:root { --ink:#182b3b; --muted:#657889; --paper:#faf9f6; --surface:#fff; --line:#dfe5e3; --navy:#183d55; --mint:#5fa494; --soft:#e8f1ec; --max:1180px; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; color:var(--ink); background:var(--paper); font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif; line-height:1.7; }
a { color:inherit; text-decoration:none; }
img { display:block; max-width:100%; height:auto; }
.container { width:min(calc(100% - 48px),var(--max)); margin:0 auto; }
.masthead { border-bottom:1px solid var(--line); background:rgba(250,249,246,.96); position:sticky; top:0; z-index:20; }
.masthead-inner { min-height:70px; display:flex; align-items:center; justify-content:space-between; gap:28px; }
.wordmark { display:flex; align-items:center; gap:10px; font-weight:700; }
.wordmark-dot { display:block; width:34px; height:34px; flex:0 0 34px; border-radius:8px; object-fit:cover; }
.main-nav { display:flex; align-items:center; gap:22px; color:var(--muted); font-size:14px; }
.main-nav a:hover,.main-nav a.active { color:var(--navy); }
.main-nav .download-link,.main-nav .ios-link { padding:8px 14px; border-radius:4px; }
.download-link { color:#fff!important; background:var(--navy); }
.ios-link { border:1px solid var(--line); background:#fff; }
.menu-toggle { display:none; border:0; padding:8px; background:transparent; }
.menu-toggle span { display:block; width:22px; height:2px; margin:5px 0; background:var(--ink); }
.hero-rail { padding:78px 0 96px; background:#f1f5f1; border-bottom:1px solid var(--line); }
.hero-direct { position:absolute; width:1px; height:1px; opacity:0; pointer-events:none; }
.hero-rail-inner { display:grid; grid-template-columns:28px minmax(0,.78fr) minmax(420px,1.22fr); gap:32px; align-items:center; }
.rail-index { align-self:stretch; display:flex; flex-direction:column; justify-content:center; align-items:center; gap:24px; color:#9aaba7; font-size:11px; }
.rail-index span { position:relative; }
.rail-index span:not(:last-child)::after { content:""; position:absolute; left:50%; top:20px; width:1px; height:21px; background:#c9d6d0; }
.rail-current { color:var(--navy); font-weight:700; }
.section-code { margin:0 0 12px; color:var(--mint); font-size:11px; font-weight:700; letter-spacing:0; }
h1,h2,h3,p { margin-top:0; }
h1 { max-width:460px; margin-bottom:22px; font-size:clamp(34px,4.2vw,56px); line-height:1.13; letter-spacing:0; }
.hero-copy h1 { font-size:clamp(34px,3.2vw,46px); }
.lead { max-width:500px; margin-bottom:28px; color:var(--muted); font-size:17px; }
.hero-actions { display:flex; flex-wrap:wrap; gap:12px; }
.button { display:inline-flex; min-height:44px; padding:0 20px; align-items:center; justify-content:center; border-radius:4px; font-size:14px; font-weight:700; transition:transform .2s ease,background .2s ease; }
.button:hover { transform:translateY(-1px); }
.button-dark { color:#fff; background:var(--navy); }
.button-dark:hover { background:#102e43; }
.button-outline { color:var(--navy); border:1px solid #a8bbb6; background:transparent; }
.button-light { color:var(--navy); background:#fff; }
.button-soft { color:var(--navy); background:#dcece5; }
.quick-facts { display:flex; gap:28px; margin:36px 0 0; }
.quick-facts div { padding-left:12px; border-left:2px solid var(--mint); }
.quick-facts dt { color:var(--muted); font-size:11px; }
.quick-facts dd { margin:3px 0 0; font-size:13px; }
.hero-stack { position:relative; min-height:390px; padding:28px 34px; }
.stack-caption { margin-bottom:14px; color:var(--mint); font-size:10px; font-weight:700; letter-spacing:0; }
.stack-main { position:relative; z-index:2; width:min(100%,520px); margin:0 auto; padding:14px; border:1px solid #cddbd4; background:#fff; box-shadow:0 18px 38px rgba(24,61,85,.12); transform:rotate(-1.2deg); }
.stack-main img { width:100%; max-width:400px; margin:0 auto; }
.stack-small { position:absolute; z-index:3; width:43%; padding:8px; border:1px solid #d7e2de; background:#fff; box-shadow:0 12px 28px rgba(24,61,85,.13); }
