:root {
  --night: #101a22;
  --ink-deep: #0a1117;
  --blueprint: #2e5b73;
  --copper: #5f817b;
  --sand: #eeeae1;
  --concrete: #c9cdd0;
  --paper: #f7f6f2;
  --ink: #172027;
  --line: rgba(23, 32, 39, 0.18);
  --page: min(1280px, calc(100vw - max(40px, 8vw)));
  --header-height: 80px;
  --sans: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --latin: "Inter", "DIN Alternate", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
h1, h2, h3, p, dl, dd { margin-top: 0; }
h1, h2, h3 { text-wrap: balance; }
section { scroll-margin-top: var(--header-height); }

.page-shell { width: var(--page); margin-inline: auto; }
.skip-link {
  position: fixed; z-index: 1000; top: 12px; left: 12px;
  padding: 10px 14px; color: var(--ink-deep); background: #fff;
  transform: translateY(-160%); transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 2px solid currentColor; outline-offset: 4px; }

.site-header {
  position: fixed; inset: 0 0 auto; z-index: 100;
  height: var(--header-height); padding-inline: max(24px, 4vw);
  display: flex; align-items: center; justify-content: space-between;
  color: #fff; transition: background .25s ease, border-color .25s ease;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled, .site-header.menu-active {
  background: rgba(10, 17, 23, .94); border-bottom-color: rgba(255, 255, 255, .14);
  backdrop-filter: blur(12px);
}
.brand { max-width: 44vw; font-size: 14px; font-weight: 600; letter-spacing: .04em; text-decoration: none; }
.desktop-nav { display: flex; gap: clamp(22px, 2.5vw, 42px); align-items: center; }
.desktop-nav a {
  position: relative; padding: 12px 0; font-size: 13px; letter-spacing: .06em; text-decoration: none;
}
.desktop-nav a span { margin-right: 7px; color: var(--concrete); font-family: var(--latin); font-size: 10px; }
.desktop-nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 7px; height: 1px;
  background: #78a5bb; transition: right .2s ease;
}
.desktop-nav a:hover::after, .desktop-nav a.active::after { right: 0; }
.desktop-nav a.active span { color: #fff; }
.menu-toggle {
  display: none; min-width: 56px; min-height: 44px; padding: 0; border: 0; color: #fff;
  background: transparent; cursor: pointer; align-items: center; gap: 12px;
}
.menu-label { font-size: 13px; letter-spacing: .1em; }
.menu-icon { width: 22px; height: 16px; position: relative; display: block; }
.menu-icon i { position: absolute; left: 0; width: 100%; height: 1px; background: currentColor; transition: transform .25s ease, top .25s ease; }
.menu-icon i:first-child { top: 4px; }
.menu-icon i:last-child { top: 12px; }
.menu-toggle[aria-expanded="true"] .menu-icon i:first-child { top: 8px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-icon i:last-child { top: 8px; transform: rotate(-45deg); }

.mobile-directory {
  position: fixed; z-index: 90; inset: 0; padding: calc(var(--header-height) + 48px) max(24px, 7vw) 48px;
  color: #fff; background: var(--ink-deep); visibility: hidden; opacity: 0; transform: translateY(-20px);
  transition: opacity .25s ease, transform .3s ease, visibility .3s;
}
.mobile-directory.open { visibility: visible; opacity: 1; transform: translateY(0); }
.mobile-directory nav { border-top: 1px solid rgba(255,255,255,.2); }
.mobile-directory a {
  display: flex; align-items: baseline; gap: 24px; min-height: 67px; padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,.2); font-size: clamp(24px, 6vw, 38px); text-decoration: none;
}
.mobile-directory a span { color: #86a9b9; font: 13px var(--latin); }
.mobile-directory p { margin-top: 38px; max-width: 25em; color: var(--concrete); font-size: 14px; }

