:root {
  --ink: #071c24;
  --ink-2: #102f39;
  --paper: #f4f0e8;
  --paper-2: #e9e3d8;
  --white: #fffdf8;
  --orange: #ff6b32;
  --orange-dark: #c9481a;
  --mint: #b6d1c6;
  --line: rgba(7, 28, 36, .17);
  --line-light: rgba(255, 255, 255, .16);
  --shadow: 0 24px 70px rgba(7, 28, 36, .14);
  --radius: 18px;
  --max: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }

.skip-link {
  position: fixed; left: 12px; top: -80px; z-index: 100;
  padding: 10px 16px; background: var(--white); color: var(--ink); border-radius: 8px;
}
.skip-link:focus { top: 12px; }
.wrap { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 14px; color: var(--orange-dark); font-size: 13px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 24px; height: 3px; background: currentColor; }
.on-dark { color: #ff966e; }
.muted { color: #53666b; }
.concept-label { position: absolute; right: 14px; bottom: 12px; padding: 6px 10px; border: 1px solid rgba(255,255,255,.35); border-radius: 999px; color: white; background: rgba(7,28,36,.76); font-size: 12px; letter-spacing: .08em; backdrop-filter: blur(8px); }

.site-header { position: sticky; top: 0; z-index: 40; color: var(--white); background: rgba(7,28,36,.94); border-bottom: 1px solid var(--line-light); backdrop-filter: blur(16px); }
.nav-shell { min-height: 76px; display: flex; align-items: center; gap: 28px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 270px; font-weight: 800; line-height: 1.25; }
.brand-mark { position: relative; flex: 0 0 38px; width: 38px; height: 38px; border: 1px solid rgba(255,255,255,.4); border-radius: 50%; }
.brand-mark::before, .brand-mark::after { content: ""; position: absolute; left: 8px; right: 8px; height: 5px; transform: skewX(-22deg); }
.brand-mark::before { top: 10px; background: var(--orange); }
.brand-mark::after { bottom: 10px; background: var(--mint); }
.brand small { display: block; font-weight: 500; font-size: 11px; letter-spacing: .12em; color: #b7c9cb; }
.site-nav { display: flex; align-items: center; gap: 26px; margin-left: auto; font-size: 15px; }
.site-nav a { color: #dce7e6; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: white; }
.nav-cta { padding: 10px 17px; border-radius: 999px; background: var(--orange); color: var(--ink) !important; font-weight: 800; }
.menu-button { display: none; margin-left: auto; padding: 9px 12px; border: 1px solid var(--line-light); border-radius: 8px; color: white; background: transparent; }

.hero { color: var(--white); background: var(--ink); overflow: hidden; }
.hero-grid { min-height: 720px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(420px, 1fr); align-items: stretch; }
.hero-copy { position: relative; z-index: 2; display: flex; flex-direction: column; justify-content: center; padding: 86px 56px 82px max(24px, calc((100vw - var(--max))/2)); }
.hero h1 { max-width: 720px; margin: 0 0 24px; font-size: clamp(50px, 4.3vw, 62px); line-height: 1.05; letter-spacing: -.055em; }
.hero h1 span { color: var(--orange); }
.hero h1 .white { color: var(--white); }
.nowrap { white-space: nowrap; }
.mobile-only { display: none; }
.desktop-only { display: inline; }
.hero-lede { max-width: 620px; margin: 0 0 30px; color: #cbd9d8; font-size: 18px; line-height: 1.8; }
.hero-actions, .button-row { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 11px 20px; border: 1px solid transparent; border-radius: 999px; font-weight: 800; cursor: pointer; }
.button.primary { color: var(--ink); background: var(--orange); }
.button.secondary { color: var(--white); border-color: rgba(255,255,255,.35); background: transparent; }
.button.dark { color: var(--white); background: var(--ink); }
.button.light { color: var(--ink); background: var(--white); }
.button:hover { transform: translateY(-1px); }
.hero-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; max-width: 610px; margin-top: 54px; background: var(--line-light); }
.hero-notes div { padding: 13px 16px; background: var(--ink); }
.hero-notes strong { display: block; color: white; font-size: 14px; }
.hero-notes span { color: #91a8aa; font-size: 12px; }
.hero-visual { position: relative; min-width: 0; overflow: hidden; border-left: 1px solid var(--line-light); }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,28,36,.42), transparent 40%), linear-gradient(0deg, rgba(7,28,36,.55), transparent 36%); pointer-events: none; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: 58% center; }
.route-ticker { position: absolute; z-index: 2; left: 24px; bottom: 28px; display: flex; gap: 8px; }
.route-ticker span { padding: 7px 10px; border: 1px solid rgba(255,255,255,.35); border-radius: 999px; color: white; background: rgba(7,28,36,.74); font-size: 12px; }
.hero-keywords { position: absolute; z-index: 2; top: 54px; left: 34px; display: flex; flex-direction: column; gap: 15px; pointer-events: none; }
.hero-keywords .kw-eyebrow { color: #fddfc7; font-size: 16px; font-weight: 700; letter-spacing: .12em; text-shadow: 0 1px 8px rgba(7,28,36,.55); }
.hero-keywords .kw-row { display: flex; gap: 12px; padding-left: 4px; }
.hero-keywords .kw-line { writing-mode: vertical-rl; text-orientation: upright; color: #eff6f4; font-size: 28px; font-weight: 800; letter-spacing: .18em; line-height: 1; text-shadow: 0 2px 14px rgba(7,28,36,.65); }

