) {
  .site-header {
    flex-wrap: wrap;
    gap: 12px;
    padding-right: 32px;
  }

  .menu-toggle {
    display: block;
    margin-left: 0;
  }

  .brand {
    flex: 0 0 528px;
    min-width: 528px;
  }

  .brand-divider {
    margin-left: 6px;
    margin-right: 6px;
  }

  .brand-meta {
    display: grid;
    min-width: 235px;
  }

  .header-cta {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .main-nav {
    display: none;
    order: 4;
    width: 100%;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
  }

  .main-nav.open {
    display: grid;
  }

  .main-nav a {
    padding: 14px 8px;
    border-top: 1px solid var(--line);
  }

  .hero-section {
    grid-template-columns: 1fr;
    padding-top: 56px;
  }

  .hero-copy {
    max-width: none;
  }

  .hero-visual {
    min-height: 620px;
  }

  .showcase-reference {
    inset: 0 -22px 0 -18px;
  }

  .showcase-reference img {
    top: -14.2%;
    right: -6%;
    height: 114.2%;
  }

  .unit-grade {
    left: 40%;
  }

  .unit-standard {
    right: 6%;
  }

  .three,
  .four,
  .grade-grid,
  .case-grid,
  .chip-grid,
  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .split-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .contact-section {
    background: #111;
  }
}

@media (max-width: 900px) {
  .brand {
    flex: 0 0 410px;
    min-width: 410px;
  }

  .brand-meta {
    min-width: 150px;
  }

  .brand-meta strong {
    font-size: 16px;
  }

  .brand-meta small {
    font-size: 14px;
  }

  .site-header {
    gap: 12px;
    padding-right: 24px;
  }
}

@media (max-width: 720px) {
  .site-header {
    min-height: 76px;
    padding: 10px 16px;
  }

  .brand {
    flex: 0 1 auto;
    min-width: 0;
    gap: 10px;
  }

  .brand-cn {
    font-size: 24px;
  }

  .brand-en,
  .brand-meta,
  .brand-divider,
  .header-cta {
    display: none;
  }

  .main-nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-section {
    min-height: 0;
    padding: 44px 18px 30px;
  }

  .company-label {
    font-size: 16px;
  }

  .hero-copy h1 {
    font-size: 42px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .trust-tags {
    grid-template-columns: 1fr;
  }

  .trust-tags article {
    padding: 14px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .trust-tags article:last-child {
    border-bottom: 0;
  }

  .hero-visual {
    min-height: 430px;
    margin: 8px -18px -26px;
    overflow: hidden;
    transform: none;
  }

  .showcase-reference {
    inset: 0;
  }

  .showcase-reference img {
    top: -13.5%;
    right: -62%;
    height: 113.5%;
  }

  .showcase-reference::before {
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, rgba(255, 255, 255, 0) 12%, rgba(255, 255, 255, 0) 88%, rgba(255, 255, 255, 0.65) 100%),
      linear-gradient(90deg, rgba(255, 255, 255, 0.6), transparent 24%);
  }

  .callout,
  .sheet-right,
  .mannequin {
    display: none;
  }

  .section {
    padding: 58px 18px;
  }

  .three,
  .four,
  .grade-grid,
  .case-grid,
  .chip-grid,
  .process-list,
  .process-board,
  .contact-form {
    grid-template-columns: 1fr;
  }

  .contact-section {
    gap: 24px;
  }

  .contact-wechat-actions,
  .wechat-qr-card {
    width: 100%;
  }

  .floating-actions {
    top: auto;
    right: 10px;
    left: 10px;
    bottom: 10px;
    grid-template-columns: repeat(4, 1fr);
  }

  .floating-actions a {
    min-width: 0;
    min-height: 40px;
    padding: 6px;
    font-size: 12px;
  }
}

/* Final product supply override: keep this after all global rhythm rules. */
#products.product-section {
  min-height: calc(100svh - var(--header-offset));
  padding-top: clamp(28px, 4.2vh, 52px);
  padding-bottom: clamp(28px, 4.2vh, 52px);
  scroll-margin-top: var(--header-offset);
}

#products .section-heading {
  max-width: 920px;
  margin-bottom: 28px;
}

#products .section-heading p {
  margin-bottom: 10px;
}

#products .section-heading h2 {
  font-size: clamp(38px, 4.2vw, 62px);
  line-height: 1.08;
}

#products .grade-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 1120px;
  gap: 22px;
  margin: 0 auto;
}

#products .grade-card,
#products .grade-card.recommended {
  display: grid;
  grid-template-rows: minmax(236px, auto) 1fr;
  min-height: 540px;
  padding: 28px 28px 20px;
  border-color: rgba(17, 24, 39, 0.1);
  box-shadow: 0 22px 54px rgba(18, 20, 24, 0.075);
  transform: none;
}

#products .grade-card.recommended {
  border-color: rgba(217, 45, 43, 0.32);
  box-shadow: 0 24px 58px rgba(217, 45, 43, 0.11);
}

#products .grade-card::after {
  right: -92px;
  bottom: 54px;
  width: 250px;
  height: 250px;
  border-width: 30px;
  opacity: 0.58;
}

#products .grade-copy {
  display: flex;
  min-height: 236px;
  flex-direction: column;
}

#products .grade-card span {
  font-size: clamp(32px, 2.7vw, 42px);
  line-height: 1.05;
}

#products .grade-card h3 {
  margin: 8px 0 14px;
  font-size: clamp(25px, 2vw, 34px);
  line-height: 1.1;
}

#products .grade-label {
  width: max-content;
  min-height: 32px;
  margin-bottom: 14px;
  padding: 0 12px;
}

#products .grade-card p {
  margin: 0;
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.62;
}

#products .grade-copy small {
  margin-top: auto;
  font-size: 14px;
  line-height: 1.4;
}

#products .grade-cta {
  width: 100%;
  min-height: 44px;
  margin-top: 12px;
}

#products .grade-visual {
  display: flex;
  min-height: 260px;
  margin: 16px 0 0;
  align-items: flex-end;
  justify-content: center;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(86%, 310px);
  max-width: 86%;
  height: 252px;
  object-fit: contain;
  object-position: center bottom;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products.product-section {
    padding-top: 18px;
    padding-bottom: 22px;
  }

  #products .section-heading {
    margin-bottom: 18px;
  }

  #products .section-heading p {
    margin-bottom: 8px;
    font-size: 20px;
  }

  #products .section-heading h2 {
    font-size: clamp(36px, 4.5vw, 52px);
  }

  #products .grade-grid {
    max-width: 1100px;
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    grid-template-rows: minmax(214px, auto) 1fr;
    min-height: 500px;
    padding: 22px 22px 16px;
  }

  #products .grade-copy {
    min-height: 214px;
  }

  #products .grade-card span {
    font-size: clamp(30px, 3.3vw, 38px);
  }

  #products .grade-card h3 {
    margin: 6px 0 10px;
    font-size: clamp(24px, 2.9vw, 30px);
  }

  #products .grade-label {
    min-height: 30px;
    margin-bottom: 10px;
    padding: 0 10px;
    font-size: 13px;
  }

  #products .grade-card p {
    font-size: 15px;
    line-height: 1.52;
  }

  #products .grade-copy small {
    font-size: 13px;
  }

  #products .grade-cta {
    min-height: 38px;
    margin-top: 10px;
  }

  #products .grade-visual {
    min-height: 238px;
    margin-top: 12px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(84%, 292px);
    max-width: 84%;
    height: 232px;
  }
}

@media (max-width: 759px) {
  #products.product-section {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  #products .section-heading {
    margin-bottom: 24px;
  }

  #products .grade-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    grid-template-rows: auto auto;
    min-height: 0;
    padding: 24px 22px 20px;
  }

  #products .grade-copy {
    min-height: 0;
  }

  #products .grade-visual {
    min-height: 230px;
    margin-top: 22px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(84%, 300px);
    max-width: 84%;
    height: 230px;
  }
}

/* Final scenario section fit: show applicable scenarios as a standalone screen. */
#scenarios.scenario-section {
  min-height: calc(100svh - var(--header-offset));
  padding-top: clamp(18px, 3vh, 36px);
  padding-bottom: clamp(20px, 3vh, 36px);
  scroll-margin-top: var(--header-offset);
}

#scenarios .scenario-container {
  max-width: 1160px;
  padding: 0 32px;
}

#scenarios .section-eyebrow {
  margin-bottom: 8px;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.1;
}

#scenarios .section-title {
  max-width: 860px;
  margin-bottom: 24px;
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.12;
}

#scenarios .scenario-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

#scenarios .scenario-image {
  aspect-ratio: 2.12 / 1;
}

@media (min-width: 760px) and (max-height: 900px) {
  #scenarios.scenario-section {
    padding-top: 12px;
    padding-bottom: 18px;
  }

  #scenarios .scenario-container {
    max-width: 1120px;
    padding: 0 28px;
  }

  #scenarios .section-eyebrow {
    margin-bottom: 6px;
    font-size: 20px;
  }

  #scenarios .section-title {
    margin-bottom: 18px;
    font-size: clamp(28px, 3.5vw, 38px);
  }

  #scenarios .scenario-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  #scenarios .scenario-image {
    aspect-ratio: 2.18 / 1;
  }
}

@media (max-width: 759px) {
  #scenarios.scenario-section {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  #scenarios .scenario-container {
    padding: 0 20px;
  }

  #scenarios .section-title {
    margin-bottom: 22px;
  }

  #scenarios .scenario-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  #scenarios .scenario-image {
    aspect-ratio: 4 / 3;
  }
}

/* Final polish for the 45A product supply section only. */
#products.product-section {
  min-height: calc(100svh - var(--header-offset));
  padding-top: clamp(28px, 4.2vh, 52px);
  padding-bottom: clamp(28px, 4.2vh, 52px);
  scroll-margin-top: var(--header-offset);
}

#products .section-heading {
  max-width: 920px;
  margin-bottom: 28px;
}

#products .section-heading p {
  margin-bottom: 10px;
}

#products .section-heading h2 {
  font-size: clamp(38px, 4.2vw, 62px);
  line-height: 1.08;
}

#products .grade-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 1120px;
  gap: 22px;
  margin: 0 auto;
}

#products .grade-card,
#products .grade-card.recommended {
  display: grid;
  grid-template-rows: minmax(236px, auto) 1fr;
  min-height: 540px;
  padding: 28px 28px 20px;
  border-color: rgba(17, 24, 39, 0.1);
  box-shadow: 0 22px 54px rgba(18, 20, 24, 0.075);
  transform: none;
}

#products .grade-card.recommended {
  border-color: rgba(217, 45, 43, 0.32);
  box-shadow: 0 24px 58px rgba(217, 45, 43, 0.11);
}

#products .grade-card::after {
  right: -92px;
  bottom: 54px;
  width: 250px;
  height: 250px;
  border-width: 30px;
  opacity: 0.58;
}

#products .grade-copy {
  display: flex;
  min-height: 236px;
  flex-direction: column;
}

#products .grade-card span {
  font-size: clamp(32px, 2.7vw, 42px);
  line-height: 1.05;
}

#products .grade-card h3 {
  margin: 8px 0 14px;
  font-size: clamp(25px, 2vw, 34px);
  line-height: 1.1;
}

#products .grade-label {
  width: max-content;
  min-height: 32px;
  margin-bottom: 14px;
  padding: 0 12px;
}

#products .grade-card p {
  margin: 0;
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.62;
}

#products .grade-copy small {
  margin-top: auto;
  font-size: 14px;
  line-height: 1.4;
}

#products .grade-cta {
  width: 100%;
  min-height: 44px;
  margin-top: 12px;
}

#products .grade-visual {
  display: flex;
  min-height: 260px;
  margin: 16px 0 0;
  align-items: flex-end;
  justify-content: center;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(86%, 310px);
  max-width: 86%;
  height: 252px;
  object-fit: contain;
  object-position: center bottom;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products.product-section {
    padding-top: 18px;
    padding-bottom: 22px;
  }

