:root {
  --stone: #efe6d6;
  --stone-hi: #f8f2e7;
  --stone-lo: #e2d4bc;
  --stone-deep: #d6c4a6;
  --ink: #3f3122;
  --ink-soft: #6e5c46;
  --muted: #8a765c;
  --bronze: #9a6a36;
  --bronze-hi: #c38d4f;
  --light: rgba(255, 252, 244, 0.85);
  --shade: rgba(92, 66, 34, 0.26);
  --shade-deep: rgba(70, 48, 22, 0.38);
  --raise: -6px -6px 14px var(--light), 8px 10px 24px var(--shade), inset 1px 1px 0 rgba(255,255,255,.7), inset -1px -1px 0 rgba(92,66,34,.14);
  --raise-sm: -3px -3px 8px var(--light), 4px 5px 12px var(--shade), inset 1px 1px 0 rgba(255,255,255,.7), inset -1px -1px 0 rgba(92,66,34,.12);
  --recess: inset 5px 5px 12px var(--shade), inset -5px -5px 12px var(--light);
  --radius: 18px;
  --wrap: 1180px;
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", "Source Han Serif SC", serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  color: var(--ink);
  background-color: var(--stone);
  background-image:
    radial-gradient(ellipse at 15% 0%, rgba(255,250,238,.9), transparent 55%),
    radial-gradient(ellipse at 100% 60%, rgba(214,196,166,.35), transparent 50%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .45 0 0 0 0 .35 0 0 0 0 .2 0 0 0 .07 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  font: 16px/1.75 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; line-height: 1.25; font-family: var(--serif); font-weight: 700; }
p { margin: 0; }
code { font-family: Consolas, "Cascadia Mono", monospace; font-size: .9em; padding: 2px 7px; border-radius: 6px; background: var(--stone-lo); box-shadow: inset 1px 1px 3px var(--shade); }
:focus-visible { outline: 2px solid var(--bronze); outline-offset: 3px; border-radius: 6px; }

.wrap { width: min(var(--wrap), 100% - 48px); margin-inline: auto; }
.skip { position: absolute; left: 16px; top: -48px; background: var(--bronze); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { top: 12px; }

/* 阴刻文字：上方受光、下方压暗，像刻进石面 */
.carve {
  color: #5a4630;
  text-shadow: 0 1px 0 rgba(255,253,246,.9), 0 -1px 0 rgba(70,48,22,.35), 0 2px 3px rgba(255,253,246,.5);
  letter-spacing: .02em;
}
/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(239, 230, 214, 0.78);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  transition: box-shadow .25s ease;
}
.topbar.scrolled { box-shadow: 0 1px 0 rgba(255,255,255,.7), 0 8px 24px rgba(92,66,34,.14); }
.topbar-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font: 700 20px/1 var(--serif); color: var(--ink); letter-spacing: .04em; }
.brand-seal {
  display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo));
  box-shadow: var(--raise-sm);
}
.brand-seal-lg { width: 96px; height: 96px; border-radius: 26px; margin: 0 auto 22px; box-shadow: var(--raise); }
.nav { display: flex; gap: 6px; margin-left: auto; }
.nav a { padding: 8px 14px; border-radius: 10px; color: var(--ink-soft); font-size: 15px; transition: box-shadow .2s, color .2s; }
.nav a:hover { color: var(--ink); box-shadow: var(--recess); }

/* 按钮：铜色浮起的牌子 */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 22px; border-radius: 14px; border: 0; cursor: pointer;
  font: 600 15px/1 inherit; color: #fff8ec; letter-spacing: .03em;
  background: linear-gradient(160deg, var(--bronze-hi) 0%, var(--bronze) 55%, #7d5228 100%);
  box-shadow: -3px -3px 8px var(--light), 5px 7px 16px rgba(92,58,22,.38), inset 1px 1px 0 rgba(255,230,190,.55), inset -1px -2px 0 rgba(60,36,12,.35);
  text-shadow: 0 -1px 0 rgba(60,36,12,.45);
  transition: transform .18s ease, box-shadow .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(1px); box-shadow: inset 3px 3px 8px rgba(60,36,12,.45), inset -2px -2px 6px rgba(255,220,170,.3); }
.btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-lg { padding: 16px 28px; font-size: 16px; border-radius: 16px; }
.btn-ghost {
  color: var(--ink); text-shadow: 0 1px 0 rgba(255,255,255,.8);
  background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo));
  box-shadow: var(--raise-sm);
}
.btn-ghost:active { box-shadow: var(--recess); }

