:root {
  --bg: #0d1117;
  --panel: #161b22;
  --line: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --acc: #58a6ff;
  --acc-dim: #1f6feb;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Cascadia Code", "Sarasa Mono SC", "Consolas", "Microsoft YaHei", monospace;
  line-height: 1.7;
}

a { color: var(--acc); text-decoration: none; }
a:hover { text-decoration: underline; }

.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 4vw;
  background: #010409;
  border-bottom: 1px solid var(--line);
}

.brand { color: var(--text); font-weight: 700; }

.bar nav { display: flex; flex-wrap: wrap; gap: 0.85rem; font-size: 0.82rem; }

.hero {
  padding: 2.4rem 4vw 1.4rem;
  border-bottom: 1px solid var(--line);
}

.hero h1 { font-size: 1.7rem; color: #fff; max-width: 40rem; }
.hero p { max-width: 46rem; color: var(--muted); }
.hero time { color: var(--acc); font-size: 0.8rem; }

#keys {
  border-bottom: 1px solid var(--line);
}

#keys > h2 {
  margin: 0;
  padding: 1.5rem 4vw 0.8rem;
  color: #fff;
}

#keys > p {
  margin: 0 4vw 1rem;
  color: var(--muted);
  max-width: 46rem;
}

.quad {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  margin: 0;
}

.quad article {
  background: var(--panel);
  padding: 1.2rem 1.3rem 1rem;
}

.quad h3 { margin: 0.4rem 0; color: var(--acc); }

kbd {
  display: inline-block;
  padding: 0.05rem 0.4rem;
  border: 1px solid var(--line);
  background: #010409;
  border-radius: 4px;
  font-size: 0.8rem;
  color: #fff;
}

.search-demo,
.paste,
.compare,
.steps,
.depth,
.faq {
  padding: 1.6rem 4vw 1.8rem;
  border-bottom: 1px solid var(--line);
}

.search-demo h2,
.paste h2,
.compare h2,
.steps h2,
.depth h2,
.faq h2,
.quad-wrap h2 {
  color: #fff;
}

.fake {
  max-width: 36rem;
  background: #010409;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}

.fake .q {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.fake ul { list-style: none; margin: 0; padding: 0; }

.fake li {
  display: flex;
  justify-content: space-between;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid #21262d;
  color: var(--text);
}

.fake li:last-child { border-bottom: 0; }
.fake li em { color: var(--acc); font-style: normal; }
.fake .meta { color: var(--muted); font-size: 0.78rem; }

.notes {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.8rem;
}

.note {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.9rem 0.9rem 0.3rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  border: 1px solid var(--line);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th { background: #21262d; color: var(--acc); }

.vline {
  list-style: none;
  margin: 1rem 0;
  padding: 0 0 0 1.1rem;
  border-left: 2px solid var(--acc-dim);
}

.vline li {
  position: relative;
  padding: 0 0 1.1rem 1rem;
}

.vline li::before {
  content: "";
  position: absolute;
  left: -1.45rem;
  top: 0.45rem;
  width: 0.65rem;
  height: 0.65rem;
  background: var(--acc);
  border-radius: 50%;
}

.faq details {
  background: var(--panel);
  border: 1px solid var(--line);
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.8rem;
}

summary { cursor: pointer; color: var(--acc); }

.foot {
  padding: 1.4rem 4vw 2rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.foot p { margin: 0 0 0.45rem; }

@media (max-width: 800px) {
  .quad, .notes { grid-template-columns: 1fr; }
}