  #products .section-heading {
    margin-bottom: 18px;
  }

  #products .section-heading p {
    margin-bottom: 8px;
    font-size: 20px;
  }

  #products .section-heading h2 {
    font-size: clamp(36px, 4.5vw, 52px);
  }

  #products .grade-grid {
    max-width: 1100px;
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    grid-template-rows: minmax(214px, auto) 1fr;
    min-height: 500px;
    padding: 22px 22px 16px;
  }

  #products .grade-copy {
    min-height: 214px;
  }

  #products .grade-card span {
    font-size: clamp(30px, 3.3vw, 38px);
  }

  #products .grade-card h3 {
    margin: 6px 0 10px;
    font-size: clamp(24px, 2.9vw, 30px);
  }

  #products .grade-label {
    min-height: 30px;
    margin-bottom: 10px;
    padding: 0 10px;
    font-size: 13px;
  }

  #products .grade-card p {
    font-size: 15px;
    line-height: 1.52;
  }

  #products .grade-copy small {
    font-size: 13px;
  }

  #products .grade-cta {
    min-height: 38px;
    margin-top: 10px;
  }

  #products .grade-visual {
    min-height: 238px;
    margin-top: 12px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(84%, 292px);
    max-width: 84%;
    height: 232px;
  }
}

@media (max-width: 759px) {
  #products.product-section {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  #products .section-heading {
    margin-bottom: 24px;
  }

  #products .grade-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    grid-template-rows: auto auto;
    min-height: 0;
    padding: 24px 22px 20px;
  }

  #products .grade-copy {
    min-height: 0;
  }

  #products .grade-visual {
    min-height: 230px;
    margin-top: 22px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(84%, 300px);
    max-width: 84%;
    height: 230px;
  }
}

/* Hero layout correction: keep the product image fully visible and centered. */
:root {
  --brand-red: #d92d2b;
  --brand-dark: #0f1115;
  --text-gray: #5f6673;
  --light-bg: #f7f7f7;
}

.site-header {
  min-height: 96px;
}

.hero-section {
  position: relative;
  display: block;
  width: 100%;
  min-height: max(760px, calc(100vh - 96px));
  height: auto;
  overflow: hidden;
  padding: 0;
  background:
    radial-gradient(circle at 70% 45%, rgba(217, 45, 43, 0.06), transparent 34%),
    linear-gradient(90deg, #ffffff 0%, #ffffff 42%, #f8f8f8 100%);
}

.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(0, 0, 0, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.55;
  pointer-events: none;
}

.hero-section::after {
  display: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 0.44fr) minmax(0, 0.56fr);
  align-items: center;
  column-gap: 28px;
  max-width: 1480px;
  min-height: max(760px, calc(100vh - 96px));
  margin: 0 auto;
  padding: 72px 64px 56px;
}

.hero-copy {
  position: relative;
  z-index: 5;
  align-self: center;
  max-width: 650px;
  padding-top: 10px;
}

.company-badge {
  display: inline-flex;
  align-items: center;
  margin-bottom: 38px;
  padding: 12px 22px;
  color: #ffffff;
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
  background: var(--brand-red);
  border-radius: 8px;
  box-shadow: 0 16px 36px rgba(217, 45, 43, 0.22);
}

.hero-title {
  margin: 0;
  color: var(--brand-dark);
  font-size: clamp(52px, 4.2vw, 72px);
  font-weight: 950;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-title span {
  display: block;
  white-space: nowrap;
}

.hero-title strong,
.hero-title em {
  color: var(--brand-red);
  font-style: normal;
  font-weight: 950;
}

.hero-desc {
  max-width: 640px;
  margin: 34px 0 0;
  color: #556070;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  color: inherit;
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.22s ease;
}

.btn-primary {
  color: #ffffff;
  background: var(--brand-red);
  border: 1px solid var(--brand-red);
  box-shadow: 0 12px 28px rgba(217, 45, 43, 0.18);
}

.btn-outline {
  color: var(--brand-red);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(217, 45, 43, 0.32);
}

.btn:hover {
  transform: translateY(-2px);
}

.hero-trust {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  max-width: 560px;
  margin-top: 38px;
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(217, 45, 43, 0.08);
  border-radius: 18px;
  box-shadow: 0 18px 45px rgba(15, 17, 21, 0.05);
  backdrop-filter: blur(10px);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px;
  border-right: 1px solid rgba(217, 45, 43, 0.14);
}

.trust-item:last-child {
  border-right: none;
}

.trust-icon {
  display: flex;
  flex: 0 0 42px;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  color: var(--brand-red);
  font-size: 13px;
  font-weight: 900;
  border: 2px solid var(--brand-red);
  border-radius: 999px;
}

.trust-item strong {
  display: block;
  color: #15171c;
  font-size: 20px;
  font-weight: 900;
  line-height: 1.1;
}

.trust-item span {
  display: block;
  margin-top: 5px;
  color: #656d7a;
  font-size: 14px;
  font-weight: 600;
}

.hero-visual {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: min(680px, calc(100vh - 150px));
  min-height: 580px;
  overflow: visible;
}

.hero-product-image {
  display: block;
  width: 100%;
  max-width: 920px;
  height: auto;
  max-height: 680px;
  object-fit: contain;
  object-position: center center;
  transform: none;
  filter: drop-shadow(0 34px 80px rgba(15, 17, 21, 0.08));
}

@media (min-width: 1280px) {
  .hero-inner {
    padding-right: 54px;
    padding-left: 70px;
  }

  .hero-product-image {
    max-width: 940px;
    max-height: 700px;
  }
}

@media (max-width: 1280px) {
  .hero-inner {
    grid-template-columns: minmax(0, 0.46fr) minmax(0, 0.54fr);
    column-gap: 18px;
    padding: 60px 42px 44px;
  }

  .hero-title {
    font-size: clamp(50px, 5.1vw, 76px);
  }

  .hero-desc {
    font-size: 18px;
  }

  .hero-visual {
    height: 600px;
    min-height: 520px;
  }

  .hero-product-image {
    max-width: 800px;
    max-height: 600px;
  }
}

@media (max-width: 980px) {
  .hero-section,
  .hero-inner {
    min-height: 0;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    padding: 48px 28px 36px;
  }

  .hero-copy {
    max-width: 100%;
  }

  .hero-title span {
    white-space: normal;
  }

  .hero-visual {
    height: auto;
    min-height: 0;
    margin-top: 28px;
  }

  .hero-product-image {
    width: 100%;
    height: auto;
    max-width: 100%;
    max-height: none;
    transform: none;
  }
}

@media (max-width: 640px) {
  .hero-inner {
    padding: 34px 18px 28px;
  }

  .company-badge {
    margin-bottom: 22px;
    padding: 10px 14px;
    font-size: 16px;
  }

  .hero-title {
    font-size: 42px;
    line-height: 1.12;
  }

  .hero-title span {
    white-space: normal;
  }

  .hero-desc {
    font-size: 16px;
    line-height: 1.75;
  }

  .hero-actions {
    gap: 10px;
  }

  .btn {
    width: 100%;
    min-height: 46px;
  }

  .hero-trust {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 16px;
  }

  .trust-item {
    padding: 0 0 14px;
    border-right: none;
    border-bottom: 1px solid rgba(217, 45, 43, 0.12);
  }

  .trust-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
  }
}

/* Hero headline sizing correction. */
.hero-inner {
  grid-template-columns: 42% 58%;
  column-gap: 36px;
}

.hero-copy {
  position: relative;
  z-index: 5;
  max-width: 620px;
}

.hero-title {
  margin: 0;
  color: #111111;
  font-size: clamp(52px, 4.2vw, 72px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-title span {
  display: block;
  color: #111111;
  white-space: nowrap;
}

.hero-title em {
  color: #d92d2b;
  font-style: normal;
  font-weight: 950;
}

.hero-title strong {
  color: inherit;
}

@media (max-width: 1440px) {
  .hero-title {
    font-size: clamp(46px, 3.8vw, 64px);
    line-height: 1.12;
  }

  .hero-copy {
    max-width: 560px;
  }

  .hero-inner {
    grid-template-columns: 40% 60%;
    column-gap: 28px;
  }
}

@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: clamp(42px, 8vw, 58px);
  }

  .hero-title span {
    white-space: normal;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 38px;
    line-height: 1.16;
    letter-spacing: 0;
  }
}

/* Hero compactness and visual blending pass. */
.hero-section {
  min-height: max(700px, calc(100vh - 96px));
}

.hero-inner {
  min-height: max(700px, calc(100vh - 96px));
  padding-top: 42px;
  padding-bottom: 34px;
}

.company-badge {
  margin-bottom: 26px;
}

.hero-desc {
  margin-top: 24px;
}

.hero-actions {
  margin-top: 24px;
}

.hero-trust {
  margin-top: 26px;
}

.hero-visual {
  position: relative;
  height: min(640px, calc(100vh - 170px));
  min-height: 540px;
  overflow: visible;
  isolation: isolate;
}

.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
}

.hero-visual::before {
  background:
    linear-gradient(180deg, #ffffff 0%, rgba(255, 255, 255, 0.86) 2.4%, rgba(255, 255, 255, 0) 10%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.92) 0%, rgba(255, 255, 255, 0.44) 7%, rgba(255, 255, 255, 0) 18%);
}

.hero-visual::after {
  background:
    linear-gradient(90deg, transparent 78%, rgba(248, 248, 248, 0.58) 94%, #f8f8f8 100%),
    linear-gradient(180deg, transparent 88%, rgba(255, 255, 255, 0.52) 100%);
}

.hero-product-image {
  position: relative;
  z-index: 2;
  max-width: 900px;
  max-height: 640px;
  image-rendering: auto;
  filter: contrast(1.08) saturate(1.045) drop-shadow(0 24px 54px rgba(15, 17, 21, 0.07));
}

@media (min-width: 1280px) {
  .hero-inner {
    padding-top: 44px;
    padding-bottom: 34px;
  }

  .hero-product-image {
    max-width: 920px;
    max-height: 660px;
  }
}

@media (max-width: 1280px) {
  .hero-section,
  .hero-inner {
    min-height: max(660px, calc(100vh - 96px));
  }

  .hero-inner {
    padding-top: 38px;
    padding-bottom: 30px;
  }

  .hero-visual {
    height: 560px;
    min-height: 500px;
  }

  .hero-product-image {
    max-width: 780px;
    max-height: 560px;
  }
}

@media (max-width: 980px) {
  .hero-section,
  .hero-inner {
    min-height: max(760px, calc(100vh - 96px));
  }

  .hero-inner {
    padding-top: 36px;
    padding-bottom: 120px;
  }

  .hero-visual {
    height: auto;
    min-height: 0;
  }

  .hero-visual::before,
  .hero-visual::after {
    display: none;
  }
}

/* Service promise strip refinement. */
.hero-trust {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: center;
  gap: 0;
  width: min(100%, 600px);
  max-width: 600px;
  min-height: 70px;
  margin-top: 28px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(20, 24, 28, 0.04);
  border-radius: 4px;
  box-shadow: none;
  backdrop-filter: blur(8px);
}

.trust-item {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 13px;
  min-width: 0;
  padding: 0 22px;
  border-right: 1px solid rgba(20, 24, 28, 0.1);
}

.trust-item:last-child {
  border-right: none;
}

.trust-icon {
  display: flex;
  flex: 0 0 44px;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: #df0d14;
  line-height: 1;
  background: rgba(255, 255, 255, 0.42);
  border: 1.5px solid rgba(223, 13, 20, 0.95);
  border-radius: 50%;
}

.trust-icon svg {
  width: 25px;
  height: 25px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.trust-item strong {
  display: block;
  color: #111318;
  font-size: 20px;
  font-weight: 900;
  line-height: 1.1;
}

.trust-item span {
  display: block;
  margin-top: 5px;
  color: #596270;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.1;
}

@media (max-width: 980px) {
  .hero-trust {
    width: 100%;
    max-width: 640px;
  }
}

