/* demoforge.video — 单份样式表，所有页面共用。
   目标：暗色、克制、像产品本身；首屏不加载任何框架。 */

:root {
  --bg: #080b10;
  --panel: #0d1219;
  --panel-2: #111823;
  --line: #1c2532;
  --text: #e8eef7;
  --dim: #9aa9bd;
  --muted: #6b7a8f;
  --accent: #4f8cff;
  --accent-2: #7ab0ff;
  --ok: #3fb950;
  --radius: 12px;
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶栏 ---------- */
header.site {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(8, 11, 16, 0.82);
  border-bottom: 1px solid var(--line);
}
header.site .bar {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  height: 58px; display: flex; align-items: center; gap: 26px;
}
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; letter-spacing: -0.2px; color: var(--text); }
.logo:hover { text-decoration: none; }
.logo .dot {
  width: 20px; height: 20px; border-radius: 6px;
  background: linear-gradient(140deg, var(--accent), #2f6be0);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}
nav.main { display: flex; gap: 20px; font-size: 13.5px; }
nav.main a { color: var(--dim); }
nav.main a:hover { color: var(--text); text-decoration: none; }
nav.main a.on { color: var(--text); }
.spacer { flex: 1; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 9px; font-weight: 600; font-size: 14px;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: #63a0ff; }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--text); }
.btn.ghost:hover { background: var(--panel-2); }
.btn.small { padding: 8px 14px; font-size: 13px; }

/* ---------- Hero ---------- */
.hero { padding: 76px 0 40px; text-align: center; }
.hero h1 {
  margin: 0 0 18px; font-size: clamp(30px, 4.6vw, 50px); line-height: 1.14;
  letter-spacing: -1.1px; font-weight: 760;
}
.hero h1 em { font-style: normal; color: var(--accent-2); }
.hero p.lead {
  margin: 0 auto 30px; max-width: 640px; color: var(--dim); font-size: 16.5px;
}
.hero .ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .note { margin-top: 16px; font-size: 12.5px; color: var(--muted); }

/* 演示视频 */
.demo {
  margin: 44px auto 0; max-width: 940px; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--panel);
  overflow: hidden; box-shadow: 0 40px 100px rgba(0, 0, 0, 0.55);
}
.demo video, .demo .placeholder {
  display: block; width: 100%; aspect-ratio: 16 / 9; background: #0b1018;
}
.demo .placeholder {
  display: grid; place-items: center; color: var(--muted); font-size: 13px;
}

/* ---------- 区块 ---------- */
section { padding: 68px 0; }
section.alt { background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2.sec { margin: 0 0 10px; font-size: 27px; letter-spacing: -0.6px; font-weight: 700; }
p.sub { margin: 0 0 36px; color: var(--dim); max-width: 620px; }

/* 能力网格 */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  padding: 22px; border-radius: var(--radius); background: var(--panel);
  border: 1px solid var(--line);
}
.card h3 { margin: 0 0 8px; font-size: 15.5px; }
.card p { margin: 0; color: var(--dim); font-size: 13.5px; }
.card .ico { font-size: 18px; margin-bottom: 10px; display: block; }

/* 对照表 */
table.cmp { width: 100%; border-collapse: collapse; font-size: 14px; }
table.cmp th, table.cmp td { padding: 13px 14px; text-align: left; border-bottom: 1px solid var(--line); }
table.cmp th { color: var(--muted); font-weight: 500; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.4px; }
table.cmp td.yes { color: var(--ok); }
table.cmp td.no { color: var(--muted); }
table.cmp tr:last-child td { border-bottom: 0; }

/* 价格 */
.tiers { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; max-width: 780px; }
.tier { padding: 26px; border-radius: 14px; border: 1px solid var(--line); background: var(--panel); }
.tier.feature { border-color: #2b4a80; background: linear-gradient(180deg, #101a2a, var(--panel)); }
.tier .name { font-size: 13px; color: var(--dim); text-transform: uppercase; letter-spacing: 0.6px; }
.tier .price { font-size: 38px; font-weight: 760; letter-spacing: -1.4px; margin: 8px 0 4px; }
.tier .price small { font-size: 13px; font-weight: 500; color: var(--muted); letter-spacing: 0; }
.tier ul { margin: 16px 0 22px; padding: 0; list-style: none; font-size: 13.5px; color: var(--dim); }
.tier li { padding: 5px 0 5px 22px; position: relative; }
.tier li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); }

/* FAQ */
.faq { max-width: 760px; }
.faq details {
  border-bottom: 1px solid var(--line); padding: 16px 0;
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 14.5px; }
.faq p { color: var(--dim); font-size: 13.5px; margin: 10px 0 0; }

/* 页面通用头部 */
.page-head { padding: 60px 0 20px; }
.page-head h1 { margin: 0 0 10px; font-size: 36px; letter-spacing: -1px; }
.page-head p { color: var(--dim); margin: 0; }

/* 下载块 */
.dl-block {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 22px; border-radius: var(--radius); border: 1px solid var(--line);
  background: var(--panel); margin-bottom: 14px;
}
.dl-block .meta { flex: 1; min-width: 240px; }
.dl-block .meta b { display: block; font-size: 15px; }
.dl-block .meta span { color: var(--muted); font-size: 12.5px; }
code.hash { font-size: 11.5px; color: var(--muted); word-break: break-all; }

/* 法务正文 */
.prose { max-width: 720px; padding-bottom: 60px; }
.prose h2 { font-size: 18px; margin: 30px 0 8px; }
.prose p, .prose li { color: var(--dim); font-size: 14px; }
.prose ul { padding-left: 20px; }

/* 页脚 */
footer.site {
  border-top: 1px solid var(--line); padding: 34px 0 46px;
  color: var(--muted); font-size: 12.5px;
}
footer.site .cols { display: flex; gap: 48px; flex-wrap: wrap; margin-bottom: 22px; }
footer.site .col b { display: block; color: var(--dim); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 10px; }
footer.site .col a { display: block; color: var(--muted); padding: 3px 0; }
footer.site .col a:hover { color: var(--text); text-decoration: none; }

/* 响应式 */
@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .tiers { grid-template-columns: 1fr; }
  nav.main { display: none; }
  .hero { padding: 48px 0 28px; }
  section { padding: 48px 0; }
}