:root {
  --ink: #172026;
  --muted: #637078;
  --paper: #f4f1ea;
  --card: #fffdf8;
  --line: #d8d4ca;
  --teal: #137c75;
  --teal-dark: #0d5652;
  --lime: #c8f560;
  --orange: #ff784f;
  --shadow: 0 18px 50px rgba(23, 32, 38, .10);
  --radius: 26px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(23,32,38,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,32,38,.035) 1px, transparent 1px),
    var(--paper);
  background-size: 28px 28px;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.72;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.container { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; top: -80px; left: 16px; z-index: 999; padding: 10px 16px; background: #fff; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid rgba(23,32,38,.1);
  background: rgba(244,241,234,.88);
  backdrop-filter: blur(18px);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 900; letter-spacing: -.02em; }
.brand img { width: 38px; height: 38px; border-radius: 11px; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 24px; }
.nav a { text-decoration: none; font-size: 14px; font-weight: 700; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--teal); }
.nav-cta, .button {
  display: inline-flex; justify-content: center; align-items: center; gap: 8px;
  min-height: 48px; padding: 0 22px; border: 2px solid var(--ink); border-radius: 14px;
  background: var(--lime); color: var(--ink); text-decoration: none; font-weight: 900;
  box-shadow: 4px 4px 0 var(--ink); transition: transform .2s, box-shadow .2s;
}
.nav-cta { min-height: 40px; padding-inline: 16px; }
.button:hover, .nav-cta:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); }
.button.secondary { background: transparent; box-shadow: none; }
.menu-toggle { display: none; margin-left: auto; border: 0; background: none; font-size: 27px; }

.hero { padding: 92px 0 76px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 72px; align-items: center; }
.eyebrow, .pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px;
  border: 1px solid var(--ink); border-radius: 999px; background: var(--card);
  font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em;
}
.eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--orange); }
h1 { margin: 22px 0 20px; font-size: clamp(46px, 7vw, 82px); line-height: .98; letter-spacing: -.065em; }
h1 em { color: var(--teal); font-style: normal; }
.lead { max-width: 640px; margin: 0; color: var(--muted); font-size: clamp(17px, 2vw, 21px); }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.facts { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 28px; padding: 0; list-style: none; color: var(--muted); font-size: 14px; }
.facts strong { color: var(--ink); }
.hero-visual { position: relative; }
.hero-frame { padding: 14px; border: 2px solid var(--ink); border-radius: 34px; background: var(--card); box-shadow: 12px 12px 0 var(--teal-dark); transform: rotate(1.5deg); }
.hero-frame img { width: 880px; height: auto; aspect-ratio: 880 / 700; object-fit: cover; border-radius: 22px; }
.float-note { position: absolute; right: -18px; bottom: 34px; padding: 13px 18px; border: 2px solid var(--ink); border-radius: 14px; background: var(--orange); color: #fff; font-weight: 900; transform: rotate(-5deg); }

.section { padding: 78px 0; }
.section.alt { border-block: 1px solid var(--line); background: rgba(255,253,248,.72); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 36px; }
.section-head h2, .page-intro h1 { margin: 10px 0 0; font-size: clamp(34px, 5vw, 58px); line-height: 1.08; letter-spacing: -.045em; }
.section-head p { max-width: 520px; margin: 0; color: var(--muted); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.card { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); box-shadow: 0 1px 0 #fff inset; }
.card .icon { display: grid; place-items: center; width: 46px; height: 46px; margin-bottom: 22px; border: 2px solid var(--ink); border-radius: 13px; background: var(--lime); font-size: 21px; font-weight: 900; }
.card h3 { margin: 0 0 10px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); }
.topic-card { position: relative; display: block; min-height: 210px; padding: 28px; border: 2px solid var(--ink); border-radius: var(--radius); background: var(--card); text-decoration: none; overflow: hidden; }
.topic-card::after { content: "↗"; position: absolute; right: 22px; bottom: 18px; font-size: 28px; font-weight: 900; }
.topic-card:nth-child(2) { background: #dff4f0; }
.topic-card:nth-child(3) { background: #ffe7dc; }
.topic-card h3 { margin: 32px 0 8px; font-size: 24px; }
.topic-card p { color: var(--muted); }

.split { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: start; }
.sticky-title { position: sticky; top: 120px; }
.feature-row { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.feature-row:first-child { padding-top: 0; }
.number { font-family: Georgia, serif; color: var(--teal); font-size: 36px; font-weight: 700; }
.feature-row h3 { margin: 0 0 7px; font-size: 23px; }
.feature-row p { margin: 0; color: var(--muted); }
.platform { text-align: center; }
.platform .icon { margin-inline: auto; }