@media (max-width: 640px) {
  .hero-trust {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 16px;
  }

  .trust-item {
    justify-content: flex-start;
    padding: 12px 0;
    border-right: none;
    border-bottom: 1px solid rgba(223, 13, 20, 0.12);
  }

  .trust-item:first-child {
    padding-top: 0;
  }

  .trust-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
  }
}

/* Final header layout pass: compact brand, earlier nav, horizontal CTA. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: block;
  width: 100%;
  height: 96px;
  min-height: 96px;
  padding: 0;
  background: #ffffff;
  border-bottom: 1px solid rgba(15, 17, 21, 0.08);
}

.site-header-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 22px;
  width: 100%;
  height: 96px;
  margin: 0;
  padding: 0 28px;
}

.brand {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.mascot {
  flex: 0 0 68px;
  width: 68px;
  height: 68px;
}

.mascot img {
  width: 72px;
  height: 68px;
}

.brand-title {
  gap: 3px;
}

.brand-cn {
  font-size: 31px;
}

.brand-en {
  width: 174px;
  height: 17px;
}

.brand-divider {
  flex: 0 0 1px;
  width: 1px;
  height: 48px;
  margin: 0 4px 0 8px;
  background: rgba(15, 17, 21, 0.18);
}

.brand-meta {
  display: grid;
  flex: 0 0 auto;
  gap: 4px;
  min-width: 0;
}

.brand-meta strong {
  color: #111111;
  font-size: 18px;
  font-weight: 900;
  line-height: 1.1;
  white-space: nowrap;
}

.brand-meta small {
  color: #6b7280;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.1;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 22px;
  min-width: 0;
  overflow: visible;
  font-size: 16px;
}

.main-nav a {
  flex-shrink: 0;
  padding: 18px 0;
  color: #111111;
  font-size: inherit;
  font-weight: 800;
  white-space: nowrap;
}

.main-nav a.active {
  color: #111111;
}

.main-nav a:hover {
  color: #d92d2b;
}

.header-cta {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-width: 124px;
  height: 48px;
  min-height: 48px;
  padding: 0 22px;
  color: #ffffff;
  font-size: 17px;
  font-weight: 900;
  line-height: 1;
  white-space: nowrap;
  word-break: keep-all;
  writing-mode: horizontal-tb;
  background: #d92d2b;
  border-radius: 10px;
  box-shadow: 0 10px 28px rgba(217, 45, 43, 0.18);
}

.menu-toggle {
  justify-self: start;
}

@media (max-width: 1440px) {
  .site-header-inner {
    column-gap: 18px;
    padding: 0 22px;
  }

  .mascot {
    flex-basis: 60px;
    width: 60px;
    height: 60px;
  }

  .mascot img {
    width: 64px;
    height: 60px;
  }

  .brand-cn {
    font-size: 28px;
  }

  .brand-en {
    width: 158px;
    height: 16px;
  }

  .brand-meta strong {
    font-size: 17px;
  }

  .brand-meta small {
    font-size: 13px;
  }

  .main-nav {
    gap: 16px;
    font-size: 15px;
  }

  .header-cta {
    min-width: 112px;
    height: 44px;
    min-height: 44px;
    padding: 0 18px;
    font-size: 16px;
  }
}

@media (max-width: 1280px) {
  .site-header-inner {
    column-gap: 14px;
    padding: 0 18px;
  }

  .brand {
    gap: 4px;
  }

  .brand-en {
    width: 132px;
  }

  .brand-divider {
    height: 42px;
    margin: 0;
  }

  .brand-meta strong {
    font-size: 15px;
  }

  .brand-meta small {
    font-size: 12px;
  }

  .main-nav {
    gap: 12px;
    font-size: 14px;
  }

  .header-cta {
    min-width: 104px;
    height: 42px;
    min-height: 42px;
    padding: 0 16px;
    font-size: 15px;
  }
}

@media (max-width: 1100px) {
  .site-header-inner {
    grid-template-columns: auto auto auto;
    justify-content: start;
    column-gap: 14px;
    padding: 0 20px;
  }

  .main-nav {
    display: none;
    grid-column: 1 / -1;
    width: 100%;
  }

  .main-nav.open {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    order: initial;
  }

  .menu-toggle {
    display: block;
    margin-left: 0;
  }

  .header-cta {
    display: inline-flex;
    min-width: 112px;
    white-space: nowrap;
    word-break: keep-all;
  }
}

@media (max-width: 900px) {
  .site-header-inner {
    column-gap: 12px;
    padding: 0 16px;
  }

  .mascot {
    flex-basis: 52px;
    width: 52px;
    height: 52px;
  }

  .mascot img {
    width: 56px;
    height: 52px;
  }

  .brand-cn {
    font-size: 26px;
  }

  .brand-en {
    width: 122px;
    height: 15px;
  }

  .brand-divider {
    height: 38px;
    margin: 0;
  }

  .brand-meta strong {
    font-size: 14px;
  }

  .brand-meta small {
    font-size: 11px;
  }

  .header-cta {
    min-width: 104px;
    padding: 0 14px;
    font-size: 15px;
  }
}

@media (max-width: 720px) {
  .site-header {
    height: 76px;
    min-height: 76px;
  }

  .site-header-inner {
    height: 76px;
    grid-template-columns: auto auto auto;
    column-gap: 10px;
    padding: 0 12px;
  }

  .brand-meta,
  .brand-divider {
    display: none;
  }

  .brand-cn {
    font-size: 24px;
  }

  .brand-en {
    display: block;
    width: 138px;
    height: 14px;
  }

  .header-cta {
    display: inline-flex;
    min-width: 96px;
    height: 40px;
    min-height: 40px;
    padding: 0 12px;
    font-size: 14px;
  }
}

/* Product supply section: three cartridge grades with box + cartridge visuals. */
.product-section {
  background: #fff;
  padding-top: 96px;
  padding-bottom: 104px;
}

.product-section .section-heading {
  max-width: 980px;
  margin-bottom: 48px;
}

.product-section .section-heading p {
  margin: 0 0 16px;
  color: #d92d2b;
  font-size: 19px;
  line-height: 1;
  font-weight: 950;
}

.product-section .section-heading h2 {
  margin: 0;
  color: #111;
  font-size: clamp(30px, 3vw, 48px);
  line-height: 1.2;
  font-weight: 950;
  letter-spacing: 0;
}

.product-section .grade-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(22px, 2.2vw, 34px);
  align-items: stretch;
  max-width: 1580px;
  margin: 0 auto;
}

.product-section .grade-card {
  position: relative;
  display: flex;
  min-height: 580px;
  padding: 40px 38px 30px;
  overflow: hidden;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(145deg, #fff 0%, #fff 62%, #fbfbfb 100%);
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  box-shadow: 0 20px 52px rgba(17, 17, 17, 0.07);
}

.product-section .grade-card::after {
  content: "";
  position: absolute;
  right: -84px;
  bottom: 92px;
  width: 250px;
  height: 250px;
  border: 34px solid rgba(217, 45, 43, 0.08);
  border-radius: 50%;
  pointer-events: none;
}

.product-section .grade-card.recommended {
  z-index: 2;
  border-color: rgba(217, 45, 43, 0.42);
  box-shadow: 0 26px 70px rgba(217, 45, 43, 0.14);
  transform: translateY(-8px);
}

.product-section .grade-card.recommended::after {
  border-color: rgba(217, 45, 43, 0.1);
}

.product-section .grade-copy {
  position: relative;
  z-index: 2;
}

.product-section .grade-card span {
  display: block;
  color: #d92d2b;
  font-size: clamp(30px, 2.5vw, 42px);
  line-height: 1.05;
  font-weight: 950;
  letter-spacing: 0;
}

.product-section .grade-card h3 {
  margin: 8px 0 20px;
  color: #111;
  font-size: clamp(25px, 2vw, 34px);
  line-height: 1.12;
  font-weight: 950;
}

.product-section .grade-card p {
  max-width: 450px;
  margin: 0;
  color: #667085;
  font-size: clamp(16px, 1.2vw, 20px);
  line-height: 1.72;
}

.product-section .grade-visual {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 318px;
  margin: 18px -18px 0;
}

.product-section .grade-visual img {
  display: block;
  width: min(112%, 560px);
  max-height: 330px;
  object-fit: contain;
  object-position: center bottom;
  filter: saturate(1.04) contrast(1.03);
}

.product-section .recommended .grade-visual img {
  width: min(116%, 590px);
  max-height: 348px;
}

@media (max-width: 1180px) {
  .product-section .grade-grid {
    grid-template-columns: 1fr;
    max-width: 720px;
  }

  .product-section .grade-card,
  .product-section .grade-card.recommended {
    min-height: 520px;
    transform: none;
  }

  .product-section .grade-visual img,
  .product-section .recommended .grade-visual img {
    width: min(100%, 560px);
    max-height: 330px;
  }
}

@media (max-width: 640px) {
  .product-section {
    padding-top: 70px;
    padding-bottom: 76px;
  }

  .product-section .section-heading {
    margin-bottom: 30px;
  }

  .product-section .section-heading p {
    font-size: 16px;
  }

  .product-section .section-heading h2 {
    font-size: clamp(30px, 3vw, 48px);
    line-height: 1.2;
  }

  .product-section .grade-card {
    min-height: 470px;
    padding: 30px 24px 22px;
  }

  .product-section .grade-card p {
    font-size: 16px;
  }

  .product-section .grade-visual {
    min-height: 250px;
    margin: 16px -14px 0;
  }

  .product-section .grade-visual img,
  .product-section .recommended .grade-visual img {
    width: 108%;
    max-height: 270px;
  }
}

/* Product supply final viewport pass: keep product images visible in the card area. */
@media (min-width: 901px) and (max-width: 1180px) {
  .product-section .grade-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-width: none;
    gap: 16px;
  }

  .product-section .grade-card,
  .product-section .grade-card.recommended {
    min-height: 500px;
    padding: 30px 22px 24px;
    transform: none;
  }

  .product-section .grade-card span {
    font-size: 30px;
  }

  .product-section .grade-card h3 {
    margin-bottom: 14px;
    font-size: 25px;
  }

  .product-section .grade-card p {
    font-size: 15px;
    line-height: 1.65;
  }

  .product-section .grade-visual {
    display: flex;
    min-height: 250px;
    margin: 16px -18px 0;
  }

  .product-section .grade-visual img,
  .product-section .recommended .grade-visual img {
    width: 112%;
    max-width: none;
    max-height: 260px;
  }
}

.product-section .grade-visual,
.product-section .grade-visual img {
  visibility: visible;
  opacity: 1;
}

/* Match key business/module labels to the company badge size and color. */
#services .section-heading p,
#services .service-card h3,
#products .section-heading p,
#recycling .section-eyebrow,
#refill .section-heading p,
#models .section-eyebrow,
#tutorials .section-heading p {
  color: var(--red);
  font-size: 24px;
  line-height: 1.2;
}

@media (max-width: 980px) {
  #home.hero-section,
  #home .hero-inner {
    min-height: max(820px, calc(100vh + 18px));
  }

  #home .hero-inner {
    padding-top: 96px;
    padding-bottom: 90px;
  }

  #home .hero-visual {
    margin-top: 46px;
  }
}

@media (min-width: 981px) {
  #home.hero-section,
  #home .hero-inner {
    min-height: max(820px, calc(100vh + 40px));
  }

  #home .hero-inner {
    padding-bottom: 70px;
  }
}

#models .section-eyebrow {
  font-size: 22px;
}

#home .hero-trust {
  display: none;
}

/* Single-screen positioning for scenario and tutorial sections. */
#models,
#tutorials {
  min-height: max(760px, calc(100vh - 96px));
  scroll-margin-top: 104px;
}

#models {
  scroll-margin-top: 150px;
  padding-top: 24px;
  padding-bottom: 110px;
}

