:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #0284c7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --border: #334155;
    --accent: #38bdf8;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  line-height: 1.65;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

header {
  margin-bottom: 1.75rem;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.site-logo {
  width: 36px;
  height: 36px;
  border-radius: 0.375rem;
  flex-shrink: 0;
}

.brand {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

h1 {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  line-height: 1.25;
}

.meta {
  font-size: 0.8125rem;
  color: var(--muted);
  margin: 0;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
}

.toolbar label {
  font-size: 0.8125rem;
  color: var(--muted);
}

.toolbar select {
  font-size: 0.875rem;
  padding: 0.35rem 2rem 0.35rem 0.65rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.toolbar a {
  font-size: 0.8125rem;
  color: var(--accent);
  text-decoration: none;
  margin-left: auto;
}

.toolbar a:hover {
  text-decoration: underline;
}

article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem 1.35rem;
}

article h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

article h2:first-child {
  margin-top: 0;
}

article p {
  margin: 0 0 0.85rem;
  color: var(--text);
}

article ul {
  margin: 0 0 0.85rem;
  padding-left: 1.25rem;
}

article li {
  margin-bottom: 0.35rem;
}

article a {
  color: var(--accent);
}

footer {
  margin-top: 2rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}