.hero { position: relative; min-height: max(680px, 100svh); overflow: hidden; color: #fff; background: var(--ink-deep); }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; animation: image-in .6s ease both; }
.hero-shade {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(4,9,13,.9) 0%, rgba(4,9,13,.54) 44%, rgba(4,9,13,.16) 75%), linear-gradient(0deg, rgba(4,9,13,.86) 0%, transparent 56%, rgba(4,9,13,.48) 100%);
}
.blueprint-grid {
  position: absolute; inset: 0; opacity: .26;
  background-image: linear-gradient(rgba(255,255,255,.15) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.12) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(to bottom, transparent 5%, #000 25%, #000 90%);
}
.hero-content { position: relative; z-index: 2; min-height: max(680px, 100svh); display: flex; align-items: flex-end; padding: 160px 0 9vh; }
.hero-copy { max-width: 1080px; animation: copy-in .4s .08s ease both; }
.eyebrow, .section-kicker, .field-label { font-size: 12px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow { display: flex; gap: 18px; margin-bottom: 28px; color: rgba(255,255,255,.78); }
.eyebrow span { font-family: var(--latin); color: #fff; }
.hero h1 { margin-bottom: 30px; max-width: 12em; font-size: clamp(48px, 7vw, 108px); line-height: .98; letter-spacing: -.055em; }
.hero-intro { max-width: 36em; margin-bottom: 34px; color: rgba(255,255,255,.82); font-size: clamp(16px, 1.4vw, 19px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 11px 20px;
  border: 1px solid var(--sand); border-radius: 2px; font-size: 14px; font-weight: 600; text-decoration: none;
  transition: background .2s ease, transform .2s ease, filter .2s ease;
}
.button-primary { color: var(--ink); background: var(--sand); }
.button-primary:hover { background: #fff; transform: translateY(-1px); }
.button-secondary { color: #fff; background: transparent; }
.button-secondary:hover { background: rgba(255,255,255,.12); }
.button:active { transform: none; filter: brightness(.94); }
.scroll-cue {
  position: absolute; right: 0; bottom: 9vh; display: flex; align-items: center; gap: 16px;
  color: rgba(255,255,255,.75); font: 11px var(--latin); letter-spacing: .14em; text-decoration: none;
}
.scroll-cue i { display: block; width: 54px; height: 1px; background: #fff; position: relative; }
.scroll-cue i::after { content: ""; position: absolute; right: 0; top: -3px; width: 7px; height: 7px; border-right: 1px solid #fff; border-bottom: 1px solid #fff; transform: rotate(-45deg); }

.chapter { padding: clamp(104px, 10vw, 152px) 0; }
.chapter-layout { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
.chapter-heading { grid-column: span 4; }
.chapter-number { margin-bottom: 36px; color: var(--blueprint); font: 500 clamp(54px, 6vw, 88px)/1 var(--latin); letter-spacing: -.05em; }
.section-kicker { margin-bottom: 20px; color: var(--blueprint); }
.chapter h2 { margin-bottom: 0; font-size: clamp(36px, 4.1vw, 56px); line-height: 1.15; letter-spacing: -.035em; }

.identity { padding-bottom: clamp(88px, 8vw, 128px); }
.identity-grid { display: grid; grid-template-columns: 2fr 5fr 5fr; gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.chapter-mark { padding-top: 28px; color: var(--blueprint); font: 500 clamp(72px, 8vw, 126px)/.9 var(--latin); letter-spacing: -.06em; }
.identity-intro, .identity-list { padding: 34px clamp(24px, 3vw, 48px) 40px; border-left: 1px solid var(--line); }
.identity-intro h2 { font-size: clamp(30px, 3vw, 46px); }
.identity-list { margin: 0; }
.identity-list div { padding: 0 0 19px; margin-bottom: 18px; border-bottom: 1px solid var(--line); }
.identity-list div:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: 0; }
.identity-list dt, .scenario-copy dt { margin-bottom: 4px; color: #5d6870; font-size: 12px; font-weight: 600; letter-spacing: .12em; }
.identity-list dd { margin: 0; font-size: 17px; font-weight: 600; }
.identity-note { display: flex; gap: 14px; align-items: baseline; padding-top: 22px; color: #59636a; }
.identity-note p { margin: 0; }
.identity-note span { color: var(--blueprint); }