.stack-small img { width:100%; }
.stack-small-a { left:0; bottom:24px; transform:rotate(2deg); }
.stack-small-b { right:0; top:88px; transform:rotate(3deg); }
.stack-note { position:absolute; right:18px; bottom:0; color:var(--muted); font-size:11px; letter-spacing:0; }
.overview-band { padding:78px 0; background:#fff; }
.band-title { display:flex; align-items:end; justify-content:space-between; gap:24px; border-bottom:1px solid var(--line); }
.band-title h2,.matrix-header h2,.gallery-head h2,.notice-inner h2,.question-title h2,.final-call h2 { margin:0 0 18px; font-size:32px; line-height:1.2; }
.overview-grid { display:grid; grid-template-columns:1fr 1fr; gap:70px; padding-top:26px; }
.overview-grid > p { max-width:520px; color:var(--muted); font-size:16px; }
.overview-stats { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.overview-stats div { padding:13px 0; border-top:2px solid var(--navy); }
.overview-stats strong { display:block; color:var(--mint); font-size:12px; }
.overview-stats span { display:block; margin-top:8px; font-size:13px; }
.feature-matrix { padding:88px 0; background:#f0f4f1; }
.matrix-header { display:flex; align-items:baseline; gap:28px; flex-wrap:wrap; margin-bottom:30px; }
.matrix-header h2 { margin-bottom:0; }
.heading-note { color:var(--muted); font-size:14px; }
.notice-inner .heading-note { max-width:620px; color:#c9d8dc; }
.final-call .heading-note { color:var(--muted); font-size:14px; }
.matrix-table { display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid #cbd8d2; border-left:1px solid #cbd8d2; }
.matrix-table article { min-height:260px; display:flex; flex-direction:column; padding:24px; border-right:1px solid #cbd8d2; border-bottom:1px solid #cbd8d2; background:#f8faf8; }
.matrix-table article > span { color:var(--mint); font-size:11px; font-weight:700; }
.matrix-table h3 { margin:36px 0 10px; font-size:20px; }
.matrix-table p { margin-bottom:20px; color:var(--muted); font-size:14px; }
.matrix-table a { margin-top:auto; color:var(--navy); font-size:13px; font-weight:700; }
.matrix-table a span { margin-left:5px; color:var(--mint); }
.gallery-band { padding:90px 0; background:#fff; }
.gallery-head { display:flex; justify-content:space-between; align-items:end; gap:30px; margin-bottom:32px; }
.gallery-head > p { max-width:360px; margin:0; color:var(--muted); font-size:14px; }
.scene-columns { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.scene-columns article { padding:24px; border:1px solid var(--line); background:#fbfcfa; }
.scene-no { display:grid; place-items:center; width:28px; height:28px; border-radius:50%; color:var(--navy); background:var(--soft); font-size:12px; font-weight:700; }
.scene-columns h3 { margin:26px 0 8px; font-size:19px; }
.scene-columns p { margin:0; color:var(--muted); font-size:14px; }
.notice-section { padding:70px 0; background:var(--navy); color:#fff; }
.notice-inner { display:flex; justify-content:space-between; align-items:end; gap:36px; }
.notice-inner .section-code { color:#a8d4c4; }
.notice-inner h2 { margin-bottom:10px; }
.notice-inner p:not(.section-code) { max-width:620px; margin:0; color:#c9d8dc; font-size:14px; }
.text-link { display:inline-flex; align-items:center; gap:8px; color:var(--mint); font-size:14px; font-weight:700; white-space:nowrap; }
.question-section { padding:82px 0; background:#fff; }
.question-inner { display:grid; grid-template-columns:.7fr 1.3fr; gap:76px; }
.question-title p:last-child { color:var(--muted); font-size:14px; }
.question-links { border-top:1px solid var(--line); }
.question-links a { display:flex; justify-content:space-between; gap:20px; padding:17px 0; border-bottom:1px solid var(--line); color:var(--muted); }
.question-links a:hover { color:var(--navy); }
.question-links b { color:var(--mint); font-size:11px; }
.question-links .text-link { padding-top:22px; border:0; color:var(--navy); }
.final-call { padding:58px 0; background:#e9f0ec; }
