:root {
  color-scheme: dark;
  --guide-bg: #050914;
  --guide-panel: rgba(12, 21, 37, 0.86);
  --guide-line: rgba(150, 176, 220, 0.16);
  --guide-text: #e7edf7;
  --guide-muted: #91a2b9;
  --guide-cyan: #4dd7ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--guide-text);
  background:
    radial-gradient(circle at 20% 0, rgba(77, 215, 255, 0.08), transparent 28rem),
    var(--guide-bg);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.guide-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 58px;
  padding: 0 max(20px, calc((100% - 1120px) / 2));
  border-bottom: 1px solid var(--guide-line);
  background: rgba(5, 9, 20, 0.92);
}

.guide-nav a {
  color: var(--guide-muted);
  font-size: 13px;
  text-decoration: none;
}

.guide-nav a:first-child {
  margin-right: auto;
  color: var(--guide-text);
  font-weight: 700;
}

.guide-nav a:hover {
  color: var(--guide-cyan);
}

.guide-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 58px 0 80px;
}

.guide-eyebrow {
  color: var(--guide-cyan);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.guide-hero h1,
.guide-article h1 {
  max-width: 900px;
  margin: 14px 0 18px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.guide-hero p,
.guide-lead {
  max-width: 820px;
  color: var(--guide-muted);
  font-size: 16px;
  line-height: 1.85;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.guide-card {
  padding: 24px;
  border: 1px solid var(--guide-line);
  border-radius: 16px;
  color: inherit;
  background: var(--guide-panel);
  text-decoration: none;
}

.guide-card:hover {
  border-color: rgba(77, 215, 255, 0.42);
}

.guide-card h2 {
  margin: 8px 0 10px;
  font-size: 21px;
}

.guide-card p,
.guide-card span {
  color: var(--guide-muted);
  font-size: 13px;
  line-height: 1.7;
}

.guide-article {
  max-width: 860px;
}

.guide-article h2 {
  margin: 42px 0 12px;
  font-size: 27px;
}

.guide-article h3 {
  margin: 28px 0 8px;
  font-size: 19px;
}

.guide-article p,
.guide-article li {
  color: #bdc9d9;
  font-size: 15px;
  line-height: 1.9;
}

.guide-article li {
  margin: 7px 0;
}

.guide-callout {
  margin: 30px 0;
  padding: 18px 20px;
  border: 1px solid rgba(77, 215, 255, 0.2);
  border-radius: 13px;
  background: rgba(77, 215, 255, 0.055);
}

.guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 42px;
}

.guide-actions a {
  padding: 11px 15px;
  border: 1px solid var(--guide-line);
  border-radius: 10px;
  color: var(--guide-text);
  background: var(--guide-panel);
  font-size: 13px;
  text-decoration: none;
}

@media (max-width: 720px),
  (max-width: 900px) and (max-height: 500px) and (orientation: landscape) {
  .guide-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    flex-wrap: wrap;
    gap: 8px 12px;
    padding: 12px;
    backdrop-filter: blur(16px);
  }

  .guide-nav a:first-child {
    width: 100%;
    margin: 0;
  }

  .guide-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 28px;
  }

  .guide-shell {
    width: calc(100% - 24px);
    padding: 36px 0 56px;
  }

  .guide-hero h1,
  .guide-article h1 {
    margin-top: 11px;
    font-size: clamp(32px, 10vw, 44px);
  }

  .guide-hero p,
  .guide-lead {
    font-size: 14px;
    line-height: 1.75;
  }

  .guide-card {
    padding: 19px;
    border-radius: 14px;
  }

  .guide-card h2 {
    font-size: 19px;
  }

  .guide-article h2 {
    margin-top: 34px;
    font-size: 23px;
  }

  .guide-article h3 {
    font-size: 17px;
  }

  .guide-article p,
  .guide-article li {
    font-size: 14px;
    line-height: 1.82;
  }

  .guide-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .guide-actions a {
    text-align: center;
  }
}