#tutorials {
  padding-top: 46px;
  padding-bottom: 70px;
}

#tutorials .section-heading {
  margin-bottom: 22px;
}

#tutorials .section-heading h2 {
  font-size: clamp(28px, 2.5vw, 40px);
}

#tutorials .tutorial-grid {
  gap: 14px;
}

#tutorials .tutorial-card img {
  aspect-ratio: 4 / 3;
  object-fit: contain;
}

#tutorials .tutorial-card div {
  padding: 14px 16px 16px;
}

#tutorials .tutorial-card h3 {
  font-size: 20px;
}

#tutorials .tutorial-card p {
  font-size: 14px;
  line-height: 1.55;
}

@media (min-width: 800px) and (max-width: 980px) {
  #home.hero-section,
  #home .hero-inner {
    min-height: calc(100vh - 96px);
  }

  #home .hero-inner {
    grid-template-columns: minmax(0, 0.45fr) minmax(0, 0.55fr);
    column-gap: 18px;
    padding: 34px 28px 36px;
  }

  #home .hero-copy {
    max-width: 100%;
  }

  #home .company-badge {
    margin-bottom: 18px;
    padding: 10px 16px;
    font-size: 18px;
  }

  #home .hero-title {
    font-size: clamp(36px, 5vw, 48px);
    line-height: 1.1;
  }

  #home .hero-desc {
    margin-top: 18px;
    font-size: 17px;
    line-height: 1.7;
  }

  #home .hero-actions {
    margin-top: 20px;
  }

  #home .hero-actions .btn {
    min-height: 42px;
    padding: 0 16px;
    font-size: 15px;
  }

  #home .hero-visual {
    height: calc(100vh - 170px);
    min-height: 470px;
    margin-top: 0;
  }

  #home .hero-product-image {
    max-width: 100%;
    max-height: calc(100vh - 190px);
    object-fit: contain;
  }
}

@media (min-width: 800px) and (max-width: 1180px) {
  #models {
    min-height: calc(100vh - 96px);
    scroll-margin-top: 112px;
    padding-top: 22px;
    padding-bottom: 38px;
  }

  #models .scenario-container {
    max-width: 1120px;
    padding: 0 34px;
  }

  #models .section-eyebrow {
    margin-bottom: 6px;
    font-size: 20px;
  }

  #models .section-title {
    margin-bottom: 18px;
    font-size: clamp(26px, 3vw, 36px);
  }

  #models .scenario-grid {
    gap: 18px;
  }

  #models .scenario-image {
    aspect-ratio: 2.15 / 1;
  }

  #models .scenario-content {
    padding: 10px 14px 12px;
  }

  #models .scenario-content h3 {
    font-size: 19px;
  }

  #models .scenario-content p {
    font-size: 12px;
    line-height: 1.42;
  }
}

/* One-page scroll structure: preserve existing visuals while making each module a viewport section. */
:root {
  --header-offset: 104px;
}

html {
  scroll-padding-top: var(--header-offset);
}

body {
  overflow-x: hidden;
}

main,
main > section[id] {
  width: 100%;
  max-width: 100%;
}

main > section[id] {
  min-height: max(720px, calc(100vh - var(--header-offset)));
  scroll-margin-top: var(--header-offset);
}

#home {
  min-height: max(720px, calc(100vh - var(--header-offset)));
  scroll-margin-top: var(--header-offset);
}

#products,
#recycling,
#oem,
#scenarios,
#guide,
#contact {
  min-height: max(760px, calc(100vh - var(--header-offset)));
  scroll-margin-top: var(--header-offset);
}

#oem .section-heading p,
#scenarios .section-eyebrow,
#guide .section-heading p {
  color: var(--red);
  font-size: 24px;
  line-height: 1.2;
}

#scenarios .section-eyebrow {
  font-size: 22px;
}

#scenarios,
#guide {
  min-height: max(760px, calc(100vh - var(--header-offset)));
}

#scenarios {
  padding-top: 24px;
  padding-bottom: 110px;
}

#guide {
  padding-top: 46px;
  padding-bottom: 70px;
}

#guide .section-heading {
  margin-bottom: 22px;
}

#guide .section-heading h2 {
  font-size: clamp(28px, 2.5vw, 40px);
}

#guide .tutorial-grid {
  gap: 14px;
}

#guide .tutorial-card img {
  aspect-ratio: 4 / 3;
  object-fit: contain;
}

#guide .tutorial-card div {
  padding: 14px 16px 16px;
}

#guide .tutorial-card h3 {
  font-size: 20px;
}

#guide .tutorial-card p {
  font-size: 14px;
  line-height: 1.55;
}

main > section[id] {
  transition: box-shadow 240ms ease, background-color 240ms ease;
}

@media (min-width: 800px) and (max-width: 1180px) {
  #scenarios {
    min-height: calc(100vh - var(--header-offset));
    padding-top: 22px;
    padding-bottom: 38px;
  }

  #scenarios .scenario-container {
    max-width: 1120px;
    padding: 0 34px;
  }

  #scenarios .section-eyebrow {
    margin-bottom: 6px;
    font-size: 20px;
  }

  #scenarios .section-title {
    margin-bottom: 18px;
    font-size: clamp(26px, 3vw, 36px);
  }

  #scenarios .scenario-grid {
    gap: 18px;
  }

  #scenarios .scenario-image {
    aspect-ratio: 2.15 / 1;
  }

  #scenarios .scenario-content {
    padding: 10px 14px 12px;
  }

  #scenarios .scenario-content h3 {
    font-size: 19px;
  }

  #scenarios .scenario-content p {
    font-size: 12px;
    line-height: 1.42;
  }
}

@media (max-width: 720px) {
  :root {
    --header-offset: 84px;
  }

  main > section[id],
  #products,
  #recycling,
  #oem,
  #scenarios,
  #guide,
  #contact {
    min-height: auto;
  }
}

#products.product-section {
  scroll-margin-top: 96px;
  padding-top: 56px;
  padding-bottom: 150px;
}

#products .section-heading {
  margin-bottom: 34px;
}

/* B2B lead-generation upgrade layer. */
#home .hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 680px;
  margin-top: 26px;
}

#home .hero-trust span {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  color: #17191d;
  font-size: 14px;
  font-weight: 900;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(223, 13, 20, 0.18);
  border-radius: 8px;
  box-shadow: 0 10px 26px rgba(18, 20, 24, 0.06);
}

#services.service-section {
  background:
    linear-gradient(180deg, #f7f8fa 0%, #fff 100%);
  padding-top: 78px;
  padding-bottom: 92px;
}

.six {
  grid-template-columns: repeat(6, 1fr);
}

.why-grid {
  max-width: 1560px;
  margin: 0 auto;
}

#services .service-card {
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 220px;
  padding: 26px 22px;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease;
}

#services .service-card:hover,
.product-section .grade-card:hover,
.scenario-card:hover,
.tutorial-card:hover,
.recycling-card:hover,
.process-list li:hover {
  transform: translateY(-4px);
  border-color: rgba(223, 13, 20, 0.22);
  box-shadow: 0 24px 58px rgba(18, 20, 24, 0.1);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: #fff;
  font-size: 14px;
  font-weight: 950;
  background: var(--black);
  border-radius: 8px;
}

#services .service-card h3 {
  margin: 4px 0 0;
  font-size: 21px;
  line-height: 1.25;
}

#services .service-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
}

.product-section .grade-copy small {
  display: block;
  margin-top: 14px;
  color: #4f5661;
  font-size: 14px;
  font-weight: 800;
}

.grade-label {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  margin: 0 0 14px;
  padding: 0 10px;
  color: var(--red-dark);
  font-size: 14px;
  line-height: 1;
  background: #fff2f2;
  border: 1px solid rgba(223, 13, 20, 0.2);
  border-radius: 8px;
}

.product-section .grade-cta {
  width: max-content;
  min-height: 42px;
  margin-top: 18px;
  padding: 0 18px;
  font-size: 14px;
}

.process-list li {
  grid-template-rows: auto auto auto 1fr;
  min-height: 430px;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease;
}

.process-list li p {
  margin: -4px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
  font-weight: 500;
}

#guide .tutorial-card a {
  display: inline-flex;
  width: max-content;
  margin-top: 10px;
  color: var(--red);
  font-size: 14px;
  font-weight: 900;
}

.contact-details {
  display: grid;
  gap: 8px;
  max-width: 560px;
  margin-top: 22px;
}

.contact-details p {
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 16px;
  line-height: 1.55;
}

.contact-details strong {
  margin: 0;
  font-size: inherit;
}

.form-note {
  min-height: 20px;
  margin: -4px 0 0;
  color: var(--red-dark);
  font-size: 14px;
  font-weight: 800;
}

.site-footer {
  padding: 58px clamp(24px, 5vw, 96px) 24px;
  color: #dfe3e8;
  background: #0f1115;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr repeat(3, 1fr);
  gap: 34px;
  max-width: 1560px;
  margin: 0 auto;
}

.site-footer h2,
.site-footer h3 {
  margin: 0 0 16px;
  color: #fff;
  line-height: 1.2;
}

.site-footer h2 {
  font-size: 30px;
  font-weight: 950;
}

.footer-brand-block {
  display: grid;
  align-content: start;
  gap: 8px;
}

.footer-brand-block h2 {
  margin-bottom: 2px;
}

.footer-brand-block h2 span {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.06em;
}

.footer-brand-block strong {
  color: #fff;
  font-size: 22px;
  line-height: 1.25;
  font-weight: 950;
}

.footer-brand-block p {
  margin: 0;
  color: #9aa3af;
  font-size: 14px;
  line-height: 1.45;
  font-weight: 800;
}

.site-footer h3 {
  font-size: 18px;
  font-weight: 900;
}

.site-footer p,
.site-footer a {
  display: block;
  margin: 0 0 10px;
  color: #aeb6c2;
  font-size: 15px;
  line-height: 1.6;
}

.site-footer a:hover {
  color: #fff;
}

.footer-bottom {
  max-width: 1560px;
  margin: 34px auto 0;
  padding-top: 18px;
  color: #8f98a6;
  font-size: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1280px) {
  .six {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 980px) {
  .six {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-section .grade-cta {
    width: 100%;
  }
}

@media (max-width: 720px) {
  #home .hero-trust {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  #home .hero-trust span {
    justify-content: center;
  }

  .six,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  #services.service-section {
    padding-top: 58px;
    padding-bottom: 64px;
  }

  .process-list li {
    min-height: 0;
  }

  .site-footer {
    padding-bottom: 86px;
  }
}

/* Keep the product supply module self-contained on tablet and narrow desktop viewports. */
@media (min-width: 760px) and (max-width: 980px) {
  #products.product-section {
    min-height: calc(100vh - var(--header-offset));
    scroll-margin-top: 84px;
    padding-top: 22px;
    padding-bottom: 48px;
  }

  #products .section-heading {
    margin-bottom: 20px;
  }

  #products .section-heading p {
    margin-bottom: 10px;
    font-size: 20px;
  }

  #products .section-heading h2 {
    font-size: clamp(30px, 4.6vw, 38px);
    line-height: 1.12;
  }

  #products .grade-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    max-width: none;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    min-height: 440px;
    padding: 22px 16px 18px;
    transform: none;
  }

  #products .grade-card span {
    font-size: 28px;
  }

  #products .grade-card h3 {
    margin: 6px 0 10px;
    font-size: 24px;
  }

  #products .grade-label {
    min-height: 28px;
    margin-bottom: 10px;
    padding: 0 8px;
    font-size: 13px;
  }

  #products .grade-card p {
    font-size: 14px;
    line-height: 1.45;
  }

  #products .grade-copy small {
    margin-top: 8px;
    font-size: 12px;
  }

  #products .grade-cta {
    width: 100%;
    min-height: 36px;
    margin-top: 10px;
    padding: 0 10px;
    font-size: 13px;
  }

  #products .grade-visual {
    min-height: 160px;
    margin: 12px -10px 0;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: 112%;
    max-width: none;
    max-height: 170px;
  }

  #products .grade-card::after {
    right: -96px;
    bottom: 36px;
    width: 210px;
    height: 210px;
  }
}