.platform { color: var(--ink); background: var(--sand); }
.platform-status { display: flex; justify-content: space-between; padding-bottom: 18px; border-bottom: 1px solid rgba(23,32,39,.36); font: 600 12px var(--sans); letter-spacing: .12em; }
.platform-status span:first-child { display: flex; align-items: center; gap: 9px; }
.platform-status i { width: 8px; height: 8px; background: var(--copper); display: inline-block; }
.platform-layout { display: grid; grid-template-columns: 2fr 10fr; gap: 24px; padding-top: 40px; }
.platform-rail { display: flex; flex-direction: column; justify-content: space-between; min-height: 420px; padding-right: 24px; border-right: 1px solid rgba(23,32,39,.28); }
.platform-rail strong { color: var(--blueprint); font: 500 clamp(76px, 8vw, 122px)/.85 var(--latin); letter-spacing: -.07em; }
.platform-rail span { color: #5b666d; font: 11px/1.6 var(--latin); letter-spacing: .12em; }
.platform-record { padding-left: clamp(12px, 4vw, 64px); }
.field-label { margin-bottom: 12px; color: #5a686d; }
.platform-record h2 { max-width: 13em; margin-bottom: clamp(50px, 6vw, 82px); font-size: clamp(44px, 6vw, 78px); }
.platform-field { display: grid; grid-template-columns: 180px 1fr; gap: 24px; padding: 27px 0; border-top: 1px solid rgba(23,32,39,.28); }
.platform-field p { margin-bottom: 0; }
.platform-field .field-label { padding-top: 5px; }
.operator { font-size: clamp(20px, 2vw, 28px); font-weight: 600; }
.platform-description > p:last-child { max-width: 32em; font-size: clamp(23px, 2.8vw, 38px); line-height: 1.55; letter-spacing: -.02em; }

.scenario-list { grid-column: 5 / -1; position: relative; }
.scenario-list::before { content: ""; position: absolute; left: 45px; top: 10px; bottom: 60px; width: 1px; background: var(--line); }
.scenario-item { position: relative; display: grid; grid-template-columns: 92px 1fr; gap: 28px; padding-bottom: 92px; }
.scenario-item:last-child { padding-bottom: 0; }
.scenario-offset .scenario-copy { margin-left: 10%; }
.scenario-index { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; gap: 12px; color: var(--blueprint); font: 600 12px var(--latin); }
.scenario-index span { padding: 2px 6px; background: var(--paper); }
.scenario-index i { width: 9px; height: 9px; background: var(--blueprint); border: 3px solid var(--paper); outline: 1px solid var(--blueprint); }
.scenario-copy { padding: 0 0 30px; border-bottom: 1px solid var(--line); }
.scenario-copy h3 { margin-bottom: 26px; font-size: clamp(28px, 3vw, 42px); line-height: 1.2; }
.scenario-copy dl { margin: 0; }
.scenario-copy dl div { display: grid; grid-template-columns: 116px minmax(0, 1fr); gap: 20px; padding: 13px 0; }
.scenario-copy dd { margin: 0; max-width: 40em; }
.scenario-copy dl div:last-child dd { color: #58646b; }

.collaboration { color: #fff; background: var(--blueprint); }
.collaboration-heading { display: grid; grid-template-columns: 4fr 8fr; gap: 24px; padding-bottom: 80px; border-bottom: 1px solid rgba(255,255,255,.28); }
.collaboration .chapter-number, .collaboration .section-kicker { color: #d7e2e5; }
.collaboration-heading > div:last-child { padding-left: 8.333%; }
.collaboration-heading h2 { margin-bottom: 24px; }
.collaboration-heading p:last-child { max-width: 34em; color: rgba(255,255,255,.76); }
.protocol-list { position: relative; list-style: none; margin: 0; padding: 76px 0 0; }
.protocol-list::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: rgba(255,255,255,.42); }
.protocol-list li { position: relative; width: 50%; min-height: 190px; display: grid; grid-template-columns: 60px 1fr; gap: 22px; padding: 24px 7% 48px 0; }
.protocol-list li:nth-child(even) { margin-left: 50%; padding: 24px 0 48px 7%; }
.protocol-list li::after { content: ""; position: absolute; top: 30px; right: -5px; width: 9px; height: 9px; background: #fff; }
.protocol-list li:nth-child(even)::after { left: -4px; right: auto; }
.protocol-no { font: 500 12px var(--latin); letter-spacing: .1em; color: rgba(255,255,255,.72); }
.protocol-list h3 { margin-bottom: 14px; font-size: clamp(27px, 3vw, 40px); }
.protocol-list p { margin: 0; color: rgba(255,255,255,.76); }

