@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&display=swap");

:root {
  --ink: #0d0c0a;
  --coal: #17130f;
  --coal-2: #211a13;
  --parchment: #d7c29a;
  --parchment-soft: #eadfca;
  --bronze: #9b6b2f;
  --gold: #d8ad55;
  --gold-bright: #f0ca78;
  --ember: #8b2f24;
  --moss: #44543a;
  --muted: #aa9a7f;
  --line: rgba(216, 173, 85, 0.28);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
  --content: 1180px;
  --display: "Noto Serif SC", "Microsoft YaHei", "SimSun", serif;
  --body: "Noto Serif SC", "Songti SC", "SimSun", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--parchment-soft); background: var(--ink); font-family: var(--body); line-height: 1.75; }
body::before { content: ""; position: fixed; inset: 0; z-index: -2; background: radial-gradient(circle at 12% 8%, rgba(139,47,36,.16), transparent 32%), radial-gradient(circle at 87% 40%, rgba(155,107,47,.13), transparent 28%), linear-gradient(135deg, transparent 0 48%, rgba(216,173,85,.025) 48% 49%, transparent 49% 100%); background-size: auto, auto, 42px 42px; }
body::after { content: ""; position: fixed; inset: 0; z-index: -1; opacity: .22; pointer-events: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180' viewBox='0 0 180 180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.12'/%3E%3C/svg%3E"); }
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 8px 14px; color: var(--ink); background: var(--gold-bright); transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(13,12,10,.93); backdrop-filter: blur(14px); }
.header-inner { width: min(calc(100% - 36px), var(--content)); min-height: 78px; margin: auto; display: flex; align-items: center; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; flex: 0 0 auto; }
.brand-seal { width: 46px; height: 46px; display: grid; place-items: center; border: 1px solid var(--gold); border-radius: 50%; color: var(--gold-bright); background: radial-gradient(circle, #5d1f19 0 45%, #17110c 47%); box-shadow: inset 0 0 0 4px #24170e, 0 0 24px rgba(216,173,85,.12); font-family: Georgia, serif; font-size: 26px; }
.brand strong { display: block; color: var(--gold-bright); font-family: Georgia, var(--display); font-size: 25px; letter-spacing: .03em; line-height: 1; }
.brand small { display: block; margin-top: 5px; color: var(--muted); font-size: 11px; letter-spacing: .14em; }
#site-nav { display: flex; align-items: center; justify-content: flex-end; gap: 25px; flex: 1; }
#site-nav a { position: relative; padding: 26px 0 22px; color: #c9b895; font-size: 14px; text-decoration: none; white-space: nowrap; }
#site-nav a:hover, #site-nav a[aria-current="page"] { color: var(--gold-bright); }
#site-nav a[aria-current="page"]::after { content: ""; position: absolute; left: 12%; right: 12%; bottom: 15px; height: 1px; background: var(--ember); box-shadow: 0 0 8px var(--ember); }
.nav-toggle { display: none; }
.hero { width: min(calc(100% - 36px), var(--content)); min-height: 620px; margin: 0 auto; padding: 82px 0 72px; display: grid; grid-template-columns: minmax(0, .86fr) minmax(460px, 1.14fr); align-items: center; gap: 60px; border-bottom: 1px solid var(--line); }
body:not([data-page="index"]) .hero { min-height: 470px; padding-top: 70px; }
body:not([data-page="index"]) .hero:not(:has(.hero-visual)) { grid-template-columns: minmax(0, 800px); }
.hero-copy { position: relative; z-index: 2; }
.eyebrow { margin: 0 0 14px; color: var(--gold); font: 600 12px/1.4 Georgia, serif; letter-spacing: .24em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; font-family: var(--display); font-weight: 700; line-height: 1.25; }
h1 { max-width: 760px; margin-bottom: 24px; color: var(--gold-bright); font-size: clamp(42px, 5.4vw, 76px); letter-spacing: .02em; text-wrap: balance; text-shadow: 0 2px 24px rgba(0,0,0,.7); }
body:not([data-page="index"]) h1 { font-size: clamp(40px, 4.6vw, 64px); }
.hero-lead { max-width: 680px; margin: 0 0 25px; color: #c8b99f; font-size: 17px; }
.version-badge { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 28px; padding: 8px 13px; border: 1px solid var(--line); color: var(--gold); background: rgba(0,0,0,.25); font-size: 12px; }
.version-badge i { width: 3px; height: 3px; border-radius: 50%; background: var(--ember); }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; }
