:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #202430;
  --muted: #60687a;
  --line: #dfe3ec;
  --accent: #3d68c7;
  --accent-soft: #e9efff;
  --warn: #fff4df;
  --warn-line: #e7bd6c;
  --danger: #fff0f0;
  --danger-line: #e59a9a;
  --code: #f1f3f8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
}

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

a:hover {
  text-decoration: underline;
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 18px 18px;
}

.site-title {
  margin: 0;
  font-size: 1.55rem;
  letter-spacing: 0.02em;
}

.site-title a {
  color: var(--text);
}

.site-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

nav {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: 0.92rem;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 18px 48px;
}

section,
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  margin: 0 0 18px;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

h1 {
  margin: 0 0 14px;
  font-size: 1.9rem;
}

h2 {
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 1.35rem;
}

h3 {
  margin: 22px 0 8px;
  font-size: 1.08rem;
}

p {
  margin: 0 0 12px;
}

ul,
ol {
  margin: 8px 0 14px 1.35rem;
  padding: 0;
}

li {
  margin: 4px 0;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

pre {
  margin: 12px 0 16px;
  padding: 14px;
  overflow-x: auto;
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 12px;
  line-height: 1.55;
}

.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 650;
}

.notice {
  background: var(--warn);
  border-color: var(--warn-line);
}

.danger {
  background: var(--danger);
  border-color: var(--danger-line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

.button {
  display: inline-block;
  padding: 10px 16px;
  margin: 6px 8px 6px 0;
  color: #fff;
  background: var(--accent);
  border-radius: 10px;
  font-weight: 650;
}

.button.secondary {
  color: var(--accent);
  background: var(--accent-soft);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 16px;
}

th,
td {
  border: 1px solid var(--line);
  padding: 10px;
  vertical-align: top;
}

th {
  background: var(--accent-soft);
  text-align: left;
}

footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 18px 36px;
  color: var(--muted);
  font-size: 0.9rem;
}

.small {
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .header-inner,
  main,
  footer {
    padding-left: 14px;
    padding-right: 14px;
  }

  section,
  .card {
    padding: 18px;
    border-radius: 14px;
  }

  h1 {
    font-size: 1.55rem;
  }

  .site-title {
    font-size: 1.35rem;
  }
}