:root {
  --ink: #102b34;
  --muted: #52666d;
  --paper: #f6fafb;
  --white: #ffffff;
  --line: #d7e3e7;
  --aqua: #0e8796;
  --aqua-dark: #08616d;
  --orange: #e56f2d;
  --orange-soft: #fff0e6;
  --blue-soft: #e8f5f7;
  --shadow: 0 18px 50px rgba(16, 43, 52, 0.09);
  --radius: 22px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; }
.skip-link { position: absolute; top: -100px; left: 1rem; padding: .7rem 1rem; background: var(--ink); color: white; z-index: 30; }
.skip-link:focus { top: 1rem; }
.container { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(215,227,231,.9); backdrop-filter: blur(16px); }
.nav { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 1.25rem; }
.brand { display: inline-flex; align-items: center; gap: .72rem; text-decoration: none; font-weight: 800; letter-spacing: .08em; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px 12px 12px 4px; color: white; background: linear-gradient(145deg, var(--aqua), var(--aqua-dark)); font-size: .88rem; letter-spacing: -.02em; }
.brand small { display: block; color: var(--muted); font-weight: 600; letter-spacing: .08em; font-size: .68rem; line-height: 1.2; }
.nav-links { display: flex; align-items: center; gap: 1.25rem; list-style: none; padding: 0; margin: 0; font-size: .92rem; font-weight: 650; }
.nav-links a { text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--aqua-dark); }
.lang-link { padding: .42rem .7rem; border: 1px solid var(--line); border-radius: 999px; }
.menu-button { display: none; border: 0; background: transparent; padding: .5rem; color: var(--ink); }
.menu-button svg { width: 28px; height: 28px; }

.hero { overflow: hidden; background: linear-gradient(145deg, #eff9fa 0%, #ffffff 58%, #fff5ee 100%); }
.hero-grid { min-height: 650px; padding: 5.7rem 0 4.8rem; display: grid; grid-template-columns: 1.16fr .84fr; align-items: center; gap: 4rem; }
.eyebrow { display: inline-flex; align-items: center; gap: .55rem; color: var(--aqua-dark); font-size: .79rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 800; }
.eyebrow::before { content: ""; width: 28px; height: 3px; border-radius: 9px; background: var(--orange); }
h1, h2, h3 { line-height: 1.16; margin: 0; text-wrap: balance; }
h1 { margin-top: 1.2rem; font-size: clamp(2.55rem, 5vw, 5.4rem); letter-spacing: -.055em; max-width: 13ch; }
.hero h1 span { color: var(--aqua-dark); }
.hero-lead { max-width: 650px; margin: 1.55rem 0 0; color: var(--muted); font-size: clamp(1.08rem, 1.5vw, 1.28rem); }
.actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .72rem 1.15rem; border-radius: 12px; text-decoration: none; font-weight: 750; border: 1px solid transparent; }
.button.primary { color: white; background: var(--aqua-dark); box-shadow: 0 10px 25px rgba(8,97,109,.2); }
.button.secondary { background: white; border-color: var(--line); }
.button:hover { transform: translateY(-1px); }
.hero-visual { position: relative; min-height: 440px; }
.hero-orbit { position: absolute; inset: 0; border: 1px solid rgba(14,135,150,.2); border-radius: 50%; transform: rotate(-12deg); }
.hero-card { position: absolute; background: rgba(255,255,255,.96); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.hero-card.main { inset: 4% 4% 12% 7%; display: grid; place-items: center; padding: 2rem; transform: rotate(2deg); }
.hero-card.main img { width: 90%; }
.hero-card.note { left: -3%; bottom: 4%; max-width: 250px; padding: 1.1rem 1.25rem; transform: rotate(-3deg); }
.hero-card.note strong { display: block; font-size: .92rem; }
.hero-card.note span { display: block; margin-top: .25rem; color: var(--muted); font-size: .82rem; line-height: 1.5; }
.proof-strip { border-block: 1px solid var(--line); background: var(--paper); }
.proof-grid { display: grid; grid-template-columns: repeat(4,1fr); }
.proof-item { padding: 1.2rem 1.3rem; border-right: 1px solid var(--line); }
.proof-item:last-child { border-right: 0; }
.proof-item strong { display: block; font-size: .9rem; }
.proof-item span { color: var(--muted); font-size: .8rem; }

