:root {
  --paper: #ede5d4;
  --paper-light: #f6f0e3;
  --paper-deep: #e7dbcb;
  --ink: #11110f;
  --muted: #595852;
  --blue: #053a8c;
  --blue-deep: #03295f;
  --green: #155318;
  --line: rgba(17,17,15,.22);
  --header-height: 76px;
  --max: 1560px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 20px); }
body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(5,58,140,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(5,58,140,.045) 1px, transparent 1px),
    radial-gradient(circle at 18% 10%, rgba(255,255,255,.5), transparent 38%);
  background-size: 80px 80px, 80px 80px, 100% 100%;
  font-family: "Microsoft YaHei UI", "Noto Sans SC", "PingFang SC", sans-serif;
  line-height: 1.65;
  overflow-x: clip;
}
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { color: inherit; }
figure, h1, h2, h3, p { margin: 0; }
address { font-style: normal; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; z-index: 999; top: 8px; left: 8px; padding: 10px 16px;
  color: #fff; background: var(--blue); transform: translateY(-140%);
}
.skip-link:focus { transform: none; }
:focus-visible { outline: 3px solid #0a2a66; outline-offset: 4px; }
.button:focus-visible, .menu-toggle:focus-visible, .menu-close:focus-visible { outline-color: #fff; box-shadow: 0 0 0 6px #0a2a66; }

.site-header {
  position: sticky; z-index: 50; top: 0; min-height: var(--header-height);
  display: grid; grid-template-columns: minmax(280px,1fr) auto; align-items: center;
  max-width: var(--max); margin: 0 auto; padding: 0 32px;
  border-bottom: 1px solid var(--blue); background: rgba(237,229,212,.95);
  backdrop-filter: blur(12px);
}
.brand { display: inline-flex; align-items: center; gap: 13px; width: fit-content; font-size: 19px; font-weight: 800; letter-spacing: -.02em; }
.brand-mark { width: 38px; height: 38px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 3; stroke-linecap: square; stroke-linejoin: miter; }
.desktop-nav { display: flex; align-self: stretch; }
.desktop-nav a { position: relative; display: flex; align-items: center; padding: 0 22px; font-size: 14px; font-weight: 650; }
.desktop-nav a::after { content: ""; position: absolute; left: 22px; right: 22px; bottom: -1px; height: 3px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .25s ease; }
.desktop-nav a:hover::after, .desktop-nav a:focus-visible::after { transform: scaleX(1); }
.menu-toggle { display: none; width: 48px; height: 48px; padding: 13px; border: 0; background: var(--blue); cursor: pointer; }
.menu-toggle span:not(.sr-only) { display: block; height: 2px; margin: 6px 0; background: #fff; }
.mobile-menu, .menu-backdrop { display: none; }
.menu-backdrop[hidden] { display: none !important; }

