:root {
  --paper: #f7fcfb;
  --mist: #edf9f7;
  --sky: #eef7fc;
  --ink: #18364a;
  --teal: #159889;
  --teal-dark: #176e69;
  --muted: #66828c;
  --line: #d6e8e5;
  --white: #ffffff;
  --soft-white: #fbfefd;
  --navy: #102f42;
  --danger: #a33a3a;
  --shadow: 0 24px 70px rgba(24, 82, 87, .11);
  --shadow-soft: 0 12px 36px rgba(24, 82, 87, .08);
  --shell: 1240px;
  --card-radius: 24px;
  --control-radius: 10px;
  --ease: cubic-bezier(.16, 1, .3, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
}

picture {
  display: block;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.shell {
  width: min(var(--shell), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 120;
  padding: 10px 14px;
  color: var(--white);
  background: var(--navy);
  border-radius: var(--control-radius);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  border-bottom: 1px solid rgba(214, 232, 229, .88);
  background: rgba(247, 252, 251, .94);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav-shell {
  height: 72px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 19px;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: .02em;
  white-space: nowrap;
}

.brand small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--teal);
  border-radius: 12px;
  font-size: 18px;
  box-shadow: 0 8px 20px rgba(21, 152, 137, .22);
}

.desktop-nav {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 28px);
  white-space: nowrap;
}

.desktop-nav > a,
.desktop-nav > .nav-cluster > .nav-parent {
  position: relative;
  color: #365767;
  font-size: 14px;
  font-weight: 700;
}

.desktop-nav > a::after,
.desktop-nav > .nav-cluster > .nav-parent::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -9px;
  height: 2px;
  background: var(--teal);
  transition: right .25s var(--ease);
}

.desktop-nav > a:hover,
.desktop-nav > a:focus-visible,
.desktop-nav > .nav-cluster > .nav-parent:hover,
.desktop-nav > .nav-cluster > .nav-parent:focus-visible,
.nav-cluster:hover > .nav-parent,
.nav-cluster[data-nav-open="true"] > .nav-parent {
  color: var(--teal-dark);
}

.desktop-nav > a:hover::after,
.desktop-nav > a:focus-visible::after,
.desktop-nav > .nav-cluster > .nav-parent:hover::after,
.desktop-nav > .nav-cluster > .nav-parent:focus-visible::after,
.nav-cluster:hover > .nav-parent::after,
.nav-cluster[data-nav-open="true"] > .nav-parent::after {
  right: 0;
}

.nav-cluster {
  position: relative;
  height: 72px;
  display: flex;
  align-items: center;
}

.nav-parent {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.nav-caret {
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform .22s var(--ease);
}

.nav-cluster:hover .nav-caret,
.nav-cluster[data-nav-open="true"] .nav-caret {
  transform: translateY(2px) rotate(225deg);
}

.nav-panel {
  position: absolute;
  top: calc(100% - 2px);
  left: 50%;
  width: 280px;
  padding: 12px;
  border: 1px solid rgba(207, 229, 226, .95);
  border-radius: 18px;
  background: rgba(255, 255, 255, .98);
  box-shadow: 0 24px 60px rgba(24, 54, 74, .15);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, 10px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
}

.nav-panel::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -14px;
  height: 14px;
}

.nav-cluster:hover > .nav-panel,
.nav-cluster[data-nav-open="true"] > .nav-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.nav-panel > a,
.home-mega-group > a {
  display: grid;
  gap: 2px;
  padding: 10px 11px;
  border-radius: 11px;
  color: var(--ink);
  white-space: normal;
  transition: color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease);
}

.nav-panel > a:hover,
.nav-panel > a:focus-visible,
.home-mega-group > a:hover,
.home-mega-group > a:focus-visible {
  color: var(--teal-dark);
  background: var(--mint);
  transform: translateX(3px);
}

.nav-panel a strong,
.home-mega-group a strong {
  font-size: 14px;
  line-height: 1.4;
}

.nav-panel a small,
.home-mega-group a small {
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.45;
}

.product-mega {
  left: -210px;
  width: min(780px, calc(100vw - 40px));
  padding: 18px;
  display: grid;
  grid-template-columns: 1.05fr 1fr 1fr;
  gap: 10px;
  transform: translateY(10px);
}

.nav-cluster:hover > .product-mega,
.nav-cluster[data-nav-open="true"] > .product-mega {
  transform: translateY(0);
}

