:root {
  --bg: #0a0c1a;
  --panel: #14162a;
  --line: rgba(255, 255, 255, 0.09);
  --text: #eceefa;
  --muted: #9ba2c4;
  --accent: #6ea8ff;
  --accent-2: #a77bff;
  --ok: #34c77a;
  --radius: 18px;
  --max: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { width: min(var(--max), 100% - 48px); margin: 0 auto; }

/* ── 顶栏 ─────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  background: rgba(10, 12, 26, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
.nav nav { display: flex; gap: 26px; font-size: 14px; }
.nav nav a { color: var(--muted); }
.nav nav a:hover { color: var(--text); text-decoration: none; }

/* ── 首屏 ─────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden;
  padding: 96px 0 72px; text-align: center;
}
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto;
  height: 620px; z-index: -1;
  background:
    radial-gradient(40% 50% at 25% 40%, rgba(40, 110, 220, 0.38), transparent 70%),
    radial-gradient(35% 45% at 78% 35%, rgba(130, 70, 230, 0.34), transparent 70%);
}
.hero .icon { width: 112px; height: 112px; border-radius: 25px; box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5); }
.hero h1 { margin-top: 26px; font-size: clamp(38px, 6vw, 64px); line-height: 1.15; letter-spacing: -0.01em; }
.hero .lead { margin: 16px auto 0; max-width: 560px; font-size: clamp(17px, 2vw, 20px); color: var(--muted); }

.cta { display: inline-flex; gap: 12px; margin-top: 34px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px; font-weight: 600; font-size: 15px;
}
.btn.primary { background: var(--text); color: #0a0c1a; }
.btn.ghost { border: 1px solid var(--line); color: var(--text); background: rgba(255, 255, 255, 0.04); }
.btn:hover { text-decoration: none; opacity: 0.88; }
.meta { margin-top: 14px; font-size: 13px; color: var(--muted); }

.video {
  margin: 56px auto 0; width: min(960px, 100%);
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
}
.video video { display: block; width: 100%; height: auto; }

/* ── 区块 ─────────────────────────────────────────── */
section { padding: 72px 0; }
.section-title { text-align: center; font-size: clamp(28px, 4vw, 40px); line-height: 1.25; }
.section-sub { text-align: center; color: var(--muted); margin-top: 10px; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 44px; }
.feature {
  padding: 26px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
}
.feature .emoji { font-size: 26px; }
.feature h3 { margin-top: 12px; font-size: 18px; }
.feature p { margin-top: 6px; color: var(--muted); font-size: 15px; }

.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 44px; }
.gallery img {
  display: block; width: 100%; height: auto;
  border-radius: 14px; border: 1px solid var(--line);
}
.gallery .wide { grid-column: 1 / -1; }

.styles { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 28px; }
.tag {
  padding: 7px 16px; border-radius: 999px; font-size: 14px;
  background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line);
}
.tag.pro::after { content: " · Pro"; color: var(--accent-2); }

.pricing { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin: 44px auto 0; max-width: 760px; }
.plan { padding: 30px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.plan.highlight { border-color: rgba(167, 123, 255, 0.55); box-shadow: 0 0 0 1px rgba(167, 123, 255, 0.25) inset; }
.plan h3 { font-size: 18px; }
.plan .price { font-size: 34px; font-weight: 700; margin: 6px 0 14px; }
.plan .price small { font-size: 15px; color: var(--muted); font-weight: 400; }
.plan ul { list-style: none; color: var(--muted); font-size: 15px; }
.plan li { padding: 4px 0 4px 22px; position: relative; }
.plan li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); }

.privacy-card {
  max-width: 760px; margin: 40px auto 0; padding: 30px 34px;
  border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line);
}
.privacy-card li { list-style: none; padding: 10px 0 10px 34px; position: relative; border-bottom: 1px solid var(--line); }
.privacy-card li:last-child { border-bottom: 0; }
.privacy-card li::before {
  content: "✓"; position: absolute; left: 0; top: 11px;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--ok); color: #fff; font-size: 13px; line-height: 22px; text-align: center;
}
.privacy-card b { display: block; }
.privacy-card span { color: var(--muted); font-size: 15px; }

/* ── 文档页（隐私政策 / 支持） ───────────────────────── */
.doc { padding: 64px 0 96px; }
.doc .wrap { max-width: 760px; }
.doc h1 { font-size: clamp(30px, 4vw, 40px); line-height: 1.25; }
.doc .updated { color: var(--muted); font-size: 14px; margin-top: 8px; }
.doc h2 { font-size: 21px; margin: 40px 0 10px; }
.doc p, .doc li { color: #cfd3ea; }
.doc p + p { margin-top: 12px; }
.doc ul { margin: 10px 0 0 22px; }
.doc li { margin: 6px 0; }
.doc .summary {
  margin-top: 28px; padding: 20px 24px; border-radius: 14px;
  background: rgba(52, 199, 122, 0.08); border: 1px solid rgba(52, 199, 122, 0.3);
}
.doc details { margin-top: 12px; padding: 16px 20px; border-radius: 12px; background: var(--panel); border: 1px solid var(--line); }
.doc summary { cursor: pointer; font-weight: 600; }
.doc details p { margin-top: 10px; }
.doc code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; background: rgba(255,255,255,0.07); padding: 1px 6px; border-radius: 5px; }

/* ── 页脚 ─────────────────────────────────────────── */
footer { border-top: 1px solid var(--line); padding: 34px 0 46px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer nav { display: flex; gap: 22px; }
footer a { color: var(--muted); }

@media (max-width: 760px) {
  .nav nav { gap: 16px; }
  .nav nav .hide-sm { display: none; }
  .hero { padding-top: 64px; }
  .features, .gallery, .pricing { grid-template-columns: 1fr; }
  section { padding: 56px 0; }
}

/* ── 下载区 ───────────────────────────────────────── */
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin: 44px auto 0; max-width: 820px; }
.dl-card { padding: 30px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.dl-card:first-child { border-color: rgba(110, 168, 255, 0.5); }
.dl-card h3 { font-size: 20px; }
.dl-card > p { color: var(--muted); font-size: 14px; margin: 4px 0 18px; }
.dl-card .btn[aria-disabled] { opacity: 0.55; cursor: default; }
.dl-card ul { list-style: none; margin-top: 18px; color: var(--muted); font-size: 15px; }
.dl-card li { padding: 4px 0 4px 22px; position: relative; }
.dl-card li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); }
.dl-card .dl-note { margin: 16px 0 0; font-size: 12.5px; line-height: 1.6; }
@media (max-width: 760px) { .dl-grid { grid-template-columns: 1fr; } }