:root {
  --primary: #0F172A;
  --secondary: #334155;
  --accent: #0369A1;
  --accent-hover: #075985;
  --gold: #B45309;
  --bg: #F8FAFC;
  --fg: #020617;
  --card: #FFFFFF;
  --muted: #E8ECF1;
  --muted-fg: #475569;
  --border: #E2E8F0;
  --danger: #DC2626;
  --ring: #0369A1;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15,23,42,.06), 0 8px 24px rgba(15,23,42,.06);
  --font: "Plus Jakarta Sans", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.6; color: var(--fg); background: var(--bg); }
html[lang="zh"] body { line-height: 1.75; }
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.5rem); font-weight: 800; text-wrap: balance; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); font-weight: 800; text-wrap: balance; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--ring); outline-offset: 3px; border-radius: 6px; }

.container { width: min(1180px, 100% - 32px); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -60px; background: var(--primary); color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 100; }
.skip:focus { top: 12px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px; border-radius: 10px; font: 600 1rem/1 var(--font); text-decoration: none; border: 1.5px solid transparent; cursor: pointer; transition: background-color .2s, border-color .2s, color .2s, transform .2s; }
.btn:active { transform: translateY(1px); }
.btn--sm { min-height: 44px; padding: 0 16px; font-size: .95rem; }
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--secondary); }
.btn--accent { background: var(--accent); color: #fff; }
.btn--accent:hover { background: var(--accent-hover); }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.btn--ghost:hover { border-color: #fff; background: rgba(255,255,255,.06); }
.btn--block { width: 100%; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(248,250,252,.88); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--border); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.25rem; color: var(--primary); text-decoration: none; letter-spacing: -.02em; }
.brand__logo { height: 52px; width: auto; }
.footer .brand__logo { height: 48px; }
.nav__links { display: flex; gap: 28px; }
.nav__links a { color: var(--secondary); text-decoration: none; font-weight: 500; font-size: .95rem; padding: 8px 0; transition: color .2s; }
.nav__links a:hover { color: var(--accent); }
.nav__actions { display: flex; align-items: center; gap: 10px; }
.lang { min-height: 44px; padding: 0 30px 0 12px; border: 1px solid var(--border); border-radius: 10px; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center; appearance: none; font: 600 .9rem var(--font); color: var(--primary); cursor: pointer; }
.menu-btn { display: none; width: 44px; height: 44px; border: 1px solid var(--border); border-radius: 10px; background: #fff; color: var(--primary); cursor: pointer; padding: 10px; }
.mobile-menu { border-top: 1px solid var(--border); background: var(--bg); padding: 8px 16px 16px; }
.mobile-menu a { display: block; padding: 14px 4px; color: var(--primary); font-weight: 600; text-decoration: none; border-bottom: 1px solid var(--border); }

/* Hero */
.hero { background: radial-gradient(1200px 500px at 85% -10%, rgba(3,105,161,.35), transparent 60%), var(--primary); color: #fff; padding: clamp(56px, 8vw, 104px) 0; overflow: hidden; }
.hero__grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-size: .875rem; font-weight: 600; color: #BAE6FD; background: rgba(56,189,248,.1); border: 1px solid rgba(56,189,248,.25); padding: 6px 14px; border-radius: 999px; margin-bottom: 24px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #38BDF8; box-shadow: 0 0 0 4px rgba(56,189,248,.2); }
.lead { font-size: 1.125rem; color: #CBD5E1; max-width: 58ch; }
.hero__ctas { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 28px; }
.hero__trust { list-style: none; display: flex; flex-wrap: wrap; gap: 10px 24px; padding: 0; margin: 0; color: #E2E8F0; font-size: .95rem; }
.hero__trust li { display: flex; align-items: center; gap: 8px; }
.hero__trust svg { width: 18px; height: 18px; fill: none; stroke: #38BDF8; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }

.route-card { margin: 0; background: linear-gradient(180deg, rgba(30,41,59,.9), rgba(15,23,42,.9)); border: 1px solid rgba(148,163,184,.2); border-radius: 20px; padding: 16px; box-shadow: 0 30px 60px rgba(2,6,23,.4); }
.route-map { width: 100%; height: auto; }
.route-map text { fill: #CBD5E1; font: 600 12px var(--font); }
.route-line { stroke-dasharray: 600; stroke-dashoffset: 600; animation: draw 2.2s .3s ease-out forwards; }
.route-line--b { stroke-dasharray: 4 6; stroke-dashoffset: 0; animation: dash 1.6s linear infinite; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes dash { to { stroke-dashoffset: -20; } }
.route-card__foot { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 8px; }
.route-card__foot div { background: rgba(148,163,184,.08); border-radius: 12px; padding: 12px 14px; }
.route-card__foot strong { display: block; font-size: 1rem; }
.route-card__foot span { font-size: .85rem; color: #94A3B8; }