.home-mega-group {
  min-width: 0;
  padding: 0 8px;
}

.home-mega-group + .home-mega-group {
  border-left: 1px solid var(--line);
}

.home-mega-title {
  margin: 0 0 7px;
  padding: 0 11px;
  color: var(--teal-dark);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .08em;
}

.home-mega-foot {
  grid-column: 1 / -1;
  margin-top: 4px;
  padding: 10px 13px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-radius: 12px;
  color: #315966;
  background: var(--mint);
  font-size: 12px;
  font-weight: 700;
}

.home-mega-foot a {
  color: var(--teal-dark);
  font-weight: 900;
}

.home-mega-foot a:hover,
.home-mega-foot a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.nav-cta,
.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--control-radius);
  font-weight: 800;
  white-space: nowrap;
  transition: transform .24s var(--ease), background .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.nav-cta {
  color: var(--white);
  background: var(--teal-dark);
  font-size: 14px;
}

.nav-cta:hover,
.button.primary:hover {
  background: #105c58;
  box-shadow: 0 10px 28px rgba(23, 110, 105, .2);
  transform: translateY(-2px);
}

.nav-cta:active,
.button:active {
  transform: translateY(1px);
}

.menu-toggle,
.mobile-menu {
  display: none;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 54px 0 48px;
  background:
    radial-gradient(circle at 10% 0%, rgba(21, 152, 137, .09), transparent 28%),
    linear-gradient(145deg, var(--paper), var(--sky));
}

.hero::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -230px;
  top: -220px;
  border: 90px solid rgba(21, 152, 137, .045);
  border-radius: 50%;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 630px;
  display: grid;
  grid-template-columns: minmax(520px, .95fr) minmax(0, 1.05fr);
  align-items: center;
  gap: clamp(40px, 5vw, 64px);
}

.hero-copy {
  padding-bottom: 10px;
}

.hero-kicker {
  margin: 0 0 18px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
}

.hero h1 {
  max-width: 690px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(42px, 3.5vw, 52px);
  line-height: 1.12;
  letter-spacing: -.055em;
}

.hero-lead {
  max-width: 560px;
  margin: 24px 0 30px;
  color: #4c6b78;
  font-size: 17px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.button.primary {
  color: var(--white);
  background: var(--teal-dark);
}

.button.secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, .78);
  border-color: #bcd7d3;
}

.button.secondary:hover {
  color: var(--teal-dark);
  border-color: var(--teal);
  background: var(--white);
  transform: translateY(-2px);
}

.hero-visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .8);
  border-radius: 30px;
  background: var(--white);
  box-shadow: var(--shadow);
  animation: hero-in .7s var(--ease) both;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 1.455 / 1;
  object-fit: cover;
}

.hero-visual figcaption,
.selection-visual figcaption {
  position: absolute;
  left: 18px;
  bottom: 14px;
  padding: 7px 10px;
  color: #4f6b76;
  background: rgba(255, 255, 255, .9);
  border-radius: 8px;
  font-size: 11px;
  backdrop-filter: blur(12px);
}

.hero-chain {
  position: absolute;
  left: 28px;
  right: 28px;
  top: 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  padding: 11px 12px;
  color: #345866;
  background: rgba(247, 252, 251, .9);
  border: 1px solid rgba(214, 232, 229, .9);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(24, 82, 87, .08);
  backdrop-filter: blur(12px);
}

.hero-chain span {
  text-align: center;
  font-size: 12px;
  font-weight: 800;
}

.hero-chain b {
  color: var(--teal);
}

.proof-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

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

.proof-grid p {
  margin: 0;
  padding: 22px 26px;
  border-right: 1px solid var(--line);
}

.proof-grid p:first-child {
  border-left: 1px solid var(--line);
}

.proof-grid strong,
.proof-grid span {
  display: block;
}

.proof-grid strong {
  font-size: 15px;
}

.proof-grid span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.section {
  padding: 104px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

.section-heading h2,
.selection-copy h2,
.validation-copy h2,
.inquiry-intro h2,
.faq-layout > h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(32px, 4vw, 50px);
  line-height: 1.2;
  letter-spacing: -.04em;
}

.section-heading p,
.selection-copy > p,
.validation-copy > p,
.inquiry-intro > p {
  max-width: 720px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.products-section {
  background: var(--soft-white);
}

