:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #7c3aed;
  --border: #e5e5ea;
  --max: 760px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

header {
  background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%);
  color: #fff;
  padding: 2rem 1.25rem 1.75rem;
}

header .wrap {
  max-width: var(--max);
  margin: 0 auto;
}

header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
  font-weight: 700;
}

header p {
  margin: 0;
  opacity: 0.9;
  font-size: 0.95rem;
}

nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.875rem;
}

nav a {
  color: var(--accent);
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem 1.5rem;
  margin-top: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

article h2 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.65rem;
  padding-top: 0.25rem;
}

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

article h3 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
}

article p,
article li {
  color: var(--text);
}

article ul,
article ol {
  padding-left: 1.25rem;
}

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

article code {
  font-size: 0.88em;
  background: var(--bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.meta {
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 1.25rem;
}

.lang-divider {
  border: 0;
  border-top: 2px dashed var(--border);
  margin: 2.5rem 0 2rem;
}

.en-block {
  font-size: 0.98rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1rem 0;
}

th,
td {
  padding: 0.5rem 0.35rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

thead th {
  border-bottom-width: 2px;
}

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  color: var(--muted);
  font-size: 0.8125rem;
  text-align: center;
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f12;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --muted: #98989d;
    --border: #38383a;
  }
}