/* 首屏：浮雕背景 + 标题 + 视频 */
.hero { position: relative; padding: 96px 0 72px; overflow: hidden; isolation: isolate; }
.hero-bg {
  position: absolute; inset: 0 0 auto; height: 780px; z-index: -1;
  -webkit-mask-image: linear-gradient(to bottom, #000 45%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 45%, transparent 100%);
}
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: center 35%; opacity: .9; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 60% 55% at 50% 38%, rgba(244,236,222,.94) 0%, rgba(244,236,222,.7) 45%, rgba(244,236,222,0) 75%);
}
.hero-copy { text-align: center; max-width: 820px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; font-size: 13px; color: var(--bronze); letter-spacing: .08em;
  background: rgba(248,242,231,.7); box-shadow: var(--recess);
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--bronze-hi); box-shadow: 0 0 0 3px rgba(195,141,79,.22); }
.hero h1 { margin-top: 22px; font-size: clamp(40px, 6.4vw, 76px); letter-spacing: .08em; }
.hero h1 .sep { margin: 0 .25em; color: var(--bronze-hi); }
.lede { margin: 22px auto 0; max-width: 640px; font-size: 18px; color: var(--ink-soft); }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; margin-top: 34px; }
.meta { margin-top: 18px; font-size: 13px; color: var(--muted); }
/* 石框：外圈凸起、内圈凹陷，内容像嵌进石面 */
.frame {
  padding: 16px; border-radius: 28px;
  background: linear-gradient(145deg, var(--stone-hi) 0%, var(--stone) 50%, var(--stone-lo) 100%);
  box-shadow: -10px -10px 24px var(--light), 14px 18px 40px var(--shade-deep), inset 2px 2px 0 rgba(255,255,255,.75), inset -2px -2px 0 rgba(92,66,34,.16);
}
.frame-inner {
  position: relative; overflow: hidden; border-radius: 16px; background: #1d1710;
  box-shadow: inset 4px 4px 10px rgba(40,26,10,.6), inset -2px -2px 6px rgba(255,250,240,.25);
  padding: 4px;
}
.frame-inner > img, .frame-inner > video { width: 100%; border-radius: 12px; }

.demo { margin-top: 64px; max-width: 1040px; }
.demo video { aspect-ratio: 944 / 544; background: #1d1710; }
.demo figcaption { margin-top: 18px; text-align: center; font-size: 14px; color: var(--muted); }
.play {
  position: absolute; left: 50%; top: 50%; translate: -50% -50%;
  width: 92px; height: 92px; border-radius: 50%; border: 0; cursor: pointer; display: grid; place-items: center;
  background: linear-gradient(145deg, var(--stone-hi), var(--stone-deep));
  box-shadow: 0 0 0 10px rgba(248,242,231,.28), 0 14px 34px rgba(20,12,4,.55), inset 2px 2px 0 rgba(255,255,255,.8), inset -2px -3px 0 rgba(92,66,34,.3);
  transition: transform .2s ease;
}
.play:hover { transform: scale(1.06); }
.play svg { width: 36px; height: 36px; margin-left: 5px; fill: var(--bronze); filter: drop-shadow(0 1px 0 rgba(255,255,255,.8)); }
.play[hidden] { display: none; }

.stats { list-style: none; padding: 0; margin-top: 64px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stats li {
  padding: 22px 16px; text-align: center; border-radius: var(--radius);
  background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo)); box-shadow: var(--raise);
}
.stats strong { display: block; font: 700 24px/1.3 var(--serif); color: var(--bronze); text-shadow: 0 1px 0 rgba(255,255,255,.85); }
.stats span { font-size: 14px; color: var(--ink-soft); }

/* 区块 */
.section { padding: 104px 0; position: relative; }
.section-recess {
  margin: 0 clamp(0px, 2vw, 32px); border-radius: 40px;
  background: linear-gradient(180deg, var(--stone-lo), #e8dcc7);
  box-shadow: inset 10px 10px 30px var(--shade), inset -10px -10px 30px var(--light);
}
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.sec-head h2 { margin-top: 18px; font-size: clamp(30px, 4vw, 44px); letter-spacing: .06em; }
.sec-sub { margin-top: 14px; color: var(--ink-soft); font-size: 17px; }

/* 三块大浮雕面板 */
.showcase { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.panel {
  border-radius: 26px; overflow: hidden;
  background: linear-gradient(160deg, var(--stone-hi), var(--stone-lo)); box-shadow: var(--raise);
  transition: transform .3s ease, box-shadow .3s ease;
}
.panel:hover { transform: translateY(-4px); box-shadow: -8px -8px 18px var(--light), 12px 16px 34px var(--shade-deep), inset 1px 1px 0 rgba(255,255,255,.7); }
.panel-art { margin: 12px 12px 0; border-radius: 18px; overflow: hidden; box-shadow: inset 0 0 0 1px rgba(92,66,34,.12), 0 2px 0 rgba(255,255,255,.7); }
.panel-art img { width: 100%; aspect-ratio: 1; object-fit: cover; transition: transform .6s ease; }
.panel:hover .panel-art img { transform: scale(1.04); }
.panel-copy { padding: 22px 26px 28px; }
.panel h3, .tile h3 { font-size: 21px; color: var(--ink); text-shadow: 0 1px 0 rgba(255,255,255,.8); }
.panel p, .tile p { margin-top: 10px; color: var(--ink-soft); font-size: 15px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 28px; }
.tile { padding: 28px 26px; border-radius: 22px; background: var(--stone); box-shadow: var(--recess); }
.icon {
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 16px; margin-bottom: 18px;
  background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo)); box-shadow: var(--raise-sm);
}
.icon svg { width: 26px; height: 26px; fill: none; stroke: var(--bronze); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
/* 流程：浮雕横幅 + 八格刻石 */
.frieze { border-radius: 22px; overflow: hidden; margin-bottom: 36px; box-shadow: var(--raise); }
.frieze img { width: 100%; }
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(8, 1fr); gap: 14px; }
.steps li {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 4px;
  padding: 20px 8px; border-radius: 18px;
  background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo)); box-shadow: var(--raise-sm);
}
.steps b { font: 700 13px/1 var(--serif); color: var(--bronze-hi); letter-spacing: .1em; }
.steps strong { font: 700 20px/1.4 var(--serif); color: var(--ink); text-shadow: 0 1px 0 rgba(255,255,255,.85); }
.steps span { font-size: 13px; color: var(--muted); line-height: 1.5; }