main, .site-footer { max-width: var(--max); margin: 0 auto; }
.hero { position: relative; display: grid; grid-template-columns: 47% 53%; min-height: calc(100svh - var(--header-height)); border-bottom: 1px solid var(--blue); }
.hero-copy { position: relative; z-index: 2; display: flex; flex-direction: column; justify-content: center; padding: clamp(64px,8vw,132px) clamp(32px,6vw,92px) 150px; }
.hero-index, .section-number, .step-number, figcaption, .hero-evidence span, .route b, .timeline time, .green-stamp span, .form-note {
  font-family: Consolas, "SFMono-Regular", monospace; font-variant-numeric: tabular-nums; letter-spacing: .08em;
}
.hero-index { position: absolute; top: 34px; left: 32px; writing-mode: vertical-rl; color: var(--blue); font-size: 12px; }
.hero h1 { max-width: 770px; font-size: clamp(48px,5.6vw,88px); line-height: .98; letter-spacing: -.04em; font-weight: 900; }
.hero-lead { max-width: 650px; margin-top: 36px; font-size: clamp(17px,1.25vw,20px); color: #383832; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 40px; }
.button { position: relative; isolation: isolate; display: inline-flex; align-items: center; justify-content: space-between; gap: 42px; min-height: 52px; padding: 13px 18px; border: 1px solid currentColor; font-weight: 750; overflow: hidden; }
.button::before { content: ""; position: absolute; z-index: -1; left: 0; bottom: 0; width: 0; height: 4px; background: #58a73c; transition: width .28s ease; }
.button:hover::before, .button:focus-visible::before { width: 100%; }
.button-primary { color: #fff; background: var(--blue); border-color: var(--blue); }
.text-link, .source-link { display: inline-flex; gap: 14px; align-items: center; width: fit-content; min-height: 44px; border-bottom: 1px solid currentColor; padding: 5px 0; font-weight: 700; }
.hero-media { position: relative; min-height: 640px; overflow: hidden; border-left: 1px solid var(--blue); }
.hero-media img { filter: saturate(.76) contrast(1.03); }
figcaption { position: absolute; z-index: 2; right: 0; bottom: 0; padding: 7px 12px; color: #fff; background: var(--blue); font-size: 11px; }
.hero-pipe { position: absolute; z-index: 3; top: 0; left: 47%; bottom: 85px; width: 18px; pointer-events: none; transform: translateX(-50%); }
.hero-pipe::before { content: ""; position: absolute; top: -1px; left: 1px; width: 16px; height: 42%; background: var(--blue); }
.hero-pipe::after { content: ""; position: absolute; top: 42%; left: -30px; width: 48px; height: 48px; border: 8px solid var(--blue); background: var(--paper); transform: rotate(45deg); }
.hero-pipe span { position: absolute; top: calc(42% + 40px); left: 1px; bottom: 0; width: 16px; background: var(--blue); }
.hero-evidence { position: absolute; z-index: 5; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: 150px 1fr auto; align-items: center; gap: 24px; min-height: 86px; padding: 16px 32px; color: #fff; background: var(--blue-deep); border-top: 1px solid var(--paper); }
.hero-evidence span { font-size: 12px; }
.hero-evidence strong { font-family: Georgia, "Songti SC", serif; font-size: clamp(21px,2vw,30px); font-weight: 500; }

.route { border-bottom: 1px solid var(--blue); background: var(--paper-light); }
.route ol { display: grid; grid-template-columns: repeat(6,1fr); margin: 0; padding: 0; list-style: none; }
.route li + li { border-left: 1px solid var(--line); }
.route a { display: flex; gap: 14px; align-items: center; min-height: 104px; padding: 20px 22px; }
.route a:hover, .route a:focus-visible { background: #fff; }
.route b { color: var(--blue); font-size: 28px; }
.route span { font-weight: 700; }

