:root {
  --ink: #1d2935;
  --muted: #627181;
  --paper: #f5f8fa;
  --surface: #ffffff;
  --line: #dce5eb;
  --accent: #e7655d;
  --accent-dark: #b94c48;
  --secondary: #6872a7;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); 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; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(245,248,250,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 0; }
.brand-mark { display: block; width: 34px; height: 34px; flex: 0 0 34px; border-radius: 8px; object-fit: cover; }
.site-nav { display: flex; align-items: center; gap: 24px; color: var(--muted); font-size: 14px; }
.site-nav a { transition: color .2s ease; }
.site-nav a:hover, .site-nav a.active { color: var(--ink); }
.site-nav .nav-download, .site-nav .nav-ios { padding: 8px 14px; border-radius: 6px; }
.nav-download { color: #fff !important; background: var(--accent); }
.nav-ios { border: 1px solid var(--line); background: var(--surface); }
.menu-toggle { display: none; border: 0; background: transparent; padding: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 4px 0; background: var(--ink); }
.hero { overflow: hidden; padding: 84px 0 74px; background: linear-gradient(110deg, #eef3f6 0%, #f5f8fa 55%, #edf0f8 100%); border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; grid-template-columns: minmax(0, .92fr) minmax(420px, 1.08fr); gap: 72px; align-items: center; }
.hero-copy { max-width: 520px; }
.eyebrow { margin: 0 0 12px; color: var(--accent-dark); font-size: 11px; font-weight: 700; letter-spacing: 0; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 480px; margin-bottom: 20px; font-size: clamp(34px, 4.5vw, 58px); line-height: 1.16; letter-spacing: 0; }
.hero-lead { max-width: 490px; margin-bottom: 28px; color: var(--muted); font-size: 17px; }
.hero-actions, .download-actions, .article-links { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 20px; border-radius: 6px; font-size: 14px; font-weight: 700; border: 1px solid transparent; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover { background: var(--accent-dark); }
.button-secondary { color: var(--accent-dark); border-color: #efaaa5; background: #fff5f3; }
.button-light { color: var(--ink); background: #fff; border-color: rgba(255,255,255,.6); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 36px; color: var(--muted); font-size: 12px; }
.hero-meta strong { margin-right: 5px; color: var(--accent-dark); font-size: 11px; }
.hero-media { min-width: 0; padding: 20px; border: 1px solid #d2dde5; border-radius: 16px; background: rgba(255,255,255,.72); box-shadow: 0 20px 55px rgba(44,61,75,.1); }
.media-label { margin-bottom: 14px; color: var(--secondary); font-size: 11px; font-weight: 700; letter-spacing: 0; }
.hero-figure { margin: 0; padding: 12px; border-radius: 10px; background: #e9eef2; }
.hero-figure img { width: 100%; max-width: 400px; margin: 0 auto; border-radius: 6px; }
.hero-figure figcaption { padding: 10px 2px 0; color: var(--muted); font-size: 12px; }
.media-tabs { display: flex; gap: 8px; margin-top: 16px; }
.media-tabs span { flex: 1; padding: 9px 7px; border: 1px solid var(--line); border-radius: 5px; color: var(--muted); background: #fff; text-align: center; font-size: 12px; }
.media-tabs span:first-child { border-color: #edb2ad; color: var(--accent-dark); background: #fff4f2; }
.section { padding: 92px 0; }
.showcase-section { background: var(--surface); }
.section-heading { margin-bottom: 30px; }
.section-heading h2 { margin-bottom: 0; font-size: 32px; line-height: 1.2; }
.section-note { max-width: 430px; margin: 16px 0 0; color: var(--muted); }
.showcase-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.showcase-card { display: flex; min-height: 100%; flex-direction: column; overflow: hidden; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.showcase-card-wide { display: grid; grid-template-columns: 1.1fr .9fr; }
.showcase-card img { width: 100%; object-fit: cover; }
.showcase-card-wide img { height: 100%; min-height: 205px; }
.showcase-card > div { padding: 22px; }
.card-kicker { color: var(--secondary); font-size: 10px; font-weight: 700; letter-spacing: 0; }
.showcase-card h3 { margin: 8px 0 8px; font-size: 20px; }
.showcase-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.feature-section { background: #edf2f5; }
.feature-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 76px; align-items: start; }
.feature-list { border-top: 1px solid #cbd7df; }
.feature-row { display: grid; grid-template-columns: 42px 1fr 30px; gap: 18px; align-items: center; padding: 22px 0; border-bottom: 1px solid #cbd7df; }