.product-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(360px, .72fr);
  gap: 18px;
}

.product-feature,
.product-compact {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--card-radius);
  transition: transform .28s var(--ease), border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.product-feature:hover,
.product-compact:hover,
.application-card:hover {
  border-color: #9bc9c2;
  box-shadow: var(--shadow-soft);
  transform: translateY(-4px);
}

.product-feature {
  min-height: 560px;
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  align-items: end;
  padding: 48px;
  background:
    radial-gradient(circle at 75% 30%, rgba(255, 255, 255, .88), transparent 30%),
    var(--sky);
}

.product-feature::after {
  content: "";
  position: absolute;
  inset: 24px;
  border: 1px solid rgba(21, 152, 137, .12);
  border-radius: 18px;
  pointer-events: none;
}

.product-feature img {
  position: relative;
  z-index: 1;
  width: min(100%, 480px);
  justify-self: end;
  filter: drop-shadow(0 24px 26px rgba(24, 82, 87, .12));
}

.product-copy {
  position: relative;
  z-index: 2;
  padding-bottom: 18px;
}

.product-copy p,
.product-compact p,
.application-card-main p {
  margin: 0 0 8px;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 800;
}

.product-copy h3,
.product-compact h3 {
  margin: 0;
  font-size: 30px;
  line-height: 1.2;
}

.product-copy strong,
.product-copy span,
.product-copy b,
.product-compact span,
.product-compact b {
  display: block;
}

.product-copy strong {
  margin-top: 20px;
  font-size: 15px;
}

.product-copy span {
  max-width: 350px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.product-copy b,
.product-compact b {
  margin-top: 22px;
  color: var(--teal-dark);
  font-size: 13px;
}

.product-pair {
  display: grid;
  gap: 18px;
}

.product-compact {
  min-height: 271px;
  display: grid;
  grid-template-columns: 42% 58%;
  align-items: center;
  padding: 22px 24px;
  background: var(--white);
}

.product-compact-mint {
  background: var(--mist);
}

.product-compact img {
  width: 100%;
  max-height: 220px;
  object-fit: contain;
  filter: drop-shadow(0 18px 22px rgba(24, 82, 87, .1));
}

.product-compact h3 {
  font-size: 24px;
}

.product-compact span {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

.product-compact b {
  margin-top: 16px;
}

.custom-entry {
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--white);
}

.custom-entry p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.custom-entry strong {
  color: var(--ink);
}

.custom-entry a,
.text-link {
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
}

.applications-section {
  background: var(--mist);
}

.application-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr .8fr;
  grid-auto-rows: 248px;
  gap: 18px;
}

.application-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(214, 232, 229, .9);
  border-radius: var(--card-radius);
  background: var(--white);
  transition: transform .28s var(--ease), border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.application-card-main {
  grid-row: span 2;
}

.application-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s var(--ease);
}

.application-card:hover img {
  transform: scale(1.025);
}

.application-card::after {
  content: "";
  position: absolute;
  inset: 32% 0 0;
  background: linear-gradient(transparent, rgba(10, 41, 53, .82));
}

.application-card > div {
  position: absolute;
  z-index: 2;
  left: 22px;
  right: 22px;
  bottom: 18px;
  color: var(--white);
}

.application-card h3 {
  margin: 0;
  font-size: 22px;
}

.application-card span,
.application-card b {
  display: block;
}

.application-card span {
  margin-top: 4px;
  color: rgba(255, 255, 255, .8);
  font-size: 12px;
}

.application-card b {
  margin-top: 18px;
  font-size: 12px;
}

.application-card-main h3 {
  font-size: 32px;
}

.application-card-main span {
  max-width: 450px;
  font-size: 14px;
}

.selection-section {
  background: var(--paper);
}

.selection-layout {
  display: grid;
  grid-template-columns: minmax(420px, .76fr) minmax(0, 1.24fr);
  align-items: center;
  gap: clamp(48px, 7vw, 100px);
}

.selection-list {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: selection;
}

.selection-list li {
  counter-increment: selection;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.selection-list li::before {
  content: counter(selection, decimal-leading-zero);
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  padding-top: 3px;
}

.selection-list strong,
.selection-list span {
  grid-column: 2;
}

.selection-list strong {
  font-size: 15px;
}

.selection-list span {
  margin-top: -10px;
  color: var(--muted);
  font-size: 12px;
}