.chapter, .green-section, .record-section, .contact-section { position: relative; padding-left: 74px; border-bottom: 1px solid var(--blue); }
.chapter-rail { position: absolute; top: 0; left: 0; bottom: 0; width: 74px; display: flex; align-items: center; flex-direction: column; border-right: 1px solid var(--blue); color: var(--blue); }
.chapter-rail span { padding-top: 32px; font: 700 12px/1 Consolas, monospace; writing-mode: vertical-rl; letter-spacing: .12em; }
.chapter-rail i { position: relative; flex: 1; width: 3px; margin: 26px 0; background: rgba(5,58,140,.22); overflow: hidden; }
.chapter-rail i::after { content: ""; position: absolute; inset: 0; background: var(--blue); transform: scaleY(0); transform-origin: top; transition: transform .9s cubic-bezier(.22,1,.36,1); }
.is-visible > .chapter-rail i::after { transform: scaleY(1); }
.chapter-intro { display: grid; grid-template-columns: 3fr 5fr 4fr; gap: 40px; padding: 104px 5vw 92px; border-bottom: 1px solid var(--line); }
.section-number { color: var(--blue); font-size: 12px; font-weight: 800; }
h2 { font-size: clamp(42px,5vw,76px); line-height: 1.04; letter-spacing: -.04em; }
.chapter-intro > p:last-child { max-width: 520px; padding-top: 6px; color: #41413b; font-size: 17px; }
.process-step { display: grid; grid-template-columns: 5fr 7fr; min-height: 680px; border-bottom: 1px solid var(--line); }
.process-step.reverse { grid-template-columns: 7fr 5fr; }
.process-step.reverse .step-copy { order: 2; }
.process-step.reverse .step-media { order: 1; border-left: 0; border-right: 1px solid var(--line); }
.step-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(56px,7vw,112px); }
.step-number { color: var(--blue); font-size: 52px; font-weight: 800; line-height: 1; }
.step-copy h3 { margin-top: 26px; font-size: clamp(34px,4vw,58px); line-height: 1; letter-spacing: -.03em; }
.step-copy > p { max-width: 580px; margin-top: 28px; font-size: 18px; color: #383832; }
.step-copy dl { margin: 38px 0 0; border-top: 1px solid var(--line); }
.step-copy dl div { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.step-copy dt { color: var(--muted); }
.step-copy dd { margin: 0; font-weight: 700; }
.step-copy .source-link, .step-copy .text-link { margin-top: 34px; }
.step-media { position: relative; min-height: 560px; overflow: hidden; border-left: 1px solid var(--line); }
.step-media img { transition: transform 1s cubic-bezier(.22,1,.36,1); }
.step-media:hover img { transform: scale(1.02); }
.reveal-media::after { content: ""; position: absolute; z-index: 3; inset: 0; background: var(--blue); transform-origin: right; transition: transform .85s cubic-bezier(.77,0,.175,1); }
.reveal-media.is-revealed::after { transform: scaleX(0); }
.material-spread { display: grid; grid-template-columns: 7fr 5fr; min-height: 520px; border-bottom: 1px solid var(--line); }
.material-media { position: relative; min-height: 500px; overflow: hidden; }
.material-media img { object-position: left center; }
.material-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(50px,7vw,110px); color: #fff; background: var(--blue-deep); }
.material-copy .step-number { color: #b8d1ff; font-size: 14px; }
.material-copy blockquote { margin: 32px 0 24px; font: 500 clamp(32px,4vw,56px)/1.2 Georgia, "Songti SC", serif; }
.material-copy p { color: #e1e7f0; }

.green-section { display: grid; grid-template-columns: 5fr 7fr; min-height: 800px; color: #fff; background: var(--green); }
.green-section .chapter-rail { color: #fff; border-color: rgba(255,255,255,.35); }
.green-section .chapter-rail i { background: rgba(255,255,255,.2); }
.green-section .chapter-rail i::after { background: #fff; }
.green-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(60px,7vw,110px); }
.green-copy .section-number { color: #d7e9cd; }
.green-copy h2 { margin-top: 28px; font-size: clamp(44px,5vw,72px); }
.green-copy p { max-width: 580px; margin-top: 30px; color: #edf3e9; font-size: 18px; }
.button-light { align-self: flex-start; margin-top: 38px; color: var(--green); background: #fff; }
.green-media { position: relative; min-height: 660px; overflow: hidden; }
.green-media img { filter: saturate(.72); }
.green-stamp { position: absolute; z-index: 4; right: 42px; bottom: 40px; width: 250px; padding: 22px; color: var(--green); background: var(--paper-light); border: 4px double var(--green); transform: rotate(-2deg); }
.green-stamp span { font-size: 11px; }
.green-stamp strong { display: block; margin-top: 10px; font: 600 28px/1.25 Georgia, "Songti SC", serif; }

.record-section { display: grid; grid-template-columns: 5fr 7fr; }
.record-heading { padding: clamp(70px,7vw,112px); border-right: 1px solid var(--line); }
.record-heading h2 { margin-top: 28px; }
.record-media { position: relative; min-height: 520px; overflow: hidden; }
.timeline { grid-column: 1/-1; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--blue); }
.timeline li { display: grid; grid-template-columns: minmax(180px,2fr) 7fr; gap: 40px; padding: 38px clamp(32px,6vw,92px); border-bottom: 1px solid var(--line); }
.timeline li:last-child { border-bottom: 0; }
.timeline time { color: var(--blue); font-size: clamp(20px,2.4vw,34px); font-weight: 800; }
.timeline h3 { font-size: 26px; }
.timeline p { max-width: 720px; margin-top: 8px; color: var(--muted); }