.feature-number { color: var(--accent-dark); font-size: 12px; font-weight: 700; }
.feature-row h3 { margin: 0 0 4px; font-size: 18px; }
.feature-row p { margin: 0; color: var(--muted); font-size: 14px; }
.feature-arrow { color: var(--secondary); font-size: 20px; text-align: right; }
.scenario-section { background: #fff; }
.section-heading-inline { display: flex; justify-content: space-between; align-items: end; gap: 24px; }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--accent-dark); font-size: 14px; font-weight: 700; }
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.scenario-grid article { padding: 22px; border-top: 3px solid var(--secondary); background: #f3f6f8; }
.scenario-tag { color: var(--secondary); font-size: 12px; font-weight: 700; }
.scenario-grid p { margin: 14px 0 0; color: var(--muted); font-size: 14px; }
.faq-preview-section { padding-top: 80px; }
.faq-preview { display: grid; grid-template-columns: .65fr 1.35fr; gap: 48px; align-items: start; }
.faq-preview-list { border-top: 1px solid var(--line); }
.faq-preview-list a { display: flex; justify-content: space-between; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.faq-preview-list a:hover { color: var(--accent-dark); }
.download-strip { padding: 54px 0; color: #fff; background: var(--ink); }
.download-strip-inner { display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.download-strip h2 { margin-bottom: 8px; font-size: 28px; }
.download-note { color: #c4d0d8; font-size: 14px; }
.site-footer { padding: 28px 0; background: #17222c; color: #afbdc7; font-size: 12px; }
.footer-inner { display: grid; grid-template-columns: auto auto 1fr; gap: 20px; align-items: center; }
.footer-inner p { margin: 0; }
.footer-inner p:last-child { text-align: right; }
.footer-inner nav { display: flex; gap: 14px; }
.footer-inner a:hover { color: #fff; }
.inner-page { padding: 78px 0 100px; }
.narrow-container { max-width: 820px; }
.inner-page h1 { max-width: 700px; font-size: clamp(34px, 5vw, 52px); }
.page-intro { max-width: 700px; color: var(--muted); font-size: 17px; }
.guide-toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 34px 0 54px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.guide-toc a { padding: 8px 12px; border: 1px solid var(--line); border-radius: 5px; color: var(--muted); background: #fff; font-size: 13px; }
.guide-toc a:hover { border-color: #efaaa5; color: var(--accent-dark); }
.article-section { margin: 0 0 48px; }
.article-section h2 { margin-bottom: 14px; font-size: 25px; }
.article-section p { color: #435260; font-size: 15px; }
.detailed-faq { margin-top: 42px; border-top: 1px solid var(--line); }
.detailed-faq details { padding: 20px 0; border-bottom: 1px solid var(--line); }
.detailed-faq summary { cursor: pointer; padding-right: 24px; font-weight: 700; list-style-position: outside; }
.detailed-faq p { margin: 13px 0 0 20px; color: var(--muted); font-size: 15px; }
.detailed-faq a { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.article-links { margin-top: 54px; }
@media (max-width: 860px) {
  .container { width: min(calc(100% - 36px), var(--max)); }
  .menu-toggle { display: block; }
  .site-nav { position: absolute; top: 72px; left: 18px; right: 18px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 15px 35px rgba(24,39,51,.12); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 11px 12px; }
  .hero { padding: 32px 0 8px; }
  .hero-inner, .feature-layout, .faq-preview { grid-template-columns: 1fr; gap: 38px; }
  .hero-copy { max-width: none; }
  .hero-media { order: 2; }
  .showcase-grid { grid-template-columns: 1fr; }
  .showcase-card-wide { grid-template-columns: 1fr; }
  .showcase-card-wide img { min-height: auto; height: auto; }
  .scenario-grid { grid-template-columns: 1fr; }
  .download-strip-inner { align-items: flex-start; flex-direction: column; }
  .footer-inner { grid-template-columns: 1fr; gap: 10px; }
  .footer-inner p:last-child { text-align: left; }
}
@media (max-width: 520px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  h1 { font-size: 36px; }
  .hero-lead { font-size: 15px; }
  .hero-meta { gap: 9px 14px; margin-top: 16px; }
  .hero-media { padding: 12px; }
  .media-tabs span { font-size: 11px; }
  .section { padding: 68px 0; }
  .section-heading-inline { align-items: flex-start; flex-direction: column; gap: 12px; }
  .feature-row { grid-template-columns: 30px 1fr; gap: 12px; }
  .feature-arrow { display: none; }
  .button { width: 100%; }
  .hero-actions, .download-actions, .article-links { align-items: stretch; flex-direction: column; }
  .inner-page { padding: 54px 0 72px; }
}