/* 界面截图 */
.tabs { display: flex; justify-content: center; gap: 8px; width: max-content; max-width: 100%; margin: 0 auto 32px; padding: 7px; border-radius: 18px; background: var(--stone); box-shadow: var(--recess); }
.tabs button {
  padding: 10px 22px; border: 0; border-radius: 12px; cursor: pointer; background: transparent;
  font: 600 15px/1 inherit; color: var(--ink-soft); transition: box-shadow .2s, color .2s, background .2s;
}
.tabs button[aria-selected="true"] { color: var(--bronze); background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo)); box-shadow: var(--raise-sm); }
.frame-lg { max-width: 1000px; margin-inline: auto; }
.frame-lg .frame-inner { background: #fff; }
#shot-img { transition: opacity .25s ease; }
#shot-img.fading { opacity: .25; }

/* 下载：浮雕舞台上一块凸起的匾 */
.download { overflow: hidden; isolation: isolate; }
.download-bg { position: absolute; inset: 0; z-index: -1; }
.download-bg img { width: 100%; height: 100%; object-fit: cover; }
.download-bg::after { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(239,230,214,.35), rgba(239,230,214,.8) 80%); }
.plaque {
  max-width: 680px; margin: 0 auto; padding: 52px 44px; text-align: center; border-radius: 32px;
  background: linear-gradient(150deg, rgba(250,245,235,.94), rgba(230,218,196,.94));
  box-shadow: -12px -12px 28px rgba(255,252,244,.7), 18px 22px 48px var(--shade-deep), inset 2px 2px 0 rgba(255,255,255,.8), inset -2px -2px 0 rgba(92,66,34,.18);
  backdrop-filter: blur(4px);
}
.plaque h2 { font-size: clamp(28px, 3.6vw, 38px); letter-spacing: .05em; }
.plaque .btn { margin-top: 30px; }
.specs { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin: 30px 0 0; }
.specs div { padding: 10px 18px; border-radius: 12px; background: var(--stone); box-shadow: var(--recess); font-size: 14px; }
.specs dt { display: inline; color: var(--muted); margin-right: 8px; }
.specs dd { display: inline; margin: 0; color: var(--ink); }
.note { margin-top: 22px; font-size: 13px; color: var(--muted); }

/* FAQ */
.faq-wrap { max-width: 820px; }
.faq { display: grid; gap: 16px; }
.faq details { border-radius: 18px; background: linear-gradient(145deg, var(--stone-hi), var(--stone-lo)); box-shadow: var(--raise-sm); transition: box-shadow .2s; }
.faq details[open] { background: var(--stone); box-shadow: var(--recess); }
.faq summary { list-style: none; cursor: pointer; padding: 20px 56px 20px 24px; position: relative; font: 700 17px/1.5 var(--serif); color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 22px; top: 50%; translate: 0 -50%; font: 400 24px/1 sans-serif; color: var(--bronze); transition: rotate .2s; }
.faq details[open] summary::after { rotate: 45deg; }
.faq details p { padding: 0 24px 22px; color: var(--ink-soft); }

.footer { padding: 40px 0 48px; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 28px; border-top: 1px solid rgba(92,66,34,.16); box-shadow: inset 0 1px 0 rgba(255,255,255,.7); }
.footer p { font-size: 13px; color: var(--muted); }

/* 入场动效 */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .panel, .panel-art img, .btn, .play { transition: none; }
}

@media (max-width: 1024px) {
  .steps { grid-template-columns: repeat(4, 1fr); }
  .showcase, .features { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .nav { display: none; }
  .topbar-inner { justify-content: space-between; }
  .hero { padding: 64px 0 56px; }
  .hero-bg { height: 620px; }
  .hero h1 { letter-spacing: .04em; }
  .hero h1 .sep { display: block; height: 0; overflow: hidden; }
  .lede { font-size: 16px; }
  .demo { margin-top: 44px; }
  .frame { padding: 10px; border-radius: 20px; }
  .play { width: 68px; height: 68px; }
  .play svg { width: 28px; height: 28px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 14px; }
  .section { padding: 72px 0; }
  .section-recess { margin: 0; border-radius: 28px; }
  .showcase, .features { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .plaque { padding: 40px 22px; }
  .footer-inner { flex-direction: column; text-align: center; }
}