.contact-section { display: grid; grid-template-columns: 5fr 7fr; color: #fff; background: var(--blue-deep); }
.contact-section .chapter-rail { color: #fff; border-color: rgba(255,255,255,.3); }
.contact-section .chapter-rail i { background: rgba(255,255,255,.2); }
.contact-section .chapter-rail i::after { background: #fff; }
.contact-media { position: relative; grid-column: 1/-1; height: 420px; overflow: hidden; }
.contact-media::before { content: ""; position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg,rgba(3,41,95,.78),transparent 70%); }
.contact-copy { padding: clamp(60px,7vw,110px); border-right: 1px solid rgba(255,255,255,.25); }
.contact-copy .section-number { color: #c6d6ed; }
.contact-copy h2 { margin-top: 28px; font-size: clamp(42px,5vw,70px); }
.contact-copy > p { max-width: 570px; margin-top: 28px; color: #dfe6f2; }
.contact-copy address { margin-top: 48px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.25); font-size: 18px; }
.contact-copy address span { display: block; margin-bottom: 8px; color: #b8c8e0; font-size: 13px; }
.inquiry-form { display: grid; grid-template-columns: 1fr 1fr; gap: 26px 24px; align-content: center; padding: clamp(60px,7vw,110px); }
.field { display: grid; gap: 8px; }
.field-wide { grid-column: 1/-1; }
.field label { font-size: 13px; color: #d9e2ef; }
.field input, .field textarea { width: 100%; color: #fff; background: rgba(255,255,255,.06); border: 0; border-bottom: 1px solid rgba(255,255,255,.6); border-radius: 0; padding: 13px 10px; }
.field textarea { resize: vertical; }
.field input:focus, .field textarea:focus { outline: 3px solid #fff; outline-offset: 3px; border-color: #fff; }
.form-submit { justify-self: start; border-color: #fff; }
.form-note { align-self: center; color: #c3cede; font-size: 11px; }
.form-status { grid-column: 1/-1; padding: 18px; color: #fff; border: 1px solid #fff; background: rgba(255,255,255,.08); }

.site-footer { display: grid; grid-template-columns: 2fr 2fr 1fr; gap: 30px; align-items: center; padding: 42px 32px 24px; color: #fff; background: var(--ink); }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13px; }
.site-footer nav a { display: inline-flex; align-items: center; min-height: 44px; }
.site-footer a:focus-visible, .mobile-menu a:focus-visible, .contact-section a:focus-visible { outline-color: #fff; }
.image-disclosure { text-align: right; color: #c8c5bd; font-size: 12px; }
.copyright { grid-column: 1/-1; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.18); color: #aaa79f; font-size: 11px; }