.faq { border-top: 1px solid var(--line); }
details { padding: 22px 0; border-bottom: 1px solid var(--line); }
summary { cursor: pointer; list-style: none; font-size: 18px; font-weight: 800; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; color: var(--teal); font-size: 24px; }
details[open] summary::after { content: "−"; }
details p { max-width: 850px; margin-bottom: 0; color: var(--muted); }

.page-intro { padding: 76px 0 46px; }
.page-intro h1 { max-width: 900px; }
.page-intro .lead { margin-top: 20px; }
.crumbs { color: var(--muted); font-size: 14px; }
.crumbs a { text-decoration: none; }
.release-box { display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: center; padding: 34px; border: 2px solid var(--ink); border-radius: 30px; background: var(--teal-dark); color: white; }
.release-box p { margin: 6px 0 0; color: #bcd8d5; }
.release-box .button { border-color: #fff; box-shadow: 4px 4px 0 #fff; }
.download-card { display: flex; flex-direction: column; }
.download-card .button { margin-top: auto; }
.meta { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0 24px; }
.meta span { padding: 4px 9px; border-radius: 8px; background: #ece9e0; color: var(--muted); font-size: 13px; }
.notice { padding: 20px 24px; border-left: 5px solid var(--orange); border-radius: 0 16px 16px 0; background: #fff2ec; }
.steps { counter-reset: steps; display: grid; gap: 18px; }
.step { position: relative; padding: 26px 28px 26px 82px; border: 1px solid var(--line); border-radius: 20px; background: var(--card); }
.step::before { counter-increment: steps; content: counter(steps); position: absolute; left: 24px; top: 24px; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: var(--ink); color: white; font-weight: 900; }
.step h3 { margin: 0 0 7px; }
.step p { margin: 0; color: var(--muted); }
code { padding: 2px 7px; border-radius: 6px; background: #ece9e0; font-family: Consolas, monospace; }

.cta-band { padding: 42px; border: 2px solid var(--ink); border-radius: 32px; background: var(--lime); display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta-band h2 { margin: 0; font-size: clamp(28px, 4vw, 44px); letter-spacing: -.04em; }
.cta-band p { margin: 8px 0 0; }
.cta-band .button { background: var(--ink); color: #fff; box-shadow: 4px 4px 0 var(--teal); }

.site-footer { margin-top: 78px; padding: 56px 0 24px; background: var(--ink); color: white; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.footer-grid h3 { margin: 0 0 14px; font-size: 15px; color: var(--lime); }
.footer-grid ul { margin: 0; padding: 0; list-style: none; }
.footer-grid li { margin: 8px 0; }
.footer-grid a { color: #c7ced1; text-decoration: none; font-size: 14px; }
.footer-grid p { max-width: 430px; color: #abb5ba; font-size: 14px; }
.copyright { margin-top: 38px; padding-top: 22px; border-top: 1px solid #354148; color: #8d999f; font-size: 13px; }

.skeleton-screen { position: fixed; inset: 0; z-index: 1000; background: var(--paper); transition: opacity .4s, visibility .4s; }
.skeleton-inner { width: min(1160px, calc(100% - 40px)); margin: 0 auto; padding-top: 28px; }
.sk { border-radius: 12px; background: #dfdcd3; overflow: hidden; position: relative; }
.sk::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, rgba(255,255,255,.7), transparent); animation: shimmer 1.1s infinite; }
.sk-nav { height: 48px; width: 100%; }
.sk-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; margin-top: 86px; }
.sk-lines { display: grid; align-content: center; gap: 18px; }
.sk-line { height: 22px; }
.sk-line.big { height: 68px; width: 90%; }
.sk-line.short { width: 62%; }
.sk-image { height: min(430px, 47vw); border-radius: 30px; }
.ready .skeleton-screen { opacity: 0; visibility: hidden; pointer-events: none; }
.site-content { opacity: 0; transform: translateY(8px); transition: opacity .45s .08s, transform .45s .08s; }
.ready .site-content { opacity: 1; transform: none; }
@keyframes shimmer { to { transform: translateX(100%); } }

@media (max-width: 900px) {
  .nav { display: none; position: absolute; top: 76px; inset-inline: 0; padding: 22px; background: var(--card); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; }
  .nav.open { display: flex; }
  .menu-toggle { display: block; }
  .hero-grid, .split, .sk-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 60px; }
  .hero-visual { max-width: 680px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sticky-title { position: static; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1160px); }
  .hero { padding: 48px 0; }
  h1 { font-size: 46px; }
  .section { padding: 58px 0; }
  .section-head, .cta-band, .release-box { align-items: start; flex-direction: column; display: flex; }
  .grid-4, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .card { padding: 23px; }
  .float-note { right: 0; bottom: 16px; }
  .cta-band { padding: 28px; }
  .sk-grid { margin-top: 56px; }
  .sk-image { height: 280px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
  .skeleton-screen { display: none; }
  .site-content { opacity: 1; transform: none; }
}