section { padding: 6rem 0; }
.section-soft { background: var(--paper); }
.section-head { display: grid; grid-template-columns: .72fr 1.28fr; gap: 3rem; align-items: end; margin-bottom: 2.5rem; }
.section-head h2 { font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -.045em; }
.section-head p { margin: 0; color: var(--muted); max-width: 670px; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card { background: white; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.45rem; text-decoration: none; transition: transform .18s ease, box-shadow .18s ease; }
a.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-number { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: var(--aqua-dark); background: var(--blue-soft); font-size: .8rem; font-weight: 800; }
.card h3 { margin-top: 1rem; font-size: 1.18rem; }
.card p { margin: .65rem 0 0; color: var(--muted); font-size: .94rem; }
.card-link { display: inline-block; margin-top: 1rem; color: var(--aqua-dark); font-size: .88rem; font-weight: 750; }
.method { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: white; }
.method-item { min-height: 220px; padding: 1.6rem; border-right: 1px solid var(--line); }
.method-item:last-child { border: 0; }
.method-item b { color: var(--orange); font-size: .78rem; letter-spacing: .12em; }
.method-item h3 { margin-top: 2.4rem; font-size: 1.2rem; }
.method-item p { color: var(--muted); font-size: .9rem; margin: .55rem 0 0; }
.product-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; }
.product-card { grid-column: span 4; display: flex; min-height: 350px; flex-direction: column; overflow: hidden; padding: 0; }
.product-card.featured { grid-column: span 8; flex-direction: row; }
.product-image { min-height: 205px; display: grid; place-items: center; padding: 1.5rem; background: linear-gradient(145deg,#f8fbfc,#eaf4f5); }
.product-image img { max-height: 230px; width: auto; object-fit: contain; }
.product-card.featured .product-image { width: 54%; }
.product-copy { padding: 1.4rem; flex: 1; }
.product-copy h3 { font-size: 1.28rem; }
.product-copy p { color: var(--muted); font-size: .92rem; margin: .55rem 0 0; }
.evidence { background: var(--ink); color: white; }
.evidence .section-head p { color: #bed0d5; }
.evidence .eyebrow { color: #9ee1e7; }
.evidence-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.evidence-card { border: 1px solid rgba(255,255,255,.18); border-radius: var(--radius); padding: 1.4rem; background: rgba(255,255,255,.04); }
.evidence-card small { color: #8fd6de; font-weight: 750; }
.evidence-card h3 { margin-top: .8rem; }
.evidence-card p { color: #c6d7db; font-size: .9rem; }
.evidence-card .status { display: inline-block; margin-top: .8rem; padding: .28rem .55rem; border-radius: 999px; color: #ffd3b9; background: rgba(229,111,45,.18); font-size: .75rem; font-weight: 750; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.feature-panel { border-radius: var(--radius); padding: 2rem; background: var(--blue-soft); }
.feature-panel.orange { background: var(--orange-soft); }
.feature-panel h2 { font-size: clamp(1.65rem,3vw,2.5rem); }
.feature-panel p { color: var(--muted); }
.source-note { padding: 1rem 1.2rem; border-left: 4px solid var(--orange); background: var(--orange-soft); color: #5d4434; font-size: .88rem; }

.page-hero { padding: 5rem 0 3.5rem; background: linear-gradient(145deg,#eff9fa,#fff); border-bottom: 1px solid var(--line); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: .45rem; color: var(--muted); font-size: .78rem; }
.breadcrumbs a { text-decoration: none; }
.page-hero h1 { margin-top: 1.4rem; max-width: 18ch; font-size: clamp(2.35rem,5vw,4.8rem); }
.page-lead { max-width: 760px; color: var(--muted); font-size: 1.16rem; margin: 1.2rem 0 0; }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 4rem; }
.prose { max-width: 760px; }
.prose h2 { margin-top: 3rem; font-size: clamp(1.7rem,3vw,2.4rem); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 2rem; font-size: 1.25rem; }
.prose p, .prose li { color: #3c535b; }
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose figure { margin: 2.5rem 0; }
.prose figcaption { margin-top: .7rem; color: var(--muted); font-size: .82rem; }
.prose table { width: 100%; border-collapse: collapse; margin: 2rem 0; font-size: .9rem; }
.prose th, .prose td { border-bottom: 1px solid var(--line); padding: .85rem .75rem; text-align: left; vertical-align: top; }
.prose th { background: var(--paper); }
.side-card { position: sticky; top: 104px; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem; align-self: start; }
.side-card h2 { font-size: 1.25rem; }
.side-card p { color: var(--muted); font-size: .9rem; }
.checklist { list-style: none; padding: 0; margin: 1rem 0 0; }
.checklist li { position: relative; padding: .65rem 0 .65rem 1.5rem; border-top: 1px solid var(--line); font-size: .88rem; }
.checklist li::before { content: ""; position: absolute; left: .1rem; top: 1.12rem; width: 7px; height: 7px; border-radius: 50%; background: var(--aqua); }
.product-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 1rem; }
.product-detail { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); }
.product-detail .product-image { min-height: 250px; }
.product-detail .product-copy { padding: 1.5rem; }
.tag-list { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.tag { padding: .3rem .6rem; border-radius: 999px; background: var(--paper); border: 1px solid var(--line); color: var(--muted); font-size: .76rem; }
.article-list { display: grid; gap: .8rem; }
.article-row { display: grid; grid-template-columns: 150px 1fr auto; gap: 1.3rem; align-items: center; padding: 1.2rem 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.article-row small { color: var(--muted); }
.article-row strong { font-size: 1.08rem; }
.article-row span { color: var(--aqua-dark); font-weight: 750; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: grid; gap: .4rem; }
.field.full { grid-column: 1/-1; }
.field label { font-size: .86rem; font-weight: 700; }
.field input, .field select, .field textarea { width: 100%; padding: .82rem .9rem; color: var(--ink); background: white; border: 1px solid #bfd0d5; border-radius: 10px; }
.field textarea { min-height: 135px; resize: vertical; }
.form-note { margin-top: 1rem; color: var(--muted); font-size: .82rem; }
.contact-card { padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); }
.contact-card a { color: var(--aqua-dark); }