.selection-visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--card-radius);
  background: var(--white);
  box-shadow: var(--shadow-soft);
}

.selection-visual > img:first-child {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.selection-product {
  position: absolute;
  width: 43%;
  left: 31%;
  top: 35%;
  filter: drop-shadow(0 18px 22px rgba(24, 82, 87, .16));
}

.validation-section {
  background: var(--sky);
}

.validation-layout {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: clamp(50px, 7vw, 100px);
}

.validation-products {
  position: relative;
  min-height: 520px;
  border: 1px solid rgba(214, 232, 229, .9);
  border-radius: 30px;
  background:
    radial-gradient(circle at 50% 35%, var(--white), transparent 36%),
    var(--mist);
  overflow: hidden;
}

.validation-products img {
  position: absolute;
  object-fit: contain;
  filter: drop-shadow(0 24px 26px rgba(24, 82, 87, .14));
}

.validation-plastic {
  width: 48%;
  left: 5%;
  bottom: 2%;
  transform: rotate(-6deg);
}

.validation-board {
  width: 46%;
  right: 4%;
  top: 3%;
  transform: rotate(8deg);
}

.validation-meter {
  width: 31%;
  right: 16%;
  bottom: 3%;
  transform: rotate(-2deg);
}

.validation-points {
  margin: 32px 0 24px;
  display: grid;
  gap: 12px;
}

.validation-points article {
  display: grid;
  grid-template-columns: 126px 1fr;
  gap: 18px;
  padding: 15px 0;
  border-bottom: 1px solid #cfe3e6;
}

.validation-points strong {
  color: var(--teal-dark);
}

.validation-points span {
  color: var(--muted);
  font-size: 13px;
}

.content-section {
  background: var(--soft-white);
}

.article-list {
  border-top: 1px solid var(--line);
}

.article-list a {
  display: grid;
  grid-template-columns: 110px minmax(280px, 1.1fr) minmax(220px, .9fr) 48px;
  align-items: center;
  gap: 24px;
  padding: 24px 8px;
  border-bottom: 1px solid var(--line);
  transition: padding .24s var(--ease), background .24s var(--ease);
}

.article-list a:hover {
  padding-left: 18px;
  background: var(--mist);
}

.article-list small,
.article-list b {
  color: var(--teal-dark);
  font-size: 12px;
}

.article-list strong {
  font-size: 16px;
}

.article-list span {
  color: var(--muted);
  font-size: 13px;
}

.inquiry-section {
  background: linear-gradient(140deg, #e7f6f3, #edf7fc);
}

.inquiry-layout {
  display: grid;
  grid-template-columns: .72fr 1.28fr;
  align-items: start;
  gap: clamp(48px, 7vw, 100px);
}

.inquiry-intro {
  position: sticky;
  top: 110px;
}

.inquiry-contact {
  display: grid;
  gap: 6px;
  margin-top: 28px;
}

.inquiry-contact a {
  width: fit-content;
  color: var(--ink);
  font-size: 17px;
  font-weight: 800;
}

.wechat-note {
  display: inline-block;
  margin-top: 18px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.inquiry-form {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--card-radius);
  background: rgba(255, 255, 255, .9);
  box-shadow: var(--shadow-soft);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-grid label {
  display: grid;
  gap: 7px;
}

.form-grid label > span {
  color: #365767;
  font-size: 13px;
  font-weight: 800;
}

.form-grid input,
.form-grid textarea {
  width: 100%;
  border: 1px solid #bdd7d3;
  border-radius: var(--control-radius);
  color: var(--ink);
  background: var(--white);
  outline: none;
}

.form-grid input {
  height: 46px;
  padding: 0 13px;
}

.form-grid textarea {
  min-height: 100px;
  padding: 11px 13px;
  resize: vertical;
}

.form-grid input::placeholder,
.form-grid textarea::placeholder {
  color: #8199a2;
}

.form-grid input:focus,
.form-grid textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(21, 152, 137, .13);
}

.form-wide {
  grid-column: 1 / -1;
}

.consent {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin: 18px 0;
  color: var(--muted);
  font-size: 12px;
}

.consent input {
  margin-top: 4px;
}

.consent a {
  color: var(--teal-dark);
  text-decoration: underline;
}

.form-submit {
  width: 100%;
  border: 0;
}

.form-submit:disabled {
  opacity: .62;
  cursor: wait;
}

.form-status {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.inquiry-form.is-success {
  border-color: #83bcb4;
}