.section { padding: 112px 0; }
.section.tight { padding: 72px 0; }
.section.dark { color: var(--white); background: var(--ink); }
.section.white { background: var(--white); }
.section-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: end; margin-bottom: 54px; }
.section-head h2, .page-intro h1 { margin: 0; font-size: clamp(40px, 5vw, 64px); line-height: 1.13; letter-spacing: -.045em; }
.section-head p { max-width: 640px; margin: 0; color: #596b70; }
.dark .section-head p { color: #b9c9c9; }

.service-rail { border-top: 1px solid var(--line); }
.service-row { display: grid; grid-template-columns: 110px minmax(0, .8fr) minmax(260px, 1fr) 52px; gap: 32px; align-items: center; padding: 38px 0; border-bottom: 1px solid var(--line); }
.service-row .num { color: var(--orange-dark); font-size: 14px; font-weight: 800; letter-spacing: .12em; }
.service-row h3 { margin: 0; font-size: 30px; line-height: 1.25; }
.service-row p { margin: 0; color: #596b70; }
.service-row .arrow { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 50%; transition: .2s; }
.service-row:hover .arrow { color: white; background: var(--orange-dark); transform: translateX(4px); }

.node-map { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; }
.node-map h2 { position: sticky; top: 118px; margin: 0; font-size: clamp(42px, 5vw, 62px); line-height: 1.12; letter-spacing: -.04em; }
.node-list { counter-reset: nodes; }
.node { position: relative; display: grid; grid-template-columns: 64px 1fr; gap: 24px; padding: 0 0 44px; }
.node::before { counter-increment: nodes; content: "0" counter(nodes); display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; color: var(--ink); background: var(--orange); font-size: 12px; font-weight: 800; }
.node:not(:last-child)::after { content: ""; position: absolute; left: 23px; top: 55px; bottom: 4px; width: 1px; background: var(--line-light); }
.node h3 { margin: 0 0 8px; font-size: 24px; }
.node p { margin: 0; color: #b9c9c9; }

.split-feature { display: grid; grid-template-columns: 1.08fr .92fr; min-height: 600px; }
.feature-media { position: relative; overflow: hidden; background: var(--ink-2); }
.feature-media img { width: 100%; height: 100%; object-fit: cover; }
.feature-copy { display: flex; flex-direction: column; justify-content: center; padding: 70px max(30px, calc((100vw - var(--max))/2)); padding-left: 70px; background: var(--orange); }
.feature-copy h2 { max-width: 560px; margin: 0 0 24px; font-size: clamp(44px, 5vw, 68px); line-height: 1.05; letter-spacing: -.05em; }
.feature-copy p { max-width: 530px; margin: 0 0 28px; }

.editorial-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 24px; }
.editorial-card { min-height: 390px; display: flex; flex-direction: column; justify-content: end; padding: 38px; border: 1px solid var(--line); background: var(--white); }
.editorial-card.accent { color: white; background: var(--ink-2); }
.editorial-card small { color: var(--orange-dark); font-weight: 800; letter-spacing: .12em; }
.editorial-card.accent small { color: #ff966e; }
.editorial-card h3 { margin: 14px 0 12px; font-size: clamp(30px, 3vw, 44px); line-height: 1.2; }
.editorial-card p { margin: 0; color: #637276; }
.editorial-card.accent p { color: #b9c9c9; }

.faq-stack { max-width: 860px; margin-left: auto; }
.faq-stack details { border-top: 1px solid var(--line); }
.faq-stack details:last-child { border-bottom: 1px solid var(--line); }
.faq-stack summary { display: flex; justify-content: space-between; gap: 20px; padding: 25px 0; cursor: pointer; font-size: 20px; font-weight: 800; list-style: none; }
.faq-stack summary::after { content: "+"; color: var(--orange-dark); }
.faq-stack details[open] summary::after { content: "−"; }
.faq-stack details p { max-width: 720px; margin: -8px 0 28px; color: #596b70; }