/* Final section rhythm pass: keep visuals, align every anchored module below the sticky header. */
:root {
  --header-offset: 96px;
  --section-y: clamp(86px, 8vh, 108px);
  --section-y-compact: clamp(64px, 7vh, 86px);
}

html {
  scroll-padding-top: var(--header-offset);
  scroll-snap-type: y proximity;
}

main > section[id] {
  min-height: max(720px, calc(100vh - var(--header-offset)));
  margin-top: 0;
  margin-bottom: 0;
  scroll-margin-top: var(--header-offset);
  scroll-snap-align: start;
}

#home.hero-section {
  scroll-margin-top: var(--header-offset);
}

#products,
#recycling,
#oem,
#scenarios,
#guide,
#contact {
  min-height: max(760px, calc(100vh - var(--header-offset)));
  scroll-margin-top: var(--header-offset);
}

#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section,
#contact.contact-section {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
}

#products.product-section {
  scroll-margin-top: var(--header-offset);
}

#products .section-heading {
  margin-bottom: 34px;
}

@media (min-width: 760px) and (max-width: 980px) {
  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section,
  #contact.contact-section {
    min-height: calc(100vh - var(--header-offset));
    padding-top: var(--section-y-compact);
    padding-bottom: var(--section-y-compact);
    scroll-margin-top: var(--header-offset);
  }
}

@media (max-width: 720px) {
  :root {
    --header-offset: 76px;
  }

  html {
    scroll-snap-type: none;
  }

  main > section[id],
  #products,
  #recycling,
  #oem,
  #scenarios,
  #guide,
  #contact {
    min-height: calc(100svh - var(--header-offset));
    scroll-margin-top: var(--header-offset);
  }

  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section,
  #contact.contact-section {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

/* Light conversion footer pass: reduce bottom visual weight while keeping the existing structure. */
#contact.contact-section {
  grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1.18fr);
  align-items: stretch;
  gap: clamp(28px, 4vw, 56px);
  margin-bottom: 0;
  background:
    radial-gradient(circle at 18% 28%, rgba(223, 13, 20, 0.055), transparent 34%),
    linear-gradient(180deg, #fafafa 0%, #f7f8fa 100%);
  border-bottom: 1px solid #eceef2;
}

#contact .contact-copy {
  display: grid;
  align-items: stretch;
  color: var(--ink);
}

#contact .contact-brand-row {
  align-items: stretch;
  gap: 20px;
  width: 100%;
  min-height: 100%;
  padding: 30px;
  background: #fff;
  border: 1px solid rgba(236, 238, 242, 0.95);
  border-radius: 8px;
  box-shadow: 0 22px 58px rgba(18, 20, 24, 0.08);
}

#contact .contact-brand-block {
  align-content: center;
  max-width: 360px;
}

#contact .contact-brand-header {
  color: #111;
}

#contact .contact-brand-header img {
  filter: none;
}

#contact .contact-brand-slogan,
#contact .contact-copy strong {
  color: #111;
}

#contact .contact-brand-service,
#contact .contact-copy p {
  color: #59616d;
}

#contact .contact-wechat-actions {
  margin-left: auto;
}

#contact .wechat-qr-card {
  color: #111;
  background: #fafafa;
  border-color: #eceef2;
  box-shadow: none;
}

#contact .wechat-qr-card img {
  border: 1px solid #eceef2;
}

#contact .contact-form {
  align-content: start;
  padding: clamp(26px, 3vw, 34px);
  border-color: rgba(223, 227, 232, 0.9);
  box-shadow: 0 22px 58px rgba(18, 20, 24, 0.08);
}

#contact .contact-form label {
  gap: 9px;
  color: #20242b;
}

#contact .contact-form input,
#contact .contact-form select,
#contact .contact-form textarea {
  min-height: 48px;
  background: #fff;
  border-color: #dfe3e8;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    background-color 0.18s ease;
}

#contact .contact-form input:focus,
#contact .contact-form select:focus,
#contact .contact-form textarea:focus {
  background: #fff;
  border-color: rgba(223, 13, 20, 0.55);
  box-shadow: 0 0 0 4px rgba(223, 13, 20, 0.08);
  outline: none;
}

.contact-trust-line {
  margin: -2px 0 0;
  color: #69717d;
  font-size: 14px;
  font-weight: 800;
  text-align: center;
}

.site-footer {
  padding-top: 64px;
  padding-bottom: 30px;
  color: #cbd5e1;
  background: #1f2937;
}

.footer-grid {
  grid-template-columns: minmax(260px, 1.3fr) repeat(2, minmax(180px, 1fr));
  gap: clamp(28px, 5vw, 72px);
}

.footer-brand-block {
  max-width: 480px;
}

.footer-brand-block h3 {
  margin-bottom: 14px;
}

.footer-brand-block strong {
  font-size: 20px;
}

.footer-brand-block p,
.site-footer p,
.site-footer a {
  color: #c1cad7;
}

.site-footer a:hover {
  color: #fff;
}

.footer-bottom {
  color: #aab5c4;
  border-top-color: rgba(255, 255, 255, 0.1);
}

@media (max-width: 1120px) {
  #contact.contact-section {
    grid-template-columns: 1fr;
  }

  #contact .contact-brand-row {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  #contact .contact-brand-row {
    display: grid;
    padding: 22px;
  }

  #contact .contact-wechat-actions {
    width: 100%;
    margin-left: 0;
  }

  #contact .wechat-qr-card {
    width: 100%;
    max-width: 240px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }
}

/* Option 1 lock: Contact + Footer must stay as left brand / right form + separate dark footer. */
#contact.contact-section {
  width: min(92vw, 1480px);
  min-height: auto;
  margin: 96px auto;
  padding: 16px;
  display: grid;
  grid-template-columns: minmax(330px, 0.58fr) minmax(0, 1fr);
  gap: 16px;
  align-items: stretch;
  background: #fff;
  border: 1px solid rgba(236, 238, 242, 0.95);
  border-radius: 8px;
  box-shadow: 0 28px 80px rgba(18, 20, 24, 0.08);
}

#contact .contact-copy,
#contact .contact-form {
  min-height: 100%;
  border: 1px solid #eceef2;
  border-radius: 8px;
  box-shadow: none;
}

#contact .contact-copy {
  display: grid;
  background:
    radial-gradient(circle at 10% 40%, rgba(223, 13, 20, 0.08) 0 8px, transparent 9px),
    radial-gradient(circle at 100% 100%, rgba(223, 13, 20, 0.1), transparent 34%),
    linear-gradient(180deg, #fff 0%, #fafafa 100%);
  overflow: hidden;
}

#contact .contact-brand-row {
  display: grid;
  justify-items: center;
  align-content: center;
  gap: 18px;
  width: 100%;
  min-height: 100%;
  padding: clamp(28px, 3.4vw, 48px) 24px;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

#contact .contact-brand-block {
  justify-items: center;
  text-align: center;
}

#contact .contact-brand-header {
  display: grid;
  justify-items: center;
  gap: 8px;
  color: #101114;
}

#contact .contact-brand-header .contact-mascot {
  display: block;
  width: 62px;
  height: 62px;
  object-fit: contain;
  filter: none;
}

#contact .contact-brand-header .contact-wordmark {
  display: block;
  width: 168px;
  height: auto;
  object-fit: contain;
  filter: none;
}

#contact .contact-brand-header span {
  color: #101114;
  font-size: 26px;
  font-weight: 950;
  line-height: 1;
}

#contact .contact-brand-header small {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

#contact .contact-brand-header::before {
  display: none;
}

#contact .contact-brand-slogan {
  position: relative;
  margin-top: 12px;
  color: #17191d;
  font-size: clamp(26px, 2.4vw, 34px);
  line-height: 1.18;
  font-weight: 950;
}

#contact .contact-brand-slogan::before {
  content: "";
  display: block;
  width: 34px;
  height: 4px;
  margin: 0 auto 14px;
  background: var(--red);
  border-radius: 999px;
}

#contact .contact-brand-service {
  color: #4f5661;
  font-size: clamp(16px, 1.25vw, 19px);
  font-weight: 800;
}

#contact .contact-wechat-actions {
  width: auto;
  margin: 0;
}

#contact .wechat-qr-card {
  width: 156px;
  padding: 12px;
  color: #17191d;
  background: #fff;
  border: 1px solid #eceef2;
  border-radius: 8px;
  box-shadow: 0 18px 46px rgba(18, 20, 24, 0.08);
}

#contact .wechat-qr-card img {
  width: 132px;
  height: 132px;
  padding: 6px;
  object-fit: contain;
}

#contact .wechat-qr-card span {
  color: #17191d;
}

#contact .contact-form {
  align-content: start;
  gap: 18px 30px;
  padding: clamp(28px, 3.2vw, 46px);
  background: #fff;
}

#contact .contact-form label {
  gap: 10px;
  color: #101114;
  font-size: 16px;
  font-weight: 950;
}

#contact .contact-form input,
#contact .contact-form select,
#contact .contact-form textarea {
  min-height: 46px;
  padding: 12px 16px;
  background: #fff;
  border: 1px solid #dfe3e8;
  border-radius: 8px;
}

#contact .contact-form textarea {
  min-height: 112px;
}

.contact-button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.contact-button-row .btn {
  width: 100%;
  min-height: 54px;
  border-radius: 8px;
}

.contact-wechat-btn {
  color: var(--red);
  background: #fff;
  border: 1px solid var(--red);
}

.contact-wechat-btn:hover {
  color: #fff;
  background: var(--red);
}

.contact-trust-line {
  margin: -8px 0 0;
}

.site-footer {
  margin-top: 0;
  padding: 68px clamp(24px, 5vw, 96px) 28px;
  color: #252a31;
  background:
    radial-gradient(circle at 92% 58%, rgba(223, 13, 20, 0.045), transparent 28%),
    linear-gradient(180deg, #fff 0%, #f8f9fb 100%);
  border-top: 2px solid rgba(223, 13, 20, 0.72);
}

.footer-grid {
  grid-template-columns: minmax(260px, 1.3fr) repeat(2, minmax(180px, 1fr));
  gap: clamp(28px, 5vw, 72px);
  max-width: 1480px;
}

.site-footer h2,
.site-footer h3,
.footer-brand-block strong {
  color: #101114;
}

.site-footer h3 {
  position: relative;
  padding-bottom: 12px;
}

.site-footer h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--red);
  border-radius: 999px;
}

.footer-brand-block p,
.site-footer p,
.site-footer a {
  color: #4f5661;
}

.footer-bottom {
  max-width: 1480px;
  color: #7b8491;
  text-align: center;
  border-top-color: #dfe3e8;
}

@media (max-width: 720px) {
  #contact.contact-section {
    width: min(94vw, 760px);
    grid-template-columns: 1fr;
    margin: 72px auto;
  }

  #contact .contact-brand-row {
    padding: 38px 22px;
  }
}

@media (max-width: 720px) {
  #contact.contact-section {
    width: calc(100% - 28px);
    margin: 56px auto;
    padding: 10px;
  }

  #contact .contact-form {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 22px;
  }

  .contact-button-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .site-footer {
    padding-bottom: 90px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* Footer reference lock: light 4-column footer with compact B2B spacing. */
.site-footer {
  padding: 34px clamp(24px, 8vw, 150px) 18px;
  color: #252a31;
  background:
    radial-gradient(circle at 94% 56%, rgba(18, 20, 24, 0.035), transparent 24%),
    linear-gradient(180deg, #fff 0%, #f8f9fb 100%);
  border-top: 2px solid rgba(223, 13, 20, 0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(30px, 6vw, 86px);
  max-width: 1500px;
  margin: 0 auto;
}

.site-footer h3 {
  margin: 0 0 22px;
  padding-bottom: 12px;
  color: #101114;
  font-size: 18px;
  line-height: 1.2;
  font-weight: 950;
}

.site-footer h3::after {
  width: 22px;
  height: 2px;
  background: var(--red);
}