.cta { min-height: 50px; padding: 13px 20px; display: inline-flex; align-items: center; justify-content: space-between; gap: 24px; border: 1px solid var(--bronze); color: var(--parchment-soft); text-decoration: none; background: rgba(28,21,15,.72); transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.cta:hover { transform: translateY(-2px); border-color: var(--gold-bright); }
.cta-primary { background: linear-gradient(180deg, #9d382a, #6f211b); border-color: #c05a40; box-shadow: 0 10px 24px rgba(80,20,14,.25); }
.cta-secondary { background: linear-gradient(180deg, rgba(61,44,27,.82), rgba(28,21,15,.9)); }
.hero-visual, .section-figure, .card-media { position: relative; margin: 0; border: 1px solid var(--bronze); background: #090806; box-shadow: var(--shadow); overflow: hidden; }
.hero-visual::before, .section-figure::before { content: ""; position: absolute; inset: 9px; z-index: 1; border: 1px solid rgba(240,202,120,.5); pointer-events: none; }
.hero-visual img { width: 100%; aspect-ratio: 16/10; object-fit: cover; object-position: var(--focus); filter: saturate(.87) contrast(1.05); }
.hero-visual figcaption, .section-figure figcaption { padding: 10px 14px; color: var(--muted); background: #100d09; font-size: 12px; }
.page-content { width: min(calc(100% - 36px), var(--content)); margin: auto; }
.content-section { padding: 88px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 90px; }
.section-heading { max-width: 760px; margin-bottom: 36px; }
.section-heading h2 { margin-bottom: 14px; color: var(--gold-bright); font-size: clamp(30px, 4vw, 48px); }
.section-heading > p:last-child:not(.eyebrow) { margin: 0; color: #bcae94; font-size: 16px; }
.card-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.card { position: relative; min-height: 220px; padding: 24px; border: 1px solid var(--line); color: inherit; background: linear-gradient(145deg, rgba(38,29,20,.78), rgba(17,14,10,.82)); text-decoration: none; overflow: hidden; }
.card::after { content: ""; position: absolute; right: -20px; bottom: -20px; width: 75px; height: 75px; border: 1px solid rgba(216,173,85,.12); transform: rotate(45deg); }
.card-link { transition: transform .2s ease, border-color .2s ease; }
.card-link:hover { transform: translateY(-4px); border-color: rgba(240,202,120,.64); }
.card h3 { margin: 8px 0 10px; color: var(--parchment-soft); font-size: 21px; }
.card p { margin: 0; color: #aa9d88; font-size: 14px; }
.card-meta { color: var(--gold) !important; font: 600 11px/1.4 Georgia, serif !important; letter-spacing: .12em; text-transform: uppercase; }
.text-link { display: block; margin-top: 20px; color: var(--gold); font-size: 13px; }
.card-media { margin: -24px -24px 20px; border-width: 0 0 1px; box-shadow: none; }
.card-media img { width: 100%; aspect-ratio: 16/9; object-fit: cover; object-position: var(--focus); opacity: .82; transition: opacity .2s ease, transform .3s ease; }
.card:hover .card-media img { opacity: 1; transform: scale(1.02); }
.card-media figcaption { display: none; }
.section-figure { margin: 0 0 30px; }
.section-figure img { width: 100%; max-height: 620px; object-fit: cover; object-position: var(--focus); }
.steps, .timeline { margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; list-style: none; }
.steps li, .timeline li { padding: 26px; display: flex; gap: 18px; border-top: 1px solid var(--bronze); background: rgba(29,23,17,.46); }
.steps li > span, .timeline li > span { color: var(--gold); font: 20px/1 Georgia, serif; }
.steps h3, .timeline h3 { margin-bottom: 8px; color: var(--parchment-soft); font-size: 19px; }
.steps p, .timeline p { margin: 0; color: var(--muted); font-size: 14px; }
.timeline { grid-template-columns: 1fr; }
.timeline li { align-items: baseline; }
.timeline li > span { min-width: 45px; }
.accordions { max-width: 900px; }
.accordions details { border-top: 1px solid var(--line); }
.accordions details:last-child { border-bottom: 1px solid var(--line); }
.accordions summary { padding: 19px 4px; color: var(--parchment-soft); cursor: pointer; font-family: var(--display); font-size: 18px; }
.accordions details p { margin: -4px 0 20px; color: var(--muted); }
.cta-panel { margin: 70px 0; padding: 48px; border: 1px solid rgba(168,62,45,.72); background: linear-gradient(100deg, rgba(93,27,22,.8), rgba(30,20,14,.9)); }
.cta-panel .section-heading { margin-bottom: 24px; }
.download-card, .wechat-layout { padding: 34px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; border: 1px solid var(--line); background: rgba(28,22,16,.72); }