.preparation-content { grid-column: 5 / -1; display: grid; grid-template-columns: 2fr 1fr; gap: 32px; }
.table-wrap { overflow: hidden; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { padding: 22px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
thead th { padding-top: 0; color: #647078; font-size: 11px; letter-spacing: .1em; }
tbody th { width: 20%; font-size: 15px; }
tbody tr { transition: background .2s ease; }
tbody tr:hover { background: rgba(46,91,115,.04); }
.self-check { padding: 28px; color: #fff; background: var(--night); }
.self-check .field-label { color: var(--concrete); }
.self-check ol { list-style: none; margin: 38px 0 0; padding: 0; }
.self-check li { display: flex; gap: 18px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,.18); }
.self-check li span { color: #91aab5; font: 12px var(--latin); }

.boundaries { color: #fff; background: var(--ink-deep); }
.boundary-heading { display: grid; grid-template-columns: 4fr 8fr; gap: 24px; padding-bottom: 70px; }
.boundaries .chapter-number, .boundaries .section-kicker { color: #7f9eac; }
.boundary-heading h2 { padding-left: 8.333%; }
.boundary-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid rgba(255,255,255,.24); }
.boundary-list li { display: grid; grid-template-columns: 1fr 3fr 5fr; gap: 24px; align-items: baseline; padding: 34px 0; border-bottom: 1px solid rgba(255,255,255,.24); }
.boundary-list span { color: #87a6b4; font: clamp(30px, 4vw, 56px)/1 var(--latin); }
.boundary-list h3 { margin: 0; font-size: clamp(20px, 2vw, 28px); }
.boundary-list p { max-width: 38em; margin: 0; color: rgba(255,255,255,.7); }
.boundary-closing { max-width: 16em; margin: 90px 0 0 auto; font-size: clamp(27px, 3vw, 42px); line-height: 1.45; }

.site-footer { color: rgba(255,255,255,.7); background: var(--night); border-top: 1px solid rgba(255,255,255,.16); }
.site-footer .page-shell { min-height: 104px; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; align-items: center; font-size: 13px; }
.site-footer p { margin: 0; }
.site-footer a { justify-self: end; text-underline-offset: 4px; text-decoration-thickness: 1px; }
.site-footer a:hover { color: #fff; text-decoration-thickness: 2px; }

[data-section] .chapter-number, [data-section] .chapter-mark, [data-section] .platform-rail strong { transition: opacity .3s ease, transform .3s ease; }
[data-section].awaiting .chapter-number, [data-section].awaiting .chapter-mark, [data-section].awaiting .platform-rail strong { opacity: 0; transform: translateY(12px); }

@keyframes image-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes copy-in { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 1023px) {
  :root { --page: calc(100vw - 48px); --header-height: 72px; }
  .desktop-nav { display: none; }
  .menu-toggle { display: flex; }
  .hero-copy { max-width: 78%; }
  .scroll-cue { right: 0; }
  .identity-grid { grid-template-columns: 1fr 3fr; }
  .identity-intro { border-left: 1px solid var(--line); }
  .identity-list { grid-column: 2; border-top: 1px solid var(--line); }
  .chapter-layout { grid-template-columns: repeat(8, 1fr); }
  .chapter-heading { grid-column: span 2; }
  .scenario-list, .preparation-content { grid-column: 3 / -1; }
  .platform-layout { grid-template-columns: 1fr 5fr; }
  .platform-rail { min-height: 360px; }
  .platform-field { grid-template-columns: 140px 1fr; }
  .protocol-list::before { left: 18%; }
  .protocol-list li, .protocol-list li:nth-child(even) { width: 82%; margin-left: 18%; padding: 24px 0 48px 8%; }
  .protocol-list li::after, .protocol-list li:nth-child(even)::after { left: -4px; right: auto; }
  .collaboration-heading, .boundary-heading { grid-template-columns: 2fr 6fr; }
  .preparation-content { grid-template-columns: 1fr; }
  .self-check { display: grid; grid-template-columns: 1fr 2fr; gap: 28px; }
  .self-check ol { margin-top: 0; }
}

