:root {
  --bg: #0f1013;
  --bg-2: #16171b;
  --card: #1d1e23;
  --line: rgba(255, 255, 255, .08);
  --ink: #f3eee4;
  --muted: #a39c90;
  --dim: #6f6a62;
  --gold: #e6b566;
  --gold-soft: rgba(230, 181, 102, .14);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --radius: 18px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.75 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; letter-spacing: .02em; margin: 0; }

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(15, 16, 19, .82);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand img { border-radius: 8px; }
.brand span { font-family: var(--serif); font-weight: 700; font-size: 20px; letter-spacing: .14em; color: var(--gold); }
.brand small { color: var(--muted); letter-spacing: .3em; font-size: 12px; }
.nav nav { display: flex; gap: 30px; font-size: 15px; color: var(--muted); }
.nav nav a:hover { color: var(--ink); }

/* 首屏 */
.hero {
  position: relative;
  display: grid; grid-template-columns: 1fr 1.25fr; align-items: center; gap: 32px;
  max-width: var(--max); margin: 0 auto; padding: 72px 24px 40px;
}
.hero::before {
  content: ""; position: absolute; z-index: -1; inset: -120px -20% auto -30%; height: 720px;
  background: radial-gradient(closest-side, rgba(150, 105, 45, .32), transparent 70%);
}
.eyebrow { color: var(--gold); letter-spacing: .3em; font-size: 14px; margin: 0 0 18px; }
.hero h1 { font-size: clamp(40px, 5.4vw, 66px); line-height: 1.2; }
.lead { color: var(--muted); font-size: 18px; margin: 26px 0 34px; max-width: 30em; }
.actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; height: 48px; padding: 0 28px; border-radius: 24px;
  font-size: 16px; transition: transform .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: var(--gold); color: #1b160e; font-weight: 600; }
.btn.ghost { border: 1px solid rgba(230, 181, 102, .45); color: var(--gold); }
.hero-tv { width: 100%; filter: drop-shadow(0 40px 60px rgba(0, 0, 0, .45)); }

/* 数据条 */
.numbers {
  display: grid; grid-template-columns: repeat(4, 1fr);
  max-width: var(--max); margin: 10px auto 0; padding: 26px 24px;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.numbers div { text-align: center; }
.numbers strong { display: block; font-family: var(--serif); font-size: 34px; color: var(--gold); }
.numbers span { color: var(--muted); font-size: 14px; }

/* 通用区块 */
.section { max-width: var(--max); margin: 0 auto; padding: 110px 24px 0; }
.section > h2 { font-size: clamp(28px, 3.2vw, 40px); text-align: center; }
.sub { color: var(--muted); text-align: center; margin: 14px 0 0; }

/* 功能 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 56px; }
.features article {
  background: linear-gradient(160deg, var(--card), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 28px;
}
.features i {
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%;
  border: 1.5px solid var(--gold); color: var(--gold); background: var(--gold-soft);
  font: 700 22px var(--serif); font-style: normal;
}
.features h3 { font-size: 21px; margin: 20px 0 10px; }
.features p { color: var(--muted); margin: 0; font-size: 15px; }

/* 界面 */
.tabs { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin: 36px 0 34px; }
.tabs button {
  font: inherit; font-size: 15px; color: var(--muted); background: transparent; cursor: pointer;
  border: 1px solid var(--line); border-radius: 20px; padding: 7px 20px; transition: all .2s;
}
.tabs button:hover { color: var(--ink); }
.tabs button.active { background: var(--gold); border-color: var(--gold); color: #1b160e; }
.tv-frame {
  margin: 0 auto; max-width: 1000px; padding: 12px; border-radius: 22px;
  background: #18181a; border: 1px solid #3a3834;
  box-shadow: 0 50px 90px -30px rgba(0, 0, 0, .7), 0 0 120px -40px rgba(230, 181, 102, .35);
}
.tv-frame img { border-radius: 10px; width: 100%; transition: opacity .25s; }
.tv-frame.small { max-width: 560px; }
.caption { text-align: center; color: var(--muted); margin-top: 26px; min-height: 2em; }

/* 安装 */
.install { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 56px; }
.install article {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px;
}
.install article:first-child { grid-column: 1 / -1; }
.install h3 { font-size: 24px; margin: 14px 0 10px; }
.install p, .install li { color: var(--muted); font-size: 15px; }
.install ul { padding-left: 1.2em; margin: 12px 0 18px; }
.install b { color: var(--ink); }
.install img { margin-top: 10px; }
.tag { display: inline-block; font-size: 13px; color: var(--gold); background: var(--gold-soft); padding: 2px 12px; border-radius: 12px; }
pre {
  margin: 0; padding: 16px 18px; border-radius: 12px; overflow-x: auto;
  background: #101114; border: 1px solid var(--line); font-size: 13px; line-height: 1.7; color: #d9cfbd;
}
.brands { margin-top: 44px; }
.brands h3 { font-size: 22px; text-align: center; margin-bottom: 20px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; background: var(--card); border-radius: var(--radius); overflow: hidden; }
th, td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; background: var(--bg-2); }
tr:last-child td { border-bottom: 0; }
td.yes { color: #8fcf9c; }
td.part { color: var(--gold); }
td.no { color: #e08b73; }
.note { color: var(--dim); font-size: 13px; text-align: center; margin-top: 14px; }

/* 管理 */
.manage { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 56px; }
.manage h2 { font-size: clamp(28px, 3.2vw, 40px); }
.manage .sub { text-align: left; }
.checks { list-style: none; padding: 0; margin: 30px 0 0; display: grid; gap: 16px; }
.checks li { color: var(--muted); padding-left: 30px; position: relative; font-size: 15px; }
.checks li::before { content: ""; position: absolute; left: 0; top: .55em; width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--gold); }
.checks b { display: block; color: var(--ink); font-size: 17px; }

/* 常见问题 */
.faq { max-width: 820px; }
.faq h2 { margin-bottom: 40px; }
details { border-bottom: 1px solid var(--line); padding: 20px 4px; }
summary { cursor: pointer; font-size: 18px; list-style: none; display: flex; justify-content: space-between; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--gold); font-size: 22px; line-height: 1; }
details[open] summary::after { content: "−"; }
details p { color: var(--muted); margin: 12px 0 0; }

/* 页脚 */
.footer {
  max-width: var(--max); margin: 120px auto 0; padding: 36px 24px 48px;
  display: flex; justify-content: space-between; align-items: flex-end; gap: 20px;
  border-top: 1px solid var(--line); color: var(--dim); font-size: 13px;
}
.footer p { margin: 10px 0 0; }
.footer .brand span { font-size: 17px; }
.legal { display: flex; gap: 18px; }
.legal a:hover { color: var(--muted); }

@media (max-width: 900px) {
  .nav nav { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 48px; text-align: center; }
  .lead { margin-left: auto; margin-right: auto; }
  .actions { justify-content: center; }
  .numbers { grid-template-columns: repeat(2, 1fr); row-gap: 20px; }
  .features, .install, .manage { grid-template-columns: 1fr; }
  .manage .sub { text-align: center; }
  .manage h2 { text-align: center; }
  .section { padding-top: 80px; }
  .footer { flex-direction: column; align-items: center; text-align: center; }
  th, td { padding: 12px; font-size: 14px; }
}