/* 第5套：问答驱动 · 深色双栏 · 薄荷按钮 · 左侧目录 · 等宽标签 */
:root {
  --bg: #0f1115;
  --panel: #181b22;
  --ink: #e8eaed;
  --dim: #9aa3ad;
  --mint: #3ecf8e;
  --mint-ink: #062114;
  --line: #2a303a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

.dock {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--line);
  background: #0b0d11;
}
.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.16em;
  font-size: 18px;
}
.dock nav a {
  color: var(--dim);
  text-decoration: none;
  margin-left: 18px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.dock nav a.live { color: var(--mint); }

.layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  max-width: 1180px;
  margin: 0 auto;
}
.toc {
  padding: 28px 16px 48px 24px;
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
}
.toc p {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 11px;
  color: var(--mint);
  letter-spacing: 0.12em;
  margin: 0 0 12px;
}
.toc a {
  display: block;
  color: var(--dim);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 0;
}
.toc a:hover { color: var(--ink); }

.pane { padding: 28px 32px 80px; }
.hero-q {
  background: var(--panel);
  padding: 28px 28px 24px;
  border-left: 3px solid var(--mint);
  margin-bottom: 28px;
}
.hero-q h1 { margin: 0 0 12px; font-size: 26px; line-height: 1.35; }
.mint-btn {
  display: inline-block;
  background: var(--mint);
  color: var(--mint-ink);
  text-decoration: none;
  padding: 11px 16px;
  font-weight: 700;
}
.ghost-btn {
  display: inline-block;
  margin-left: 8px;
  padding: 10px 14px;
  color: var(--mint);
  border: 1px solid var(--mint);
  text-decoration: none;
}

.qa-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.qa-item h2 {
  margin: 0 0 10px;
  font-size: 19px;
  color: var(--mint);
}
.qa-item p { color: var(--ink); margin: 0 0 10px; }
.tag {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.08em;
}

dl.faq dt { margin-top: 16px; font-weight: 700; color: var(--ink); }
dl.faq dd { margin: 6px 0 0; color: var(--dim); }

.footline {
  padding: 24px 32px 40px;
  color: var(--dim);
  font-size: 13px;
  border-top: 1px solid var(--line);
}
.footline a { color: var(--mint); margin-right: 12px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .toc { position: relative; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .dock { flex-direction: column; align-items: flex-start; gap: 8px; }
  .dock nav a { margin-left: 0; margin-right: 12px; }
  .ghost-btn { margin-left: 0; margin-top: 8px; }
}