:root {
  --ink: #102526;
  --muted: #617172;
  --paper: #f6f8f4;
  --white: #ffffff;
  --teal: #0c4a49;
  --teal-deep: #082f30;
  --mint: #bfe7d6;
  --line: #d7dfda;
  --warm: #e8d8bc;
  --shadow: 0 24px 70px rgba(9, 43, 43, .12);
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 99; background: var(--white); padding: 10px 14px; border-radius: 6px; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(246, 248, 244, .88);
  border-bottom: 1px solid rgba(16, 37, 38, .08);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; line-height: 1.05; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: var(--white); background: var(--teal); border-radius: 50%; font: 700 18px/1 Georgia, serif; }
.brand b { display: block; font-size: 14px; letter-spacing: .02em; }
.brand small { display: block; margin-top: 5px; color: var(--muted); font-size: 11px; letter-spacing: .18em; }
nav { display: flex; align-items: center; gap: 28px; }
nav a { color: #425556; font-size: 13px; font-weight: 600; text-decoration: none; }
nav a:hover { color: var(--teal); }
.nav-cta { padding: 9px 15px; color: var(--white) !important; background: var(--teal); border-radius: 6px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(340px, .72fr);
  align-items: center;
  gap: clamp(48px, 8vw, 112px);
  max-width: var(--max);
  min-height: calc(100vh - 76px);
  margin: 0 auto;
  padding: 72px 24px 92px;
}
.kicker, .section-label { margin: 0 0 18px; color: var(--teal); font-size: 12px; font-weight: 750; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3, p { text-wrap: pretty; }
h1 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(46px, 6.1vw, 84px); font-weight: 500; letter-spacing: -.045em; line-height: 1.08; }
h1 em { color: var(--teal); font-style: normal; }
.hero-lead { max-width: 690px; margin: 34px 0 0; color: #445657; font-size: clamp(17px, 1.5vw, 20px); line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 48px; padding: 11px 19px; border: 1px solid transparent; border-radius: 6px; font-size: 14px; font-weight: 700; text-decoration: none; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: var(--white); background: var(--teal); }
.button.primary:hover { background: var(--teal-deep); }
.button.secondary { border-color: #b8c3bd; background: transparent; }
.button.secondary:hover { border-color: var(--teal); }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; max-width: 670px; margin: 50px 0 0; padding-top: 23px; border-top: 1px solid var(--line); }
.hero-facts div { min-width: 0; }
.hero-facts dt { font: 600 22px/1.2 Georgia, "Songti SC", serif; }
.hero-facts dd { margin: 8px 0 0; color: var(--muted); font-size: 12px; line-height: 1.55; }
.hero-visual { position: relative; margin: 0; }
.hero-visual img { width: min(100%, 410px); margin-left: auto; border-radius: 3px; box-shadow: var(--shadow); transform: rotate(1.5deg); }
.paper-label { position: absolute; top: 18px; left: 6px; z-index: 2; padding: 8px 12px; color: var(--teal-deep); background: var(--mint); border-radius: 4px; font-size: 11px; font-weight: 750; letter-spacing: .08em; transform: rotate(-2deg); }
.hero-visual figcaption { max-width: 360px; margin: 24px 0 0 auto; color: var(--muted); font-size: 12px; text-align: right; }

.statement { padding: 90px 24px; color: var(--white); background: var(--teal-deep); }
.statement p { max-width: 980px; margin: 0 auto; font: 400 clamp(28px, 4.2vw, 52px)/1.35 Georgia, "Songti SC", serif; }

.section { max-width: var(--max); margin: 0 auto; padding: 120px 24px; }
.split { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(300px, .72fr); align-items: center; gap: clamp(56px, 9vw, 120px); }
.section h2 { max-width: 920px; margin: 0 0 26px; font: 500 clamp(34px, 4.4vw, 58px)/1.18 Georgia, "Songti SC", serif; letter-spacing: -.035em; }
.section-copy > p:not(.section-label), .section-heading > p:not(.section-label) { color: #4c5e5f; font-size: 17px; }
.timeline { position: relative; display: grid; gap: 0; margin: 36px 0 0; padding: 0; list-style: none; }
.timeline::before { content: ""; position: absolute; left: 64px; top: 20px; bottom: 20px; width: 1px; background: #b8c8c2; }
.timeline li { position: relative; display: grid; grid-template-columns: 112px 1fr; align-items: start; min-height: 72px; }
.timeline li::before { content: ""; position: absolute; left: 60px; top: 11px; width: 9px; height: 9px; background: var(--teal); border: 3px solid var(--paper); border-radius: 50%; }
.timeline b { color: var(--teal); font-size: 13px; letter-spacing: .02em; }
.timeline span { color: #405354; font-size: 14px; }
.document-preview { position: relative; margin: 0; padding: 0; overflow: hidden; cursor: zoom-in; background: var(--white); border: 0; border-radius: 3px; box-shadow: var(--shadow); transform: rotate(.8deg); }
.document-preview img { width: 100%; }
.document-preview > span { position: absolute; right: 12px; bottom: 12px; padding: 6px 10px; color: var(--white); background: rgba(8, 47, 48, .86); border-radius: 4px; font-size: 11px; }
.document-preview:focus-visible { outline: 3px solid var(--teal); outline-offset: 5px; }