/* Stats */
.stats { background: var(--card); border-bottom: 1px solid var(--border); }
.stats__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 32px 20px; border-left: 1px solid var(--border); }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat strong { display: block; font-size: 2.25rem; font-weight: 800; color: var(--primary); line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted-fg); font-size: .95rem; }

/* Sections */
.section { padding: clamp(64px, 9vw, 112px) 0; }
.section--muted { background: var(--muted); }
.section--dark { background: var(--primary); color: #fff; }
.section__head { max-width: 680px; margin-bottom: 48px; }
.section__head p:last-child { color: var(--muted-fg); font-size: 1.075rem; }
.kicker { font-size: .8rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
.kicker--light { color: #7DD3FC; }

/* Routes */
.routes { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.route { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); border-top: 4px solid var(--accent); }
.route--alt { border-top-color: var(--gold); }
.route p { color: var(--muted-fg); }
.route__badge { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; font-size: .85rem; color: var(--primary); background: var(--muted); padding: 6px 12px; border-radius: 8px; margin-bottom: 20px; }
.route__badge svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.checks { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 12px; }
.checks li { position: relative; padding-left: 30px; }
.checks li::before { content: ""; position: absolute; left: 0; top: 3px; width: 20px; height: 20px; border-radius: 50%; background: #E0F2FE url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230369A1' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12l4 4 8-8'/%3E%3C/svg%3E") center/12px no-repeat; }
.route--alt .checks li::before { background-color: #FEF3C7; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23B45309' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12l4 4 8-8'/%3E%3C/svg%3E"); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: border-color .2s, box-shadow .2s, transform .2s; }
.card:hover { border-color: #BAE6FD; box-shadow: var(--shadow); transform: translateY(-2px); }
.card p { color: var(--muted-fg); margin: 0; }
.card__icon { width: 48px; height: 48px; border-radius: 12px; background: #E0F2FE; display: grid; place-items: center; margin-bottom: 18px; }
.card__icon svg { width: 24px; height: 24px; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; counter-reset: s; }
.step { position: relative; padding-top: 20px; border-top: 2px solid var(--border); }
.step::before { content: ""; position: absolute; top: -2px; left: 0; width: 40px; height: 2px; background: var(--accent); }
.step__n { display: block; font-weight: 800; color: var(--accent); font-size: .9rem; margin-bottom: 8px; font-variant-numeric: tabular-nums; }
.step p { color: var(--muted-fg); font-size: .95rem; margin: 0; }

/* Why */
.why { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.why__lead { color: #CBD5E1; font-size: 1.075rem; }
.why__list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.why__list li { background: rgba(148,163,184,.08); border: 1px solid rgba(148,163,184,.18); border-radius: var(--radius); padding: 24px; }
.why__list p { color: #CBD5E1; margin: 0; font-size: .95rem; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact__info > p { color: var(--muted-fg); font-size: 1.075rem; }
.contact__list { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; }
.contact__list li { display: flex; align-items: center; gap: 14px; font-weight: 600; }
.contact__list svg { width: 22px; height: 22px; flex: none; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.contact__list a { color: var(--primary); text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.contact__list a:hover { color: var(--accent); text-decoration: underline; }
.form { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 32px; box-shadow: var(--shadow); display: grid; gap: 18px; }
.field label { display: block; font-weight: 600; font-size: .95rem; margin-bottom: 6px; color: var(--primary); }
.field input, .field select, .field textarea { width: 100%; min-height: 48px; padding: 12px 14px; border: 1.5px solid #CBD5E1; border-radius: 10px; font: 400 1rem var(--font); color: var(--fg); background: #fff; transition: border-color .2s, box-shadow .2s; }
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(3,105,161,.18); }
.field__err { display: none; color: var(--danger); font-size: .875rem; margin: 6px 0 0; }
.field.is-invalid input, .field.is-invalid textarea { border-color: var(--danger); }
.field.is-invalid .field__err { display: block; }
.form__note { font-size: .85rem; color: var(--muted-fg); margin: 0; text-align: center; }

/* Footer */
.footer { background: #020617; color: #94A3B8; padding: 32px 0; font-size: .9rem; }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.footer p { margin: 0; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease-out, transform .5s ease-out; }
.reveal.is-in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1024px) {
  .steps { grid-template-columns: repeat(3, 1fr); row-gap: 36px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .menu-btn { display: inline-flex; }
  .hero__grid, .why, .contact, .routes { grid-template-columns: 1fr; gap: 40px; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 24px 16px; }
  .stat:nth-child(odd) { border-left: 0; padding-left: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
}
@media (max-width: 600px) {
  .brand__logo { height: 44px; }
  .cards, .why__list, .steps { grid-template-columns: 1fr; }
  .route, .form { padding: 24px; }
  .hero__ctas .btn { flex: 1 1 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .route-line { stroke-dashoffset: 0; }
  .reveal { opacity: 1; transform: none; }
}