.site-footer h2 {
  margin: 0 0 12px;
  color: #101114;
  font-size: 24px;
  line-height: 1.2;
  font-weight: 950;
}

.footer-brand-block {
  gap: 0;
}

.footer-brand-block h2 span {
  font-size: 13px;
}

.footer-brand-block strong {
  margin: 0 0 8px;
  color: #4f5661;
  font-size: 15px;
  line-height: 1.5;
  font-weight: 800;
}

.footer-brand-block p,
.site-footer p,
.site-footer a {
  margin: 0 0 8px;
  color: #5f6875;
  font-size: 15px;
  line-height: 1.45;
  font-weight: 700;
}

.site-footer a:hover {
  color: var(--red);
}

.footer-bottom {
  max-width: 1500px;
  margin: 20px auto 0;
  padding-top: 16px;
  color: #8a94a3;
  font-size: 14px;
  text-align: center;
  border-top: 1px solid #dfe3e8;
}

@media (max-width: 980px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-footer {
    padding: 32px 22px 90px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* Scenario gallery: image-only cards with full, uncropped artwork. */
#scenarios .scenario-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

#scenarios .scenario-card {
  padding: 0;
  overflow: hidden;
  background: #fff;
}

#scenarios .scenario-image {
  aspect-ratio: 4 / 3;
  background: #fff;
  overflow: hidden;
}

#scenarios .scenario-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  transform: none;
}

#scenarios .scenario-card:hover .scenario-image img {
  transform: none;
}

#scenarios .scenario-content {
  display: none;
}

@media (max-width: 980px) {
  #scenarios .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  #scenarios .scenario-grid {
    grid-template-columns: 1fr;
  }
}

/* Scroll Rhythm System: final layout pass for one-page section alignment. */
:root {
  --section-gap: 120px;
  --section-padding: 100px;
  --section-padding-compact: 72px;
  --card-gap: 24px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-offset);
  scroll-snap-type: y mandatory;
}

main > section[id] {
  min-height: max(720px, calc(100svh - var(--header-offset)));
  margin-top: 0;
  margin-bottom: 0;
  scroll-margin-top: var(--header-offset);
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

#home.hero-section,
#home .hero-inner {
  min-height: max(720px, calc(100svh - var(--header-offset)));
}

#services.service-section,
#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section {
  min-height: max(720px, calc(100svh - var(--header-offset)));
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
  scroll-margin-top: var(--header-offset);
}

#products.product-section {
  margin-top: 0;
  padding-top: clamp(42px, 5vh, 64px);
  padding-bottom: clamp(42px, 5vh, 64px);
}

/* Product supply viewport fit: keep the three cards visible as one self-contained screen. */
#products .section-heading {
  margin-bottom: 24px;
}

#products .section-heading p {
  margin-bottom: 10px;
}

#products .section-heading h2 {
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.08;
}

#products .grade-grid {
  gap: clamp(16px, 1.8vw, 24px);
}

#products .grade-card,
#products .grade-card.recommended {
  min-height: 500px;
  padding: 28px 24px 20px;
}

#products .grade-card.recommended {
  transform: none;
}

#products .grade-card h3 {
  margin-bottom: 12px;
}

#products .grade-label {
  min-height: 32px;
  margin-bottom: 12px;
}

#products .grade-copy small {
  margin-top: 10px;
}

#products .grade-cta {
  min-height: 42px;
  margin-top: 12px;
}

#products .grade-visual {
  min-height: clamp(300px, 30vw, 420px);
  margin: 34px 0 0;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(86%, 500px);
  max-width: 86%;
  height: clamp(300px, 30vw, 420px);
  object-fit: contain;
  object-position: center bottom;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products.product-section {
    min-height: calc(100svh - var(--header-offset));
    padding-top: 14px;
    padding-bottom: 28px;
  }

  #products .section-heading {
    margin-bottom: 14px;
  }

  #products .section-heading p {
    margin-bottom: 8px;
    font-size: 20px;
  }

  #products .section-heading h2 {
    font-size: clamp(34px, 4.5vw, 50px);
  }

  #products .grade-card,
  #products .grade-card.recommended {
    min-height: 430px;
    padding: 20px 22px 16px;
  }

  #products .grade-card span {
    font-size: clamp(28px, 3vw, 36px);
  }

  #products .grade-card h3 {
    margin: 6px 0 10px;
    font-size: clamp(24px, 2.6vw, 30px);
  }

  #products .grade-label {
    min-height: 30px;
    margin-bottom: 10px;
  }

  #products .grade-card p {
    font-size: 15px;
    line-height: 1.55;
  }

  #products .grade-copy small {
    margin-top: 8px;
    font-size: 13px;
  }

  #products .grade-cta {
    min-height: 38px;
    margin-top: 10px;
  }

  #products .grade-visual {
    min-height: 232px;
    margin-top: 44px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(86%, 310px);
    max-width: 86%;
    height: 232px;
  }
}

#scenarios.scenario-section {
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
}

#contact.contact-section {
  min-height: max(720px, calc(100svh - var(--header-offset)));
  margin-top: 0;
  margin-bottom: 0;
  scroll-margin-top: var(--header-offset);
}

.section-heading,
#products .section-heading,
#guide .section-heading {
  margin-bottom: calc(var(--card-gap) * 1.5);
}

.card-grid,
.grade-grid,
.process-list,
.scenario-grid,
.tutorial-grid {
  gap: var(--card-gap);
}

@media (max-width: 980px) {
  :root {
    --section-gap: 96px;
    --section-padding: 76px;
    --card-gap: 20px;
  }

  main > section[id],
  #home.hero-section,
  #home .hero-inner,
  #services.service-section,
  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section,
  #contact.contact-section {
    min-height: max(680px, calc(100svh - var(--header-offset)));
  }
}

@media (max-width: 720px) {
  :root {
    --section-gap: 72px;
    --section-padding: 64px;
    --card-gap: 18px;
  }

  html {
    scroll-snap-type: y proximity;
  }

  main > section[id],
  #home.hero-section,
  #home .hero-inner,
  #services.service-section,
  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section,
  #contact.contact-section {
    min-height: calc(100svh - var(--header-offset));
  }

  #services.service-section,
  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section {
    padding-top: var(--section-padding);
    padding-bottom: var(--section-padding);
  }
}
/* True final product supply override: keep after all global rhythm rules. */
#products.product-section {
  min-height: calc(100svh - var(--header-offset));
  padding-top: clamp(28px, 4.2vh, 52px);
  padding-bottom: clamp(28px, 4.2vh, 52px);
  scroll-margin-top: var(--header-offset);
}

#products .section-heading {
  max-width: 920px;
  margin-bottom: 28px;
}

#products .section-heading p {
  margin-bottom: 10px;
}

#products .section-heading h2 {
  font-size: clamp(38px, 4.2vw, 62px);
  line-height: 1.08;
}

#products .grade-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 1120px;
  gap: 22px;
  margin: 0 auto;
}

#products .grade-card,
#products .grade-card.recommended {
  display: grid;
  grid-template-rows: minmax(236px, auto) 1fr;
  min-height: 540px;
  padding: 28px 28px 20px;
  border-color: rgba(17, 24, 39, 0.1);
  box-shadow: 0 22px 54px rgba(18, 20, 24, 0.075);
  transform: none;
}

#products .grade-card.recommended {
  border-color: rgba(217, 45, 43, 0.32);
  box-shadow: 0 24px 58px rgba(217, 45, 43, 0.11);
}

#products .grade-card::after {
  right: -92px;
  bottom: 54px;
  width: 250px;
  height: 250px;
  border-width: 30px;
  opacity: 0.58;
}

#products .grade-copy {
  display: flex;
  min-height: 236px;
  flex-direction: column;
}

#products .grade-card span {
  font-size: clamp(32px, 2.7vw, 42px);
  line-height: 1.05;
}

#products .grade-card h3 {
  margin: 8px 0 14px;
  font-size: clamp(25px, 2vw, 34px);
  line-height: 1.1;
}

#products .grade-label {
  width: max-content;
  min-height: 32px;
  margin-bottom: 14px;
  padding: 0 12px;
}

#products .grade-card p {
  margin: 0;
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.62;
}

#products .grade-copy small {
  margin-top: auto;
  font-size: 14px;
  line-height: 1.4;
}

#products .grade-cta {
  width: 100%;
  min-height: 44px;
  margin-top: 12px;
}

#products .grade-visual {
  display: flex;
  min-height: 260px;
  margin: 16px 0 0;
  align-items: flex-end;
  justify-content: center;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(86%, 310px);
  max-width: 86%;
  height: 252px;
  object-fit: contain;
  object-position: center bottom;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products.product-section {
    padding-top: 18px;
    padding-bottom: 22px;
  }

  #products .section-heading {
    margin-bottom: 18px;
  }

  #products .section-heading p {
    margin-bottom: 8px;
    font-size: 20px;
  }

  #products .section-heading h2 {
    font-size: clamp(36px, 4.5vw, 52px);
  }

  #products .grade-grid {
    max-width: 1100px;
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    grid-template-rows: minmax(214px, auto) 1fr;
    min-height: 500px;
    padding: 22px 22px 16px;
  }

  #products .grade-copy {
    min-height: 214px;
  }

  #products .grade-card span {
    font-size: clamp(30px, 3.3vw, 38px);
  }

  #products .grade-card h3 {
    margin: 6px 0 10px;
    font-size: clamp(24px, 2.9vw, 30px);
  }

  #products .grade-label {
    min-height: 30px;
    margin-bottom: 10px;
    padding: 0 10px;
    font-size: 13px;
  }

  #products .grade-card p {
    font-size: 15px;
    line-height: 1.52;
  }

  #products .grade-copy small {
    font-size: 13px;
  }

  #products .grade-cta {
    min-height: 38px;
    margin-top: 10px;
  }

  #products .grade-visual {
    min-height: 238px;
    margin-top: 12px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(84%, 292px);
    max-width: 84%;
    height: 232px;
  }
}

@media (max-width: 759px) {
  #products.product-section {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  #products .section-heading {
    margin-bottom: 24px;
  }

  #products .grade-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    grid-template-rows: auto auto;
    min-height: 0;
    padding: 24px 22px 20px;
  }

  #products .grade-copy {
    min-height: 0;
  }

  #products .grade-visual {
    min-height: 230px;
    margin-top: 22px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(84%, 300px);
    max-width: 84%;
    height: 230px;
  }
}
/* True final scenario section fit: image-focused 3x2 standalone module. */
#scenarios.scenario-section {
  min-height: calc(100svh - var(--header-offset));
  padding-top: clamp(14px, 2.5vh, 28px);
  padding-bottom: clamp(16px, 2.5vh, 28px);
  scroll-margin-top: var(--header-offset);
}

#scenarios .scenario-container {
  max-width: 1220px;
  padding: 0 28px;
}

#scenarios .section-eyebrow {
  margin-bottom: 6px;
  font-size: clamp(17px, 1.8vw, 22px);
  line-height: 1.1;
}

#scenarios .section-title {
  max-width: 860px;
  margin-bottom: 18px;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.12;
}

#scenarios .scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 18px;
  height: calc(100svh - 160px);
  min-height: 520px;
  max-height: 680px;
}

#scenarios .scenario-card {
  display: flex;
  min-height: 0;
  padding: 10px;
  overflow: hidden;
  flex-direction: column;
  justify-content: flex-start;
  background: #fff;
  border: 1px solid rgba(17, 24, 39, 0.08);
  border-radius: 14px;
  box-shadow: 0 18px 48px rgba(18, 20, 24, 0.08);
}

#scenarios .scenario-image {
  display: flex;
  width: 100%;
  min-height: 160px;
  flex: 1;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #fff;
  border-radius: 10px;
}

#scenarios .scenario-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

@media (min-width: 760px) and (max-height: 900px) {
  #scenarios.scenario-section {
    padding-top: 8px;
    padding-bottom: 12px;
  }

