:root {
  --bg: #0b1120;
  --panel: rgba(17, 28, 45, 0.76);
  --line: rgba(255, 255, 255, 0.14);
  --text: #e6f0ff;
  --muted: #a7bddf;
  --accent: #88ddff;
  --accent2: #8de2b0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at 15% 10%, #1e2f53 0%, var(--bg) 42%);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.6;
}
.atlas-shell {
  max-width: 1040px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}
.site-header {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  background: rgba(9, 15, 27, 0.7);
}
.logo {
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #fff;
  text-decoration: none;
  font-size: 1.45rem;
}
.subtitle { margin: .4rem 0 1rem; color: var(--muted); }
.top-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.top-nav a {
  color: #c7e3ff;
  text-decoration: none;
}
.top-nav a.active, .top-nav a:hover { color: #fff; text-decoration: underline; }
main {
  margin-top: 1.2rem;
}
.hero {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 1.25rem;
  align-items: center;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(120deg, #122240 0%, rgba(10, 24, 46, 0.92) 100%);
}
.hero-media img { width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); }
h1, h2, h3 { margin: 0 0 .7rem; line-height: 1.3; }
.cta {
  display: inline-block;
  margin-top: 1rem;
  background: linear-gradient(90deg, var(--accent), #6de7ff);
  color: #071221;
  padding: .7rem 1rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}
.atlas-card, article, .faq-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin: 1rem 0;
}
.atlas-grid {
  display: grid;
  gap: .8rem;
  grid-template-columns: repeat(3, minmax(0,1fr));
}
.atlas-grid article {
  margin: 0;
}
.image-note img { width: 100%; max-width: 640px; border-radius: 10px; border:1px solid var(--line); }
.ad-slot {
  margin: 1rem 0;
  border: 1px dashed #7ab2ff;
  border-radius: 10px;
  padding: 0.8rem;
  color: #c7ddf6;
  background: rgba(122, 168, 255, 0.07);
}
.back-link { color: var(--accent2); }
footer { color: var(--muted); margin-top: 1.2rem; font-size: .9rem; }
@media (max-width: 800px) {
  .hero { grid-template-columns: 1fr; }
  .atlas-grid { grid-template-columns: 1fr; }
}