@media (max-width: 767px) {
  :root { --page: calc(100vw - 40px); }
  body { font-size: 16px; }
  .site-header { padding-inline: 20px; }
  .brand { max-width: calc(100vw - 120px); font-size: 12px; line-height: 1.35; }
  .hero { min-height: max(620px, 100svh); }
  .hero-image { object-position: 58% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(4,9,13,.85), rgba(4,9,13,.2)), linear-gradient(0deg, rgba(4,9,13,.94) 0%, rgba(4,9,13,.28) 70%, rgba(4,9,13,.52)); }
  .blueprint-grid { background-size: 64px 64px; }
  .hero-content { min-height: max(620px, 100svh); padding: 132px 0 64px; }
  .hero-copy { max-width: 100%; }
  .hero h1 { font-size: clamp(42px, 13vw, 52px); line-height: 1.02; }
  .hero-intro { margin-bottom: 26px; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .scroll-cue { display: none; }
  .chapter { padding: 80px 0; }
  .chapter h2 { font-size: clamp(30px, 9vw, 36px); }
  .identity-grid { display: block; }
  .chapter-mark { padding: 25px 0; }
  .identity-intro, .identity-list { padding: 28px 0; border-left: 0; border-top: 1px solid var(--line); }
  .identity-list { border-bottom: 0; }
  .identity-note { padding-top: 18px; }
  .platform-status { gap: 18px; }
  .platform-layout { display: block; padding-top: 28px; }
  .platform-rail { min-height: auto; flex-direction: row; align-items: flex-end; padding: 0 0 32px; border-right: 0; border-bottom: 1px solid rgba(23,32,39,.28); }
  .platform-rail strong { font-size: 72px; }
  .platform-record { padding: 36px 0 0; }
  .platform-record h2 { margin-bottom: 48px; font-size: clamp(40px, 12vw, 54px); }
  .platform-field { display: block; padding: 24px 0; }
  .platform-field .field-label { padding-top: 0; }
  .platform-description > p:last-child { font-size: 23px; }
  .chapter-layout { display: block; }
  .chapter-heading { margin-bottom: 58px; }
  .chapter-number { margin-bottom: 24px; font-size: 64px; }
  .scenario-list::before { left: 5px; }
  .scenario-item { grid-template-columns: 28px 1fr; gap: 18px; padding-bottom: 68px; }
  .scenario-offset .scenario-copy { margin-left: 0; }
  .scenario-index { align-items: flex-start; }
  .scenario-index span { writing-mode: vertical-rl; padding: 4px 0; }
  .scenario-index i { margin-left: 1px; }
  .scenario-copy h3 { margin-bottom: 18px; font-size: 28px; }
  .scenario-copy dl div { display: block; padding: 12px 0; }
  .scenario-copy dt { margin-bottom: 5px; }
  .collaboration-heading, .boundary-heading { display: block; padding-bottom: 52px; }
  .collaboration-heading > div:last-child, .boundary-heading h2 { padding-left: 0; }
  .collaboration-heading > div:first-child, .boundary-heading > div { margin-bottom: 36px; }
  .protocol-list { padding-top: 52px; }
  .protocol-list::before { left: 5px; }
  .protocol-list li, .protocol-list li:nth-child(even) { width: 100%; min-height: 0; margin: 0; padding: 14px 0 52px 30px; grid-template-columns: 38px 1fr; gap: 12px; }
  .protocol-list li::after, .protocol-list li:nth-child(even)::after { left: 1px; top: 20px; }
  .protocol-list h3 { font-size: 28px; }
  .preparation-content { display: block; }
  .table-wrap { overflow: visible; }
  table, thead, tbody, tr, th, td { display: block; }
  thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  tbody tr { padding: 22px 0; border-top: 1px solid var(--line); }
  tbody tr:last-child { border-bottom: 1px solid var(--line); }
  th, td { padding: 0; border: 0; }
  tbody th { width: auto; margin-bottom: 12px; font-size: 20px; }
  tbody td { margin-top: 8px; }
  tbody td::before { content: "说明 / "; color: #68747a; font-size: 11px; font-weight: 600; letter-spacing: .08em; }
  tbody td:last-child::before { content: "提交原则 / "; }
  .self-check { display: block; margin-top: 36px; padding: 24px; }
  .self-check ol { margin-top: 28px; }
  .boundary-list li { display: grid; grid-template-columns: 56px 1fr; gap: 12px 16px; padding: 28px 0; }
  .boundary-list span { grid-row: span 2; font-size: 32px; }
  .boundary-list h3 { font-size: 21px; }
  .boundary-list p { grid-column: 2; }
  .boundary-closing { margin-top: 60px; font-size: 28px; }
  .site-footer .page-shell { display: flex; min-height: 0; padding: 34px 0; flex-direction: column; align-items: flex-start; gap: 12px; }
  .site-footer a { justify-self: 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; }
  [data-section].awaiting .chapter-number, [data-section].awaiting .chapter-mark, [data-section].awaiting .platform-rail strong { opacity: 1; transform: none; }
}