.ai-section { max-width: none; color: var(--white); background: #0a3637; }
.ai-section > * { max-width: var(--max); margin-left: auto; margin-right: auto; }
.ai-section .section-label { color: var(--mint); }
.ai-section h2 { max-width: 990px; }
.ai-flow { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 64px; border-top: 1px solid rgba(255,255,255,.2); border-bottom: 1px solid rgba(255,255,255,.2); }
.ai-flow article { min-height: 270px; padding: 30px 26px 34px; border-left: 1px solid rgba(255,255,255,.2); }
.ai-flow article:last-child { border-right: 1px solid rgba(255,255,255,.2); }
.ai-flow article span { color: var(--mint); font: 500 34px/1 Georgia, serif; }
.ai-flow h3 { margin: 46px 0 14px; font-size: 17px; }
.ai-flow p { margin: 0; color: #c7d3d0; font-size: 13px; line-height: 1.75; }
.evidence-note { display: grid; grid-template-columns: .7fr 1.3fr; gap: 56px; align-items: start; margin-top: 50px; padding: 0 4px; }
.evidence-note b { font: 500 25px/1.4 Georgia, "Songti SC", serif; }
.evidence-note p { margin: 0; color: #c7d3d0; font-size: 14px; }

.safety-section { display: grid; grid-template-columns: 1fr minmax(270px, .52fr); align-items: center; gap: clamp(52px, 9vw, 120px); }
.safety-card { padding: clamp(34px, 5vw, 68px); background: var(--white); border: 1px solid var(--line); border-radius: 4px; box-shadow: 0 18px 50px rgba(16,37,38,.06); }
.safety-card h2 { font-size: clamp(34px, 4vw, 51px); }
.safety-card > p:not(.section-label) { color: #4c5e5f; }
.guardrails { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px; margin: 32px 0 0; padding: 28px 0 0; border-top: 1px solid var(--line); list-style: none; }
.guardrails li { position: relative; padding-left: 18px; color: #405354; font-size: 13px; }
.guardrails li::before { content: ""; position: absolute; left: 0; top: .75em; width: 6px; height: 6px; background: var(--teal); border-radius: 50%; }
.document-preview.compact { max-width: 350px; justify-self: end; transform: rotate(-1deg); }

.validation-section { border-top: 1px solid var(--line); }
.validation-section .section-heading { display: grid; grid-template-columns: 1.05fr .95fr; column-gap: 80px; align-items: end; }
.validation-section .section-heading .section-label { grid-column: 1 / -1; }
.validation-section .section-heading h2 { margin-bottom: 0; }
.validation-section .section-heading > p:last-child { margin: 0; }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 70px; background: var(--line); border: 1px solid var(--line); }
.metric-grid article { min-height: 210px; padding: 30px; background: var(--paper); }
.metric-grid strong { display: block; color: var(--teal); font: 500 52px/1 Georgia, serif; }
.metric-grid span { display: block; margin-top: 29px; font-weight: 700; }
.metric-grid small { display: block; margin-top: 8px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.status-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 64px; }
.status-grid article { padding: 30px; border-top: 4px solid var(--line); background: var(--white); }
.status-grid .done { border-color: #4e8e76; }
.status-grid .next { border-color: #c7a35e; }
.status-grid .confirm { border-color: #87989a; }
.status-grid p { margin: 0 0 20px; font-weight: 750; }
.status-grid ul { margin: 0; padding-left: 18px; color: #556768; font-size: 13px; }
.status-grid li + li { margin-top: 7px; }