.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.faq-section {
  padding: 90px 0;
  background: var(--paper);
}

.faq-layout {
  display: grid;
  grid-template-columns: .62fr 1.38fr;
  gap: clamp(48px, 7vw, 100px);
  align-items: start;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  padding: 22px 42px 22px 0;
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
}

.faq-list p {
  max-width: 720px;
  margin: -6px 0 22px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  color: rgba(255, 255, 255, .68);
  background: var(--navy);
}

.footer-grid {
  padding: 58px 0 42px;
  display: grid;
  grid-template-columns: 1.45fr repeat(3, .75fr);
  gap: 48px;
}

.site-footer .brand {
  color: var(--white);
}

.site-footer .brand small {
  color: rgba(255, 255, 255, .52);
}

.footer-brand p {
  max-width: 430px;
  margin: 18px 0 0;
  font-size: 13px;
}

.footer-grid h2 {
  margin: 0 0 14px;
  color: var(--white);
  font-size: 14px;
}

.footer-grid > div:not(.footer-brand) a {
  display: block;
  margin-top: 9px;
  font-size: 12px;
}

.footer-grid a:hover {
  color: var(--white);
}

.footer-bottom {
  padding: 18px 0 24px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  font-size: 11px;
}

[data-reveal].is-visible {
  animation: reveal .65s var(--ease) both;
}

@keyframes hero-in {
  from { opacity: 0; transform: translateY(18px) scale(.985); }
  to { opacity: 1; transform: none; }
}

@keyframes reveal {
  from { opacity: .35; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 1100px) {
  .nav-shell {
    gap: 20px;
  }

  .desktop-nav {
    gap: 14px;
  }

  .desktop-nav a {
    font-size: 13px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, .9fr) minmax(460px, 1.1fr);
    gap: 36px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .product-feature {
    padding: 36px;
  }

  .application-grid {
    grid-template-columns: 1fr 1fr;
  }

  .application-card-main {
    grid-column: span 2;
    grid-row: span 1;
  }
}

@media (max-width: 900px) {
  .shell {
    width: min(100% - 36px, var(--shell));
  }

  .nav-shell {
    grid-template-columns: 1fr auto;
  }

  .desktop-nav,
  .nav-cta {
    display: none;
  }

  .menu-toggle {
    width: 42px;
    height: 42px;
    display: grid;
    place-content: center;
    gap: 6px;
    border: 1px solid var(--line);
    border-radius: var(--control-radius);
    background: var(--white);
  }

  .menu-toggle:focus-visible {
    outline: 3px solid rgba(21, 152, 137, .2);
    border-color: var(--teal);
  }

  .menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--ink);
    transition: transform .25s var(--ease);
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }

  .mobile-menu {
    position: fixed;
    inset: 72px 0 auto;
    max-height: calc(100dvh - 72px);
    padding: 18px;
    display: grid;
    gap: 2px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
    transform: translateY(-115%);
    opacity: 0;
    visibility: hidden;
    transition: transform .3s var(--ease), opacity .3s var(--ease), visibility .3s;
  }

  .mobile-menu[aria-hidden="false"] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-menu a {
    padding: 12px 10px;
    border-bottom: 1px solid var(--line);
    font-size: 15px;
    font-weight: 800;
  }

  .mobile-menu-cta {
    margin-top: 10px;
    color: var(--white);
    background: var(--teal-dark);
    border: 0 !important;
    border-radius: var(--control-radius);
    text-align: center;
  }

  .hero {
    padding: 40px 0 46px;
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .hero h1 {
    max-width: 720px;
    font-size: clamp(42px, 7vw, 58px);
  }

  .hero-lead {
    max-width: 660px;
  }

  .hero-visual {
    max-width: 720px;
  }

  .proof-grid {
    grid-template-columns: 1fr 1fr;
  }

  .proof-grid p:nth-child(3) {
    border-left: 1px solid var(--line);
  }

  .proof-grid p:nth-child(-n+2) {
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 82px 0;
  }

  .product-layout,
  .selection-layout,
  .validation-layout,
  .inquiry-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .product-feature {
    min-height: 500px;
  }