.final-call-inner { display:flex; justify-content:space-between; align-items:center; gap:30px; }
.final-call h2 { margin-bottom:8px; }
.final-call p:not(.section-code) { margin:0; color:var(--muted); font-size:14px; }
.site-footer { padding:28px 0; color:#c6d0d0; background:#112b3b; font-size:12px; }
.footer-inner { display:grid; grid-template-columns:auto auto 1fr; gap:22px; align-items:center; }
.footer-inner nav { display:flex; gap:15px; }
.footer-inner a:hover { color:#fff; }
.footer-inner span:last-child { text-align:right; }
.reading-page { padding:76px 0 100px; }
.reading-layout { display:grid; grid-template-columns:280px minmax(0,700px); gap:80px; align-items:start; }
.side-index { position:sticky; top:108px; }
.side-index h1 { margin-bottom:28px; font-size:36px; }
.side-index nav { display:flex; flex-direction:column; gap:10px; padding-left:14px; border-left:2px solid #cddbd4; }
.side-index nav a { color:var(--muted); font-size:14px; }
.side-index nav a:hover { color:var(--navy); }
.reading-content { min-width:0; }
.intro-copy { margin-bottom:46px; color:var(--muted); font-size:17px; }
.reading-content section { margin-bottom:48px; }
.reading-content h2 { margin-bottom:14px; font-size:25px; }
.reading-content p { color:#455c6c; font-size:15px; }
.reading-actions { display:flex; flex-wrap:wrap; align-items:center; gap:12px; margin-top:56px; }
.faq-layout { display:grid; grid-template-columns:300px minmax(0,760px); gap:70px; align-items:start; }
.faq-intro { position:sticky; top:108px; }
.faq-intro h1 { margin-bottom:18px; font-size:38px; }
.faq-intro > p:not(.section-code) { color:var(--muted); font-size:15px; }
.faq-shortcuts { display:flex; flex-wrap:wrap; gap:8px; margin-top:28px; }
.faq-shortcuts a { padding:7px 10px; border:1px solid var(--line); color:var(--muted); font-size:12px; }
.faq-shortcuts a:hover { color:var(--navy); border-color:#a8bbb6; }
.faq-accordion { border-top:1px solid var(--line); }
.faq-accordion details { padding:20px 0; border-bottom:1px solid var(--line); }
.faq-accordion summary { cursor:pointer; padding-right:20px; font-weight:700; }
.faq-accordion p { margin:12px 0 0 18px; color:var(--muted); font-size:15px; }
.faq-accordion a { color:var(--navy); text-decoration:underline; text-underline-offset:3px; }
@media (max-width:880px) {
  .container { width:min(calc(100% - 36px),var(--max)); }
  .menu-toggle { display:block; }
  .main-nav { position:absolute; top:70px; left:18px; right:18px; display:none; flex-direction:column; align-items:stretch; gap:0; padding:10px; border:1px solid var(--line); background:#fff; box-shadow:0 15px 30px rgba(24,61,85,.13); }
  .main-nav.is-open { display:flex; }
  .main-nav a { padding:10px 12px; }
  .hero-rail { padding:54px 0 68px; }
  .hero-rail-inner { grid-template-columns:1fr; gap:28px; }
  .rail-index { display:none; }
  .hero-stack { min-height:340px; padding:20px 12px; }
  .overview-grid,.question-inner,.reading-layout,.faq-layout { grid-template-columns:1fr; gap:38px; }
  .side-index,.faq-intro { position:static; }
  .matrix-table,.scene-columns { grid-template-columns:1fr; }
  .matrix-table article { min-height:220px; }
  .notice-inner,.final-call-inner,.gallery-head { align-items:flex-start; flex-direction:column; }
  .footer-inner { grid-template-columns:1fr; gap:10px; }
  .footer-inner span:last-child { text-align:left; }
}
@media (max-width:520px) {
  .container { width:min(calc(100% - 28px),var(--max)); }
  h1 { font-size:36px; }
  .hero-rail { padding:36px 0 12px; }
  .lead { font-size:15px; }
  .hero-actions,.reading-actions { flex-direction:column; align-items:stretch; }
  .button { width:100%; }
  .quick-facts { gap:15px; flex-wrap:wrap; }
  .hero-stack { min-height:265px; padding:16px 0; }
  .stack-small { width:45%; }
  .stack-note { right:2px; }
  .overview-grid { gap:24px; }
  .overview-stats { gap:8px; }
  .overview-stats span { font-size:12px; }
  .reading-page { padding:52px 0 72px; }
  .side-index h1,.faq-intro h1 { font-size:34px; }
}