.closing { display: grid; grid-template-columns: 1.3fr .7fr; align-items: end; gap: 70px; padding: 100px max(24px, calc((100vw - var(--max)) / 2)); color: var(--white); background: var(--teal); }
.closing .section-label { color: var(--mint); }
.closing h2 { max-width: 860px; margin: 0; font: 500 clamp(34px, 4.2vw, 58px)/1.23 Georgia, "Songti SC", serif; letter-spacing: -.03em; }
.closing p:not(.section-label) { color: #c9d9d5; }
.closing-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 20px; }
.button.light { color: var(--teal-deep); background: var(--white); }
.text-link { color: var(--mint); font-size: 13px; font-weight: 700; text-underline-offset: 5px; }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 28px max(24px, calc((100vw - var(--max)) / 2)); color: #bcd0cc; background: var(--teal-deep); font-size: 11px; letter-spacing: .04em; }
footer p { margin: 0; }

.lightbox { width: min(92vw, 820px); max-height: 92vh; padding: 0; overflow: visible; background: transparent; border: 0; }
.lightbox::backdrop { background: rgba(2, 18, 19, .86); backdrop-filter: blur(10px); }
.lightbox img { max-height: 90vh; margin: auto; border-radius: 2px; box-shadow: 0 30px 100px rgba(0,0,0,.4); }
.lightbox-close { position: fixed; top: 20px; right: 24px; width: 42px; height: 42px; cursor: pointer; color: var(--white); background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.4); border-radius: 50%; font-size: 26px; line-height: 1; }

@media (max-width: 900px) {
  nav a:not(.nav-cta) { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 70px; }
  .hero-visual { max-width: 430px; margin: 20px auto 0; }
  .split, .safety-section { grid-template-columns: 1fr; }
  .document-preview { max-width: 420px; margin: 0 auto; }
  .document-preview.compact { justify-self: center; }
  .ai-flow { grid-template-columns: 1fr 1fr; }
  .ai-flow article:nth-child(2) { border-right: 1px solid rgba(255,255,255,.2); }
  .validation-section .section-heading { grid-template-columns: 1fr; gap: 20px; }
  .metric-grid { grid-template-columns: 1fr 1fr; }
  .status-grid { grid-template-columns: 1fr; }
  .closing { grid-template-columns: 1fr; align-items: start; }
}

@media (max-width: 600px) {
  .site-header { height: 66px; padding-inline: 18px; }
  .brand small { display: none; }
  .nav-cta { padding: 8px 12px; }
  .hero { padding: 54px 18px 74px; }
  h1 { font-size: clamp(41px, 12vw, 58px); }
  .hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-facts { grid-template-columns: 1fr; gap: 14px; }
  .hero-facts div { display: grid; grid-template-columns: 80px 1fr; align-items: baseline; gap: 10px; }
  .hero-facts dd { margin: 0; }
  .statement, .section { padding: 76px 18px; }
  .statement p { font-size: 29px; }
  .section h2 { font-size: 36px; }
  .timeline::before { left: 54px; }
  .timeline li { grid-template-columns: 90px 1fr; }
  .timeline li::before { left: 50px; }
  .ai-flow { grid-template-columns: 1fr; }
  .ai-flow article, .ai-flow article:nth-child(2), .ai-flow article:last-child { min-height: 0; border-right: 1px solid rgba(255,255,255,.2); border-bottom: 1px solid rgba(255,255,255,.2); }
  .ai-flow h3 { margin-top: 24px; }
  .evidence-note { grid-template-columns: 1fr; gap: 20px; }
  .safety-card { padding: 30px 24px; }
  .guardrails { grid-template-columns: 1fr; }
  .metric-grid { grid-template-columns: 1fr; }
  .metric-grid article { min-height: 170px; }
  .status-grid article { padding: 24px; }
  .closing { padding: 76px 18px; }
  footer { flex-direction: column; padding: 26px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media (prefers-color-scheme: dark) {
  :root { --ink: #e6efeb; --muted: #9fb1ad; --paper: #0d1b1c; --white: #132627; --teal: #70c5aa; --line: #2b3e3d; --shadow: 0 24px 70px rgba(0,0,0,.36); }
  body { color: var(--ink); }
  .site-header { background: rgba(13, 27, 28, .9); border-color: rgba(255,255,255,.08); }
  nav a, .hero-lead, .section-copy > p:not(.section-label), .section-heading > p:not(.section-label), .timeline span, .safety-card > p:not(.section-label), .guardrails li { color: #b6c7c3; }
  .timeline li::before { border-color: var(--paper); }
  .safety-card, .status-grid article { background: #132627; }
  .metric-grid article { background: var(--paper); }
  .button.secondary { border-color: #516461; }
  .button.primary, .nav-cta { color: #082f30 !important; }
  .paper-label { color: #082f30; }
}