.final-cta { padding: 92px 0; color: white; background: var(--ink-2); }
.final-cta .wrap { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; }
.final-cta h2 { max-width: 780px; margin: 0; font-size: clamp(42px, 5vw, 66px); line-height: 1.08; letter-spacing: -.045em; }

.site-footer { padding: 68px 0 26px; color: #b9c9c9; background: #041217; }
.footer-grid { display: grid; grid-template-columns: 1.3fr repeat(3, .7fr); gap: 45px; }
.footer-brand { max-width: 430px; }
.footer-brand h2 { margin: 0 0 14px; color: white; font-size: 24px; }
.footer-brand p { margin: 0; color: #8fa4a5; }
.footer-col h3 { margin: 0 0 14px; color: white; font-size: 14px; letter-spacing: .1em; }
.footer-col a { display: block; margin: 8px 0; font-size: 14px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 40px; margin-top: 44px; border-top: 1px solid var(--line-light); font-size: 12px; }

.page-intro { padding: 96px 0 76px; color: var(--white); background: var(--ink); }
.page-intro .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; align-items: end; }
.page-intro p { max-width: 590px; margin: 0; color: #bed0cf; font-size: 18px; }
.crumbs { margin-bottom: 26px; color: #91a8aa; font-size: 13px; }
.crumbs a { color: #d9e4e2; }
.detail-hero { padding: 76px 0; border-bottom: 1px solid var(--line); }
.detail-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 80px; align-items: start; }
.detail-aside { position: sticky; top: 112px; }
.detail-aside h2 { margin: 0 0 18px; font-size: 28px; }
.detail-aside p { margin: 0; color: #596b70; }
.content-block { padding: 0 0 70px; }
.content-block h2 { margin: 0 0 22px; font-size: clamp(36px, 4vw, 52px); line-height: 1.18; letter-spacing: -.035em; }
.content-block h3 { margin: 30px 0 12px; font-size: 23px; }
.content-block p { max-width: 760px; }
.boundary-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.boundary-list article { padding: 28px; background: var(--white); }
.boundary-list strong { display: block; margin-bottom: 8px; font-size: 19px; }
.boundary-list p { margin: 0; color: #596b70; }
.callout { padding: 28px 30px; border-left: 5px solid var(--orange); background: var(--white); }
.callout strong { display: block; margin-bottom: 6px; }
.callout p { margin: 0; }

.article-shell { max-width: 830px; margin: 0 auto; }
.page-intro .article-shell { display: block; max-width: var(--max); }
.page-intro .article-shell h1 { max-width: 900px; font-size: clamp(46px, 4.2vw, 58px); }
.page-intro .article-shell > p { max-width: 680px; margin-top: 28px; }
.article-body { padding: 84px 0 112px; }
.article-body .article-shell { max-width: 660px; }
.article-body h2 { margin: 54px 0 14px; font-size: 32px; line-height: 1.3; }
.article-body p, .article-body li { color: #334d55; font-size: 18px; }
.article-body ul, .article-body ol { padding-left: 1.4em; }

.contact-grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 70px; }
.form-card { padding: 38px; background: var(--white); box-shadow: var(--shadow); }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 800; }
.field input, .field select, .field textarea { width: 100%; padding: 12px 13px; border: 1px solid #bdc6c5; border-radius: 8px; color: var(--ink); background: white; }
.field textarea { min-height: 120px; resize: vertical; }
.privacy-note, .form-status { color: #637276; font-size: 13px; }
.form-status { min-height: 24px; font-weight: 700; }

.admin-shell { min-height: 100vh; background: #e9eef0; }
.admin-header { padding: 24px 0; color: white; background: var(--ink); }
.admin-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.admin-header h1 { margin: 0; font-size: 26px; }
.admin-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 28px; padding: 34px 0 70px; }
.admin-nav { position: sticky; top: 20px; align-self: start; padding: 14px; border-radius: 12px; background: white; }
.admin-nav button { width: 100%; padding: 11px 12px; border: 0; border-radius: 8px; text-align: left; color: #3f555c; background: transparent; cursor: pointer; }
.admin-nav button.active { color: white; background: var(--ink); }
.admin-panel { display: none; }
.admin-panel.active { display: block; }
.admin-card { padding: 28px; margin-bottom: 18px; border-radius: 12px; background: white; }
.admin-card h2 { margin: 0 0 6px; font-size: 24px; }
.admin-card > p { margin-top: 0; color: #637276; }
.admin-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.admin-actions button { padding: 10px 15px; border: 1px solid #9badb1; border-radius: 8px; background: white; cursor: pointer; }
.admin-actions .save { color: white; border-color: var(--ink); background: var(--ink); }
.status-pill { display: inline-flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 999px; color: #1f5b45; background: #dff3e8; font-size: 12px; font-weight: 800; }
.status-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #2f9a6a; }