  #scenarios .scenario-container {
    max-width: 1180px;
    padding: 0 24px;
  }

  #scenarios .section-eyebrow {
    margin-bottom: 4px;
    font-size: 19px;
  }

  #scenarios .section-title {
    margin-bottom: 14px;
    font-size: clamp(26px, 3.25vw, 36px);
  }

  #scenarios .scenario-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 12px;
    height: calc(100svh - 150px);
    min-height: 500px;
    max-height: 620px;
  }

  #scenarios .scenario-card {
    padding: 8px;
  }

  #scenarios .scenario-image {
    min-height: 150px;
  }
}

@media (max-width: 759px) {
  #scenarios.scenario-section {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  #scenarios .scenario-container {
    padding: 0 20px;
  }

  #scenarios .section-title {
    margin-bottom: 22px;
  }

  #scenarios .scenario-grid {
    height: auto;
    min-height: 0;
    max-height: none;
    grid-template-columns: 1fr;
    grid-template-rows: none;
    gap: 18px;
  }

  #scenarios .scenario-card {
    padding: 10px;
  }

  #scenarios .scenario-image {
    aspect-ratio: 4 / 3;
    min-height: 0;
    flex: none;
  }
}

/* Unified full-screen proportion system. Keep this as the last layout layer. */
:root {
  --container-max: 1440px;
  --section-min-height: calc(100svh - 96px);
  --section-padding-top: 32px;
  --section-padding-bottom: 32px;
  --section-gap: 24px;
  --title-block-height: 132px;
  --title-label-size: 16px;
  --title-main-size: 56px;
  --title-sub-size: 18px;
  --card-radius: 18px;
  --card-padding: 24px;
  --card-gap: 18px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.06);
  --border-soft: 1px solid rgba(220, 60, 40, 0.12);
}

main > section[id],
#home.hero-section,
#services.service-section,
#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section,
#contact.contact-section {
  min-height: var(--section-min-height);
  margin-top: 0;
  margin-bottom: 0;
  padding-top: var(--section-padding-top);
  padding-bottom: var(--section-padding-bottom);
  scroll-margin-top: 96px;
}

#services.service-section,
#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section {
  display: flex;
  align-items: center;
  justify-content: center;
}

#services.service-section,
#products.product-section,
#oem.refill-section,
#guide.tutorial-section {
  flex-direction: column;
  gap: var(--section-gap);
}

#services .section-heading,
#products .section-heading,
#oem .section-heading,
#guide .section-heading,
#scenarios .scenario-container > .section-eyebrow,
#scenarios .scenario-container > .section-title {
  text-align: center;
}

#services .section-heading,
#products .section-heading,
#oem .section-heading,
#guide .section-heading {
  display: flex;
  height: var(--title-block-height);
  max-width: 980px;
  margin: 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

#services .section-heading p,
#products .section-heading p,
#oem .section-heading p,
#guide .section-heading p,
#recycling .section-eyebrow,
#scenarios .section-eyebrow {
  margin: 0;
  color: #d63c2d;
  font-size: var(--title-label-size);
  line-height: 1.15;
  font-weight: 900;
}

#services .section-heading h2,
#products .section-heading h2,
#oem .section-heading h2,
#guide .section-heading h2,
#recycling h2,
#scenarios .section-title {
  margin: 0;
  color: #111;
  font-size: clamp(34px, 4vw, var(--title-main-size));
  line-height: 1.12;
  font-weight: 950;
  letter-spacing: 0;
}

#services .service-card,
#products .grade-card,
#recycling .recycling-card,
#oem .process-list li,
#scenarios .scenario-card,
#guide .tutorial-card,
#contact.contact-section {
  background: #fff;
  border: var(--border-soft);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

/* Home: stable 42/58 split and one-screen hero. */
#home.hero-section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 28px;
  padding-bottom: 28px;
}

#home .hero-inner {
  display: grid;
  width: min(var(--container-max), 92vw);
  min-height: calc(100svh - 152px);
  grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: center;
}

#home .hero-copy {
  align-self: center;
}

#home .hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

#home .hero-trust {
  gap: 10px;
  margin-top: 18px;
}

#home .hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

#home .hero-product-image {
  width: min(100%, 760px);
  max-height: calc(100svh - 190px);
  object-fit: contain;
}

/* Why choose: compact equal feature cards. */
#services .card-grid.why-grid {
  display: grid;
  width: min(var(--container-max), 92vw);
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 20px;
}

#services .service-card {
  display: grid;
  min-height: 230px;
  padding: 22px 18px;
  align-content: start;
  gap: 12px;
}

#services .card-icon {
  width: 42px;
  height: 42px;
}

#services .service-card h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
}

#services .service-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

/* 45A supply: narrower premium cards with stronger image area. */
#products .grade-grid {
  display: grid;
  width: min(1160px, 92vw);
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin: 0 auto;
}

#products .grade-card,
#products .grade-card.recommended {
  display: grid;
  min-height: 520px;
  padding: 24px 24px 18px;
  grid-template-rows: minmax(188px, auto) 1fr;
  transform: none;
}

#products .grade-copy {
  display: flex;
  min-height: 188px;
  flex-direction: column;
}

#products .grade-copy small {
  margin-top: auto;
}

#products .grade-cta {
  width: 100%;
  min-height: 40px;
  margin-top: 10px;
}

#products .grade-visual {
  display: flex;
  min-height: 300px;
  margin: 12px 0 0;
  align-items: flex-end;
  justify-content: center;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(90%, 330px);
  max-width: 90%;
  height: 292px;
  object-fit: contain;
  object-position: center bottom;
}

/* Recycling: 34/66 layout and hide visual-noise support line without changing content. */
#recycling.recycling-section {
  display: flex;
  align-items: center;
  justify-content: center;
}

#recycling .recycling-container {
  display: grid;
  width: min(var(--container-max), 92vw);
  grid-template-columns: minmax(280px, 0.34fr) minmax(0, 0.66fr);
  gap: 28px;
  align-items: center;
}

#recycling .recycling-copy {
  padding: 28px 0;
}

#recycling .recycling-showcase {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

#recycling .recycling-card {
  display: grid;
  min-height: 440px;
  padding: 20px 18px 16px;
  grid-template-rows: minmax(128px, auto) 1fr;
}

#recycling .recycling-card-copy p {
  font-size: 14px;
  line-height: 1.55;
}

#recycling .recycling-card-image {
  height: auto;
  min-height: 280px;
}

#recycling .recycling-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center bottom;
}

#recycling .recycling-support-line {
  display: none;
}

/* OEM / refill: five equal process cards. */
#oem .process-list {
  display: grid;
  width: min(var(--container-max), 92vw);
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
  margin: 0 auto;
}

#oem .process-list li {
  display: grid;
  min-height: 430px;
  padding: 20px 16px 16px;
  grid-template-rows: auto auto minmax(46px, auto) 1fr;
}

#oem .process-list strong {
  font-size: 19px;
  line-height: 1.25;
}

#oem .process-list p {
  margin: 8px 0 12px;
  font-size: 13px;
  line-height: 1.45;
}

#oem .process-list img {
  width: 100%;
  height: 250px;
  object-fit: contain;
  object-position: center bottom;
}

#oem .center-btn {
  margin-top: 2px;
}

/* Scenarios: image-led 3x2 visual grid. */
#scenarios.scenario-section {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--section-min-height);
  padding-top: 20px;
  padding-bottom: 22px;
}

#scenarios .scenario-container {
  width: min(var(--container-max), 92vw);
  max-width: 1220px;
  padding: 0;
}

#scenarios .section-eyebrow {
  margin-bottom: 6px;
}

#scenarios .section-title {
  margin-bottom: 18px;
  font-size: clamp(30px, 3.4vw, 44px);
}

#scenarios .scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 16px;
  height: calc(100svh - 170px);
  min-height: 500px;
  max-height: 660px;
}

#scenarios .scenario-card {
  display: flex;
  min-height: 0;
  padding: 8px;
  background: #fff;
}

#scenarios .scenario-image {
  display: flex;
  width: 100%;
  min-height: 0;
  flex: 1;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
}

#scenarios .scenario-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

/* Tutorials: 4 equal cards, image dominant. */
#guide .tutorial-grid {
  display: grid;
  width: min(var(--container-max), 92vw);
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

#guide .tutorial-card {
  display: grid;
  min-height: 420px;
  grid-template-rows: 66% 34%;
}

#guide .tutorial-card img {
  width: 100%;
  height: 100%;
  aspect-ratio: auto;
  object-fit: contain;
  background: #fff;
}

#guide .tutorial-card div {
  display: flex;
  padding: 16px 18px 18px;
  flex-direction: column;
}

#guide .tutorial-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

#guide .tutorial-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.52;
}

#guide .tutorial-card a {
  margin-top: auto;
}

/* Contact and footer: clean closing screen. */
#contact.contact-section {
  display: grid;
  width: min(var(--container-max), 92vw);
  min-height: var(--section-min-height);
  margin: 0 auto;
  padding: 32px;
  grid-template-columns: minmax(280px, 0.36fr) minmax(0, 0.64fr);
  gap: 28px;
  align-items: stretch;
}

#contact .contact-copy,
#contact .contact-form {
  min-height: 0;
}

#contact .contact-form {
  align-content: start;
  gap: 14px 16px;
}

#contact .contact-form textarea {
  min-height: 108px;
}

.site-footer {
  padding: 34px 0 22px;
  background: #f7f8fa;
}

.site-footer .footer-grid {
  width: min(var(--container-max), 92vw);
  gap: 24px;
}

.site-footer .footer-bottom {
  margin-top: 20px;
}

@media (min-width: 760px) and (max-height: 900px) {
  :root {
    --title-block-height: 112px;
    --section-padding-top: 18px;
    --section-padding-bottom: 20px;
    --section-gap: 18px;
  }

  #services .service-card {
    min-height: 205px;
    padding: 18px 14px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    min-height: 500px;
    grid-template-rows: minmax(178px, auto) 1fr;
  }

  #products .grade-visual {
    min-height: 282px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(86%, 300px);
    height: 268px;
  }

  #recycling .recycling-card {
    min-height: 400px;
  }

  #recycling .recycling-card-image {
    min-height: 240px;
  }

  #oem .process-list li {
    min-height: 390px;
  }

  #oem .process-list img {
    height: 218px;
  }

  #scenarios .scenario-grid {
    height: calc(100svh - 150px);
    min-height: 500px;
    gap: 12px;
  }

  #guide .tutorial-card {
    min-height: 360px;
  }
}

@media (max-width: 1180px) {
  #services .card-grid.why-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  #oem .process-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  #oem .process-list li {
    padding: 16px 12px 14px;
  }
}

@media (max-width: 980px) {
  #home .hero-inner,
  #recycling .recycling-container,
  #contact.contact-section {
    grid-template-columns: 1fr;
  }

  #products .grade-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    min-height: 480px;
    padding: 18px 16px 14px;
  }

  #recycling .recycling-showcase {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  #scenarios .scenario-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  #guide .tutorial-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 759px) {
  main > section[id],
  #home.hero-section,
  #services.service-section,
  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section,
  #contact.contact-section {
    min-height: auto;
    padding-top: 56px;
    padding-bottom: 64px;
  }

  #services .section-heading,
  #products .section-heading,
  #oem .section-heading,
  #guide .section-heading {
    height: auto;
    margin-bottom: 22px;
  }

  #home .hero-inner,
  #services .card-grid.why-grid,
  #products .grade-grid,
  #recycling .recycling-showcase,
  #oem .process-list,
  #scenarios .scenario-grid,
  #guide .tutorial-grid {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
    max-height: none;
  }

  #products .grade-card,
  #recycling .recycling-card,
  #oem .process-list li,
  #guide .tutorial-card {
    min-height: 0;
  }

  #scenarios .scenario-image {
    aspect-ratio: 4 / 3;
    flex: none;
  }

  #contact.contact-section {
    width: min(94vw, 760px);
    padding: 24px 18px;
  }
}