.cta { background: var(--orange-soft); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.cta h2 { font-size: clamp(1.8rem,3.5vw,3rem); max-width: 18ch; }
.site-footer { padding: 3.2rem 0 1.6rem; color: #c5d4d8; background: #0b252d; }
.footer-grid { display: grid; grid-template-columns: 1.1fr .9fr .9fr; gap: 2rem; }
.site-footer .brand { color: white; }
.site-footer p { color: #a9bdc2; max-width: 430px; font-size: .9rem; }
.footer-links { list-style: none; padding: 0; margin: .7rem 0 0; }
.footer-links li { margin: .42rem 0; }
.footer-links a { color: #c5d4d8; text-decoration: none; font-size: .88rem; }
.footer-bottom { margin-top: 2.5rem; padding-top: 1.2rem; border-top: 1px solid rgba(255,255,255,.12); display: flex; justify-content: space-between; gap: 1rem; color: #8ca4aa; font-size: .75rem; }

@media (max-width: 920px) {
  .menu-button { display: inline-flex; }
  .nav-links { position: absolute; top: 78px; left: 0; right: 0; display: grid; gap: 0; background: white; border-bottom: 1px solid var(--line); padding: .5rem 1rem 1rem; }
  .nav-links[hidden] { display: none; }
  .nav-links li a { display: block; padding: .7rem .25rem; }
  .hero-grid { min-height: auto; grid-template-columns: 1fr; gap: 2.5rem; padding-top: 4.2rem; }
  .hero-visual { min-height: 390px; max-width: 620px; width: 100%; margin-inline: auto; }
  .proof-grid { grid-template-columns: 1fr 1fr; }
  .proof-item:nth-child(2) { border-right: 0; }
  .proof-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section-head { grid-template-columns: 1fr; gap: .9rem; }
  .card-grid, .evidence-grid { grid-template-columns: 1fr 1fr; }
  .method { grid-template-columns: 1fr 1fr; }
  .method-item:nth-child(2) { border-right: 0; }
  .method-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .product-card, .product-card.featured { grid-column: span 6; flex-direction: column; }
  .product-card.featured .product-image { width: 100%; }
  .content-grid { grid-template-columns: 1fr; gap: 2rem; }
  .side-card { position: static; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .container { width: min(calc(100% - 1.25rem), var(--max)); }
  .brand small { display: none; }
  .hero-grid { padding: 3.3rem 0 3rem; }
  .hero-visual { min-height: 300px; }
  .hero-card.main { inset: 4% 0 15% 5%; padding: 1.2rem; }
  .hero-card.note { left: 0; max-width: 215px; }
  section { padding: 4.2rem 0; }
  .card-grid, .evidence-grid, .split, .product-list, .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .method { grid-template-columns: 1fr; }
  .method-item { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .method-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .method-item h3 { margin-top: 1.2rem; }
  .product-card, .product-card.featured { grid-column: 1/-1; }
  .article-row { grid-template-columns: 1fr; gap: .2rem; }
  .cta-inner, .footer-bottom { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}