:root {
  --bg: #0b1020;
  --panel: #121934;
  --muted: #e8edff;
  --text: #f7f9ff;
  --sub: #b4bfdf;
  --primary: #4f7cff;
  --primary-dark: #3d65db;
  --line: #283257;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
.container { width: min(1120px, 92%); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 16, 32, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 64px;
}

.brand { font-size: 1.2rem; font-weight: 700; letter-spacing: 0.4px; }
.main-nav { display: flex; gap: 18px; }
.main-nav a { color: var(--sub); }
.main-nav a:hover,
.main-nav a[aria-current="page"] { color: #fff; }

.hero { padding: 72px 0 40px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: start;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 10px;
  border-radius: 999px;
  color: #d9e2ff;
  border: 1px solid var(--line);
}

h1 { margin: 0 0 14px; line-height: 1.2; font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
h2 { margin: 0 0 12px; line-height: 1.3; font-size: clamp(1.35rem, 2.8vw, 1.85rem); }
h3 { margin: 0 0 10px; font-size: 1.06rem; }
.lead { color: var(--sub); margin: 0 0 18px; }

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { border-color: var(--line); color: #d8e2ff; }

.stat-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.stat-list li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}
.stat-list strong { display: block; font-size: 1.05rem; }
.stat-list span { color: var(--sub); font-size: 0.95rem; }

.hero-card,
.dl-card,
.feature-grid article,
.faq details {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.hero-card { padding: 18px; }
.hero-card p, .hero-card li { color: var(--sub); }
.inline-link { color: #9fbdff; text-decoration: underline; }

.section { padding: 36px 0; }
.muted { background: var(--muted); color: #111934; }
.muted h2, .muted h3 { color: #0b1431; }
.muted .faq details { background: #fff; border-color: #d5def8; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.feature-grid article { padding: 16px; }
.feature-grid p { color: var(--sub); margin: 0; }

.faq { display: grid; gap: 10px; }
.faq details { padding: 12px 14px; }
.faq summary { cursor: pointer; font-weight: 600; }

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 24px 0 12px;
}
.dl-card { padding: 16px; }
.dl-card p { color: var(--sub); min-height: 46px; }
.plain-list { margin: 0; padding-left: 20px; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 16px 0;
  color: var(--sub);
}
.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .hero-grid,
  .feature-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }
  .stat-list { grid-template-columns: 1fr; }
}