/* Precision fix: OEM process-card image area only. */
#oem .process-list li > img {
  align-self: stretch;
  justify-self: center;
  width: 100%;
  height: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
  object-fit: contain;
  object-position: center;
}

/* Precision fix: scenario header text alignment only. */
#scenarios .section-eyebrow,
#scenarios .section-title {
  display: block;
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

/* Precision fix: contact left-panel vertical alignment only. */
@media (min-width: 981px) {
  #contact .contact-copy {
    align-self: center;
  }

  #contact .contact-brand-row {
    transform: translateY(-10px);
  }
}

/* Global visual alignment system: content-preserving final layer. */
:root {
  --alignment-header-height: 96px;
  --alignment-container-max: 1440px;
  --alignment-section-padding-y: 80px;
  --alignment-section-padding-x: 48px;
  --alignment-baseline-offset: 0px;
}

main > section[id] {
  box-sizing: border-box;
  scroll-margin-top: var(--alignment-header-height);
}

#home.hero-section,
#services.service-section,
#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section,
#contact.contact-section {
  margin-top: 0;
  margin-bottom: 0;
}

#services.service-section,
#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: var(--alignment-section-padding-y);
  padding-bottom: var(--alignment-section-padding-y);
}

#services > .section-heading,
#products > .section-heading,
#oem > .section-heading,
#guide > .section-heading,
#scenarios .section-eyebrow,
#scenarios .section-title {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

#services > .section-heading,
#products > .section-heading,
#oem > .section-heading,
#guide > .section-heading {
  align-items: center;
  justify-content: center;
}

#services > .section-heading *,
#products > .section-heading *,
#oem > .section-heading *,
#guide > .section-heading *,
#scenarios .section-eyebrow,
#scenarios .section-title {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

#home .hero-inner,
#recycling .recycling-container,
#contact.contact-section {
  align-items: center;
}

#services .card-grid,
#products .grade-grid,
#recycling .recycling-showcase,
#oem .process-list,
#scenarios .scenario-grid,
#guide .tutorial-grid {
  align-items: stretch;
  justify-items: center;
}

#services .service-card,
#products .grade-card,
#recycling .recycling-card,
#oem .process-list li,
#scenarios .scenario-card,
#guide .tutorial-card {
  align-self: stretch;
}

#services .service-card img,
#products .grade-card img,
#recycling .recycling-card img,
#oem .process-list img,
#scenarios .scenario-card img,
#guide .tutorial-card img,
#home .hero-product-image,
#contact img {
  display: block;
  margin-right: auto;
  margin-left: auto;
  object-fit: contain;
  object-position: center;
}

@media (min-width: 981px) {
  #contact.contact-section {
    align-items: center;
  }

  #contact .contact-copy,
  #contact .contact-form {
    align-self: center;
  }

  #contact .contact-brand-row {
    transform: none;
  }
}

@media (max-width: 980px) {
  #services.service-section,
  #products.product-section,
  #recycling.recycling-section,
  #oem.refill-section,
  #scenarios.scenario-section,
  #guide.tutorial-section {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

/* Precision fix: lift the application scenarios module so card bottoms remain visible. */
#scenarios.scenario-section {
  justify-content: flex-start;
  padding-top: 24px;
}

@media (min-width: 760px) and (max-height: 900px) {
  #scenarios.scenario-section {
    padding-top: 10px;
  }
}

/* Scroll behavior fix: disable snap so manual scrolling never jumps to contact/footer. */
html {
  scroll-behavior: smooth;
  scroll-snap-type: none;
}

main > section[id],
#home.hero-section,
#services.service-section,
#products.product-section,
#recycling.recycling-section,
#oem.refill-section,
#scenarios.scenario-section,
#guide.tutorial-section,
#contact.contact-section {
  scroll-snap-align: none;
  scroll-snap-stop: normal;
}

/* Precision fix: lift the 45A supply module without changing content. */
#products.product-section {
  justify-content: flex-start;
  padding-top: 24px;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products.product-section {
    padding-top: 10px;
  }
}

/* Precision fix: narrow and center 45A product images by one fifth. */
#products .grade-visual {
  justify-content: center;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(62%, 269px);
  max-width: 62%;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(62%, 219px);
    max-width: 62%;
  }
}

/* Precision fix: contact brand text matches the header logo treatment. */
#contact .contact-brand-name .brand-red-char {
  color: var(--red);
}

#contact .contact-brand-en {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 0;
  color: #101114;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  line-height: inherit;
}

#contact .contact-brand-en .brand-drop-o {
  position: relative;
  display: inline-block;
  width: 0.76em;
  height: 0.92em;
  margin: 0 0.04em;
  vertical-align: -0.1em;
}

#contact .contact-brand-en .brand-drop-o::before {
  content: "";
  position: absolute;
  inset: 0.02em 0.06em 0.02em;
  background: var(--red);
  border-radius: 50% 50% 56% 56% / 62% 62% 46% 46%;
  clip-path: polygon(50% 0%, 75% 28%, 91% 54%, 84% 78%, 64% 96%, 36% 96%, 16% 78%, 9% 54%, 25% 28%);
}

#contact .contact-brand-en .brand-drop-o::after {
  content: "";
  position: absolute;
  top: 0.5em;
  left: 50%;
  width: 0.28em;
  height: 0.28em;
  background: #fff;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

/* 45A supply reference match: scoped only to the target module. */
#products.product-section {
  justify-content: flex-start;
  padding-top: clamp(12px, 2.2vh, 28px);
  padding-bottom: clamp(22px, 3vh, 36px);
}

#products > .section-heading {
  max-width: 1280px;
  margin: 0 auto clamp(26px, 3.2vh, 38px);
  text-align: center;
}

#products > .section-heading p {
  margin: 0 0 8px;
  color: #d92d2b;
  font-size: clamp(18px, 1.5vw, 24px);
  font-weight: 800;
  line-height: 1;
}

#products > .section-heading h2 {
  margin: 0;
  color: #111;
  font-size: clamp(44px, 4.7vw, 76px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: 0;
}

#products .grade-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: min(1500px, calc(100vw - 140px));
  max-width: none;
  gap: clamp(22px, 2vw, 30px);
  margin: 0 auto;
}

#products .grade-card,
#products .grade-card.recommended {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: clamp(610px, 69vh, 742px);
  padding: clamp(30px, 2.4vw, 38px) clamp(28px, 2.35vw, 36px) clamp(22px, 2vw, 28px);
  overflow: hidden;
  border: 1px solid rgba(217, 45, 43, 0.22);
  border-radius: 24px;
  background: #fff;
  box-shadow: none;
  transform: none;
}

#products .grade-card.recommended {
  border-color: rgba(217, 45, 43, 0.28);
  box-shadow: none;
}

#products .grade-card::after {
  right: -86px;
  bottom: 72px;
  width: clamp(230px, 19vw, 330px);
  height: clamp(230px, 19vw, 330px);
  border-width: clamp(28px, 2.8vw, 42px);
  border-color: rgba(217, 45, 43, 0.055);
  opacity: 1;
}

#products .grade-copy {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  min-height: 0;
}

#products .grade-card span {
  color: #d92d2b;
  font-size: clamp(42px, 3.45vw, 58px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
}

#products .grade-card h3 {
  margin: 10px 0 14px;
  color: #111;
  font-size: clamp(30px, 2.35vw, 42px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0;
}

#products .grade-label {
  width: max-content;
  min-height: 0;
  margin: 0 0 16px;
  padding: 7px 14px 8px;
  border: 1px solid rgba(217, 45, 43, 0.34);
  border-radius: 10px;
  color: #d92d2b;
  background: rgba(217, 45, 43, 0.035);
  font-size: clamp(16px, 1.18vw, 20px);
  font-weight: 800;
  line-height: 1;
}

#products .grade-card p {
  margin: 0 0 6px;
  color: #5f6d7e;
  font-size: clamp(17px, 1.25vw, 22px);
  font-weight: 500;
  line-height: 1.58;
}

#products .grade-copy small {
  display: block;
  margin-top: 0;
  color: #2f3844;
  font-size: clamp(15px, 1.08vw, 19px);
  font-weight: 800;
  line-height: 1.35;
}

#products .grade-cta {
  width: 100%;
  min-height: clamp(46px, 4.9vh, 58px);
  margin-top: clamp(14px, 1.6vh, 20px);
  border-radius: 10px;
  font-size: clamp(17px, 1.2vw, 22px);
  font-weight: 900;
}

#products .grade-visual {
  display: flex;
  flex: 1 1 auto;
  align-items: flex-end;
  justify-content: center;
  min-height: 0;
  margin: clamp(18px, 2.2vh, 28px) -6px 0;
  padding: 0;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  display: block;
  width: min(78%, 336px);
  max-width: 78%;
  height: auto;
  max-height: 100%;
  object-fit: contain;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products.product-section {
    padding-top: 10px;
    padding-bottom: 18px;
  }

  #products > .section-heading {
    margin-bottom: 18px;
  }

  #products > .section-heading p {
    margin-bottom: 6px;
    font-size: 19px;
  }

  #products > .section-heading h2 {
    font-size: clamp(38px, 4.25vw, 56px);
  }

  #products .grade-grid {
    width: min(1420px, calc(100vw - 120px));
    gap: 24px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    height: clamp(520px, 67vh, 620px);
    padding: 26px 28px 20px;
  }

  #products .grade-card span {
    font-size: clamp(34px, 3vw, 46px);
  }

  #products .grade-card h3 {
    margin: 8px 0 12px;
    font-size: clamp(26px, 2.25vw, 34px);
  }

  #products .grade-label {
    margin-bottom: 12px;
    padding: 6px 12px 7px;
    font-size: 16px;
  }

  #products .grade-card p {
    margin-bottom: 4px;
    font-size: 16px;
    line-height: 1.48;
  }

  #products .grade-copy small {
    font-size: 14px;
  }

  #products .grade-cta {
    min-height: 42px;
    margin-top: 12px;
    font-size: 17px;
  }

  #products .grade-visual {
    margin-top: 14px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(78%, 274px);
    max-width: 78%;
  }
}

@media (max-width: 1180px) {
  #products .grade-grid {
    width: min(1080px, calc(100vw - 48px));
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    height: auto;
    min-height: 560px;
    padding: 24px 22px 18px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(80%, 270px);
    max-width: 80%;
  }
}

@media (max-width: 759px) {
  #products.product-section {
    padding-top: 48px;
    padding-bottom: 56px;
  }

  #products > .section-heading {
    margin-bottom: 24px;
  }

  #products > .section-heading h2 {
    font-size: clamp(30px, 10vw, 42px);
    line-height: 1.12;
  }

  #products .grade-grid {
    grid-template-columns: 1fr;
    width: min(420px, calc(100vw - 32px));
    gap: 18px;
  }

  #products .grade-card,
  #products .grade-card.recommended {
    height: auto;
    min-height: 0;
    padding: 26px 22px 18px;
  }

  #products .grade-card span {
    font-size: 38px;
  }

  #products .grade-card h3 {
    font-size: 30px;
  }

  #products .grade-visual {
    min-height: 240px;
    margin-top: 18px;
  }

  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(86%, 284px);
    max-width: 86%;
  }
}
/* True final precision fix: center 45A product images. */
#products .grade-visual {
  justify-content: center;
}

#products .grade-visual img,
#products .recommended .grade-visual img {
  width: min(88%, 378px);
  max-width: 88%;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products .grade-visual img,
  #products .recommended .grade-visual img {
    width: min(88%, 308px);
    max-width: 88%;
  }
}

/* Precision fix: compact the 45A supply module container and card group only. */
#products .grade-grid {
  width: min(1080px, calc(100vw - 160px));
  max-width: 1080px;
  gap: 16px;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 760px) and (max-height: 900px) {
  #products .grade-grid {
    width: min(1040px, calc(100vw - 160px));
    gap: 14px;
  }
}

@media (max-width: 759px) {
  #products .grade-grid {
    width: min(420px, calc(100vw - 32px));
    gap: 18px;
  }
}