/* Set 2 — dark two-column workspace, teal accent */
:root {
  --bg: #101318;
  --rail: #161b22;
  --panel: #1c232d;
  --text: #e7edf4;
  --dim: #93a0b3;
  --line: #2a3442;
  --teal: #2ec4b6;
  --teal-dim: #1a8f85;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
}
.shell {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}
.rail {
  background: var(--rail);
  border-right: 1px solid var(--line);
  padding: 28px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
}
.brand {
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  display: block;
  margin-bottom: 28px;
}
.nav { display: flex; flex-direction: column; gap: 6px; }
.nav a {
  color: var(--dim);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 14px;
}
.nav a:hover { background: #202833; color: #fff; }
.nav a.current { background: #1a2a2e; color: var(--teal); }
.rail-cta {
  display: block;
  margin-top: 28px;
  background: var(--teal);
  color: #042421;
  text-align: center;
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
}
.pane { padding: 32px 40px 72px; max-width: 980px; }
.hero {
  background: linear-gradient(135deg, #1a2430, #15222a);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 30px;
  margin-bottom: 22px;
}
.hero h1 { font-size: 26px; line-height: 1.4; margin-bottom: 12px; }
.lead { color: var(--dim); margin-bottom: 16px; }
.btn-go {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--teal);
  color: #042421;
  text-decoration: none;
  padding: 11px 20px;
  border-radius: 8px;
  font-weight: 700;
}
.btn-go:hover { background: #49d4c7; }
.btn-go svg { width: 18px; height: 18px; }
.note { color: var(--dim); font-size: 13px; margin-top: 10px; }
.mod {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px 22px;
  margin-bottom: 16px;
}
.mod h2 {
  font-size: 18px;
  color: var(--teal);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}
.mod p { margin-bottom: 10px; }
.mod ol, .mod ul { margin: 8px 0 10px 20px; }
.mod li { margin-bottom: 6px; }
.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.tile {
  background: #151b23;
  border: 1px solid var(--line);
  padding: 14px;
  border-radius: 8px;
}
.faq-item { padding: 12px 0; border-bottom: 1px dashed var(--line); }
.faq-item h3 { font-size: 16px; margin-bottom: 6px; }
.foot {
  margin-top: 28px;
  color: var(--dim);
  font-size: 12px;
  line-height: 1.7;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.foot p { margin-bottom: 8px; }
.foot nav { margin-bottom: 10px; }
.foot nav a { color: #b7c4d4; margin-right: 12px; text-decoration: none; }
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .rail { position: relative; height: auto; }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .pane { padding: 20px 16px 56px; }
  .grid2 { grid-template-columns: 1fr; }
}