.version-kicker { color: var(--gold); }
.download-card h3 { color: var(--parchment-soft); font-size: 24px; overflow-wrap: anywhere; }
.download-card dl { margin: 22px 0 0; }
.download-card dl div { display: grid; grid-template-columns: 100px 1fr; gap: 15px; margin-top: 8px; }
.download-card dt { color: var(--muted); }
.download-card dd { margin: 0; }
.hash { color: var(--gold-bright); font-family: Consolas, monospace; font-size: 12px; overflow-wrap: anywhere; }
.download-actions { display: grid; gap: 10px; }
.is-pending { cursor: not-allowed; opacity: .75; }
.copy-button { padding: 10px 15px; border: 1px solid var(--line); color: var(--parchment); background: transparent; cursor: pointer; }
.wechat-layout { grid-template-columns: 210px 1fr; }
.wechat-layout img { width: 210px; background: var(--parchment-soft); }
.wechat-layout h3 { color: var(--gold-bright); font-size: 25px; }
.small-note { color: var(--muted); font-size: 13px; }
.site-footer { width: min(calc(100% - 36px), var(--content)); margin: 0 auto; padding: 52px 0 90px; display: flex; justify-content: space-between; gap: 30px; color: var(--muted); font-size: 13px; }
.site-footer > div:last-child { text-align: right; }
.site-footer p { margin: 8px 0 0; }
.footer-brand .brand-seal { width: 38px; height: 38px; font-size: 21px; }
.mobile-actions { display: none; }
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1040px) {
  #site-nav { gap: 15px; }
  #site-nav a { font-size: 12px; }
  .hero { grid-template-columns: 1fr 1fr; gap: 32px; }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .header-inner { min-height: 66px; }
  .brand-seal { width: 39px; height: 39px; font-size: 22px; }
  .brand strong { font-size: 21px; }
  .nav-toggle { margin-left: auto; width: 48px; height: 44px; padding: 9px; display: grid; align-content: center; gap: 5px; border: 0; color: var(--gold); background: transparent; cursor: pointer; }
  .nav-toggle span { width: 24px; height: 1px; display: block; background: currentColor; }
  .nav-toggle b { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  #site-nav { position: absolute; top: 66px; left: 0; right: 0; padding: 10px 18px 20px; display: none; align-items: stretch; flex-direction: column; gap: 0; border-bottom: 1px solid var(--line); background: rgba(13,12,10,.98); }
  #site-nav[data-open] { display: flex; }
  #site-nav a { padding: 12px 3px; border-bottom: 1px solid rgba(216,173,85,.12); font-size: 14px; }
  #site-nav a[aria-current="page"]::after { display: none; }
  .hero, body:not([data-page="index"]) .hero { min-height: auto; padding: 54px 0; grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  h1 { font-size: clamp(38px, 10vw, 58px); }
  .steps { grid-template-columns: 1fr; }
  .download-card { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { padding-bottom: 66px; }
  .header-inner, .hero, .page-content, .site-footer { width: min(calc(100% - 24px), var(--content)); }
  .hero { padding-top: 36px; gap: 30px; }
  .hero-visual img { aspect-ratio: 4/3; }
  .hero-lead { font-size: 15px; }
  .version-badge { display: block; line-height: 1.8; }
  .version-badge i { display: inline-block; margin: 0 6px; }
  .hero .cta-row { display: grid; grid-template-columns: 1fr; }
  .content-section { padding: 62px 0; }
  .section-heading h2 { font-size: 32px; }
  .card-grid { grid-template-columns: 1fr; }
  .card { min-height: 0; }
  .cta-panel { margin: 48px 0; padding: 28px 22px; }
  .cta-panel .cta-row { display: grid; }
  .wechat-layout { padding: 24px; grid-template-columns: 1fr; }
  .wechat-layout img { width: min(100%, 240px); margin: auto; }
  .download-card { padding: 24px; }
  .download-card dl div { grid-template-columns: 1fr; gap: 0; }
  .site-footer { padding-bottom: 30px; display: block; }
  .site-footer > div:last-child { margin-top: 28px; text-align: left; }
  .mobile-actions { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; height: 58px; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--bronze); background: #100d09; box-shadow: 0 -10px 35px rgba(0,0,0,.5); }
  .mobile-actions a { display: grid; place-items: center; color: var(--parchment-soft); text-decoration: none; font-size: 14px; }
  .mobile-actions a:first-child { background: var(--ember); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}