@media (max-width: 1040px) {
  .site-nav { gap: 16px; }
  .site-nav a:not(.nav-cta) { display: none; }
  .hero-grid { min-height: 650px; grid-template-columns: 1fr 1fr; }
  .hero-copy { padding-left: 32px; padding-right: 32px; }
  .section-head, .node-map, .detail-grid, .contact-grid { gap: 45px; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .wrap { width: min(calc(100% - 32px), var(--max)); }
  .site-header { position: relative; }
  .nav-shell { min-height: 68px; }
  .brand { min-width: 0; font-size: 13px; }
  .brand small { display: none; }
  .brand-mark { flex-basis: 34px; width: 34px; height: 34px; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 68px; align-items: stretch; padding: 18px 16px 24px; background: var(--ink); border-top: 1px solid var(--line-light); }
  .site-nav.open { display: grid; }
  .site-nav a:not(.nav-cta) { display: block; padding: 7px 4px; }
  .nav-cta { text-align: center; }
  .menu-button { display: inline-flex; }
  .hero-grid { min-height: auto; display: flex; flex-direction: column; }
  .hero-copy { padding: 56px 16px 36px; }
  .hero h1 { margin-bottom: 18px; font-size: clamp(40px, 11.4vw, 46px); line-height: 1.08; }
  .hero-lede { margin-bottom: 22px; font-size: 16px; line-height: 1.7; }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .hero-notes { display: none; }
  .hero-visual { height: 260px; border-left: 0; border-top: 1px solid var(--line-light); }
  .hero-keywords { top: 16px; left: 16px; right: 16px; gap: 8px; }
  .hero-keywords .kw-eyebrow { font-size: 12px; }
  .hero-keywords .kw-row { display: flex; flex-wrap: wrap; gap: 6px 14px; padding-left: 0; }
  .hero-keywords .kw-line { writing-mode: horizontal-tb; text-orientation: mixed; font-size: 15px; letter-spacing: .02em; text-shadow: 0 1px 6px rgba(7,28,36,.6); }
  .route-ticker { left: 16px; right: 16px; bottom: 16px; overflow: hidden; }
  .route-ticker span { white-space: nowrap; }
  .hero-visual .concept-label { top: 12px; bottom: auto; }
  .section { padding: 74px 0; }
  .section.tight { padding: 52px 0; }
  .section-head, .page-intro .wrap { display: grid; grid-template-columns: 1fr; gap: 24px; margin-bottom: 36px; }
  .section-head h2, .page-intro h1 { font-size: 40px; }
  .service-row { grid-template-columns: 48px 1fr 42px; gap: 12px; padding: 26px 0; }
  .service-row .num { grid-column: 1; }
  .service-row h3 { grid-column: 2; font-size: 23px; }
  .service-row p { grid-column: 2 / 4; }
  .service-row .arrow { grid-column: 3; grid-row: 1; }
  .node-map, .detail-grid, .contact-grid { grid-template-columns: 1fr; gap: 42px; }
  .node-map h2, .detail-aside { position: static; }
  .node-map h2 { font-size: 40px; }
  .split-feature { grid-template-columns: 1fr; min-height: 0; }
  .feature-media { height: 300px; }
  .feature-copy { padding: 54px 24px; }
  .feature-copy h2 { font-size: 43px; }
  .editorial-grid { grid-template-columns: 1fr; }
  .editorial-card { min-height: 310px; padding: 28px; }
  .final-cta .wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; }
  .page-intro { padding: 68px 0 56px; }
  .boundary-list { grid-template-columns: 1fr; }
  .page-intro .article-shell h1 { font-size: 38px; }
  .page-intro .article-shell > p { margin-top: 22px; }
  .page-intro h1.fit-mobile { font-size: 34px; }
  .mobile-only { display: inline; }
  br.mobile-only { display: block; }
  .desktop-only { display: none; }
  .form-card { padding: 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .admin-header .wrap { align-items: flex-start; flex-direction: column; }
  .admin-layout { grid-template-columns: 1fr; }
  .admin-nav { position: static; display: flex; gap: 8px; overflow-x: auto; }
  .admin-nav button { width: auto; min-width: max-content; }
  .admin-card { padding: 22px; }
}

@media (max-width: 420px) {
  .hero-copy { padding-top: 46px; }
  .hero h1 { font-size: 39px; }
  .hero-visual { height: 235px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
}