:root {
  --bg-1: #060b1d;
  --bg-2: #101b3a;
  --bg-3: #17294c;
  --panel: rgba(17, 31, 59, 0.84);
  --line: rgba(160, 200, 255, 0.25);
  --text: #e8f4ff;
  --muted: #a9bfd7;
  --accent: #9ee3ff;
  --accent-soft: #1b4f7c;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(130% 120% at 75% 10%, var(--bg-3) 0%, var(--bg-2) 48%, var(--bg-1) 100%);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.75;
}
body {
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 22px 52px;
}
.hero {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px;
  background: linear-gradient(130deg, rgba(13, 30, 62, 0.9), rgba(7, 17, 42, 0.65));
  box-shadow: 0 16px 36px rgba(0,0,0,.45);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(158, 227, 255, 0.14), transparent 40%, transparent 60%, rgba(158, 227, 255, 0.05));
}
.hero-content { position: relative; z-index: 1; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}
.brand img { width: 180px; height: auto; }
.nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.nav a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
}
h1, h2, h3 {
  margin: 0 0 14px;
  letter-spacing: 0.03em;
}
h1 { font-size: clamp(2rem, 4vw, 2.6rem); line-height: 1.25; }
h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); }
section {
  margin-top: 22px;
  border-left: 2px solid var(--accent-soft);
  padding-left: 16px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }
.badge {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  color: #d4f1ff;
  background: rgba(30, 86, 140, 0.42);
  padding: 4px 10px;
  border-radius: 999px;
}
.slot-strip {
  margin-top: 18px;
  border: 1px dashed rgba(158, 227, 255, 0.55);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  color: #c9e4fb;
}
.faq details {
  margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 700; }
.footer {
  margin-top: 30px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding-top: 14px;
  font-size: 14px;
}
@media (max-width: 840px) {
  .grid { grid-template-columns: 1fr; }
  .span-4,.span-6,.span-8,.span-12 { grid-column: auto; }
  .topbar { flex-direction: column; align-items: flex-start; }
  .brand img { width: 170px; }
}