  .product-pair {
    grid-template-columns: 1fr 1fr;
  }

  .product-compact {
    min-height: 330px;
    grid-template-columns: 1fr;
  }

  .product-compact img {
    height: 180px;
  }

  .selection-layout,
  .validation-layout,
  .faq-layout {
    gap: 44px;
  }

  .validation-copy {
    order: -1;
  }

  .inquiry-intro {
    position: static;
  }

  .article-list a {
    grid-template-columns: 96px 1fr 42px;
  }

  .article-list span {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 28px, var(--shell));
  }

  .nav-shell {
    height: 64px;
  }

  .brand {
    font-size: 17px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }

  .mobile-menu {
    inset: 64px 0 auto;
  }

  .hero {
    padding: 32px 0 36px;
  }

  .hero-grid {
    gap: 26px;
  }

  .hero-kicker {
    margin-bottom: 12px;
    font-size: 11px;
  }

  .hero h1 {
    font-size: clamp(30px, 8.5vw, 36px);
    line-height: 1.16;
  }

  .hero-lead {
    margin: 18px 0 24px;
    font-size: 15px;
    line-height: 1.75;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .button {
    min-height: 44px;
    padding-inline: 12px;
    font-size: 14px;
  }

  .hero-visual {
    border-radius: 20px;
  }

  .hero-visual img {
    aspect-ratio: 4 / 5;
  }

  .hero-chain {
    left: 10px;
    right: 10px;
    top: 10px;
    padding: 8px 6px;
  }

  .hero-chain span {
    font-size: 10px;
  }

  .hero-visual figcaption {
    left: 10px;
    bottom: 10px;
    max-width: calc(100% - 20px);
    font-size: 9px;
  }

  .proof-grid {
    grid-template-columns: 1fr;
  }

  .proof-grid p,
  .proof-grid p:first-child,
  .proof-grid p:nth-child(3) {
    padding: 15px 18px;
    border-left: 1px solid var(--line);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 66px 0;
  }

  .section-heading {
    margin-bottom: 28px;
  }

  .section-heading h2,
  .selection-copy h2,
  .validation-copy h2,
  .inquiry-intro h2,
  .faq-layout > h2 {
    font-size: 32px;
  }

  .product-layout {
    gap: 14px;
  }

  .product-feature {
    min-height: 510px;
    grid-template-columns: 1fr;
    padding: 28px 24px;
  }

  .product-feature img {
    width: 86%;
    align-self: end;
    justify-self: center;
  }

  .product-copy {
    align-self: start;
  }

  .product-copy h3 {
    font-size: 28px;
  }

  .product-pair {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .product-compact {
    min-height: 245px;
    grid-template-columns: 42% 58%;
    padding: 16px;
  }

  .product-compact img {
    height: 180px;
  }

  .product-compact h3 {
    font-size: 21px;
  }

  .custom-entry {
    display: block;
    padding: 18px;
  }

  .custom-entry a {
    display: inline-block;
    margin-top: 12px;
  }

  .application-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: 250px;
    gap: 14px;
  }

  .application-card-main {
    grid-column: auto;
    min-height: 390px;
  }

  .application-card h3 {
    font-size: 24px;
  }

  .selection-list li {
    grid-template-columns: 34px 1fr;
  }

  .selection-visual {
    border-radius: 18px;
  }

  .selection-visual > img:first-child {
    aspect-ratio: 4 / 3;
  }

  .selection-product {
    width: 50%;
    left: 25%;
    top: 34%;
  }

  .selection-visual figcaption {
    left: 9px;
    bottom: 9px;
    font-size: 9px;
  }

  .validation-products {
    min-height: 380px;
    border-radius: 20px;
  }

  .validation-points article {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .article-list a {
    grid-template-columns: 1fr 34px;
    gap: 8px;
    padding: 18px 4px;
  }

  .article-list small {
    grid-column: 1;
  }

  .article-list strong {
    grid-column: 1;
  }

  .article-list b {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
  }

  .inquiry-form {
    padding: 22px 18px;
    border-radius: 18px;
  }

  .form-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .form-wide {
    grid-column: auto;
  }

  .faq-section {
    padding: 66px 0;
  }

  .faq-layout {
    gap: 24px;
  }

  .footer-grid {
    padding: 44px 0 34px;
    grid-template-columns: 1fr 1fr;
    gap: 32px 22px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header,
  .hero-chain,
  .hero-visual figcaption,
  .selection-visual figcaption {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}