@media (max-width: 1100px) {
  .desktop-nav a { padding: 0 12px; }
  .desktop-nav a::after { left: 12px; right: 12px; }
  .hero { grid-template-columns: 52% 48%; }
  .hero-pipe { left: 52%; }
  .route span { font-size: 13px; }
  .chapter-intro { grid-template-columns: 1fr 2fr; }
  .chapter-intro > p:last-child { grid-column: 2; }
  .green-section, .record-section, .contact-section { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  :root { --header-height: 68px; }
  .site-header { padding: 0 20px; }
  .desktop-nav { display: none; }
  .menu-toggle { display: block; justify-self: end; }
  .menu-backdrop { position: fixed; z-index: 70; inset: 0; display: block; background: rgba(3,23,52,.58); }
  .mobile-menu { position: fixed; z-index: 80; top: 0; right: 0; bottom: 0; display: flex; flex-direction: column; width: min(86vw,420px); color: #fff; background: var(--blue-deep); transform: translateX(105%); transition: transform .3s ease; }
  .mobile-menu.is-open { transform: none; }
  .mobile-menu-head { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-height); padding: 0 22px; border-bottom: 1px solid rgba(255,255,255,.35); font: 12px Consolas, monospace; letter-spacing: .12em; }
  .menu-close { width: 48px; height: 48px; color: #fff; background: transparent; border: 1px solid rgba(255,255,255,.4); font-size: 30px; cursor: pointer; }
  .mobile-menu > a { display: grid; grid-template-columns: 90px 1fr; align-items: center; padding: 22px; border-bottom: 1px solid rgba(255,255,255,.22); font-size: 22px; }
  .mobile-menu > a span { color: #aabbd5; font: 12px Consolas, monospace; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy { min-height: 620px; padding: 90px 7vw 150px; }
  .hero-index { left: 18px; }
  .hero-media { min-height: 620px; border-top: 1px solid var(--blue); border-left: 0; }
  .hero-pipe { top: 520px; left: 50%; bottom: auto; height: 190px; }
  .hero-evidence { grid-template-columns: 110px 1fr auto; }
  .route { overflow-x: auto; scrollbar-width: thin; }
  .route ol { grid-template-columns: repeat(6, minmax(190px,1fr)); }
  .chapter, .green-section, .record-section, .contact-section { padding-left: 46px; }
  .chapter-rail { width: 46px; }
  .chapter-intro { grid-template-columns: 1fr; padding: 76px 7vw; }
  .chapter-intro > p:last-child { grid-column: auto; }
  .process-step, .process-step.reverse, .material-spread, .green-section, .record-section, .contact-section { grid-template-columns: 1fr; }
  .process-step.reverse .step-copy, .process-step.reverse .step-media { order: initial; }
  .process-step.reverse .step-media, .step-media { border: 0; border-top: 1px solid var(--line); }
  .step-media { min-height: 500px; }
  .material-media { min-height: 480px; }
  .green-copy { min-height: 600px; }
  .green-media { min-height: 560px; }
  .record-heading { border-right: 0; border-bottom: 1px solid var(--line); }
  .timeline { grid-column: auto; }
  .contact-media { grid-column: auto; }
  .contact-copy { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.25); }
  .site-footer { grid-template-columns: 1fr 1fr; }
  .image-disclosure { text-align: left; }
}

@media (max-width: 520px) {
  body { background-size: 48px 48px, 48px 48px, 100% 100%; }
  .site-header { padding: 0 14px; }
  .brand { gap: 9px; font-size: 15px; }
  .brand-mark { width: 32px; height: 32px; }
  .hero-copy { min-height: 560px; padding: 72px 24px 142px 34px; }
  .hero h1 { font-size: clamp(42px,13vw,62px); }
  .hero-lead { font-size: 16px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .hero-media { min-height: 440px; }
  .hero-media img { object-position: 65% center; }
  .hero-pipe { top: 505px; }
  .hero-evidence { grid-template-columns: 1fr auto; gap: 8px 14px; padding: 15px 18px; }
  .hero-evidence strong { grid-column: 1; font-size: 20px; }
  .hero-evidence span:last-child { grid-column: 2; grid-row: 1/3; }
  .chapter, .green-section, .record-section, .contact-section { padding-left: 30px; }
  .chapter-rail { width: 30px; }
  .chapter-rail span { padding-top: 20px; font-size: 10px; }
  .chapter-intro, .step-copy, .green-copy, .record-heading, .contact-copy, .inquiry-form { padding: 58px 24px; }
  h2 { font-size: 42px; }
  .step-copy h3 { font-size: 38px; }
  .step-media { min-height: 340px; }
  .step-media img { object-position: center; }
  .material-media { min-height: 340px; }
  .material-copy { padding: 52px 24px; }
  .material-copy blockquote { font-size: 36px; }
  .green-copy { min-height: 560px; }
  .green-media { min-height: 420px; }
  .green-stamp { right: 14px; bottom: 16px; width: 205px; padding: 16px; }
  .green-stamp strong { font-size: 23px; }
  .record-media { min-height: 340px; }
  .timeline li { grid-template-columns: 1fr; gap: 12px; padding: 28px 24px; }
  .contact-media { height: 300px; }
  .inquiry-form { grid-template-columns: 1fr; }
  .field-wide, .form-status { grid-column: auto; }
  .form-note { max-width: 250px; }
  .site-footer { grid-template-columns: 1fr; padding: 36px 24px 22px; }
  .site-footer nav { display: grid; grid-template-columns: 1fr 1fr; }
  .copyright { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal-media::after { display: none; }
  .chapter-rail i::after { transform: scaleY(1); }
}