:root {
  color-scheme: light;
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-text: #202124;
  --color-muted: #626871;
  --color-border: #dfe3e8;
  --color-primary: #356859;
  --color-primary-dark: #254c40;
  --color-preview-bg: #fff8df;
  --color-preview-border: #e3bd4f;
  --content-width: 760px;
  --page-padding: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-primary-dark);
}

a:focus-visible {
  outline: 3px solid var(--color-preview-border);
  outline-offset: 3px;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header__inner {
  display: flex;
  max-width: var(--content-width);
  min-height: 64px;
  margin: 0 auto;
  padding: 12px var(--page-padding);
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-name {
  color: var(--color-text);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-nav a {
  font-size: 14px;
  text-decoration: none;
}

main {
  max-width: var(--content-width);
  min-height: calc(100vh - 180px);
  margin: 0 auto;
  padding: 48px var(--page-padding) 72px;
}

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

h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 6vw, 42px);
}

h2 {
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  font-size: 24px;
}

h3 {
  margin: 32px 0 12px;
  font-size: 19px;
}

p,
li {
  overflow-wrap: anywhere;
}

.document-meta {
  margin-bottom: 32px;
  color: var(--color-muted);
}

.preview-notice {
  margin: 24px 0 32px;
  padding: 16px 18px;
  border: 1px solid var(--color-preview-border);
  border-radius: 8px;
  background: var(--color-preview-bg);
}

.preview-notice strong {
  display: block;
  margin-bottom: 4px;
}

.link-cards {
  display: grid;
  margin: 36px 0;
  gap: 16px;
}

.link-card {
  display: block;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  color: var(--color-text);
  background: var(--color-surface);
  text-decoration: none;
}

.link-card:hover {
  border-color: var(--color-primary);
}

.link-card strong {
  display: block;
  margin-bottom: 4px;
  color: var(--color-primary);
  font-size: 18px;
}

table {
  display: block;
  width: 100%;
  margin: 24px 0;
  border-collapse: collapse;
  overflow-x: auto;
}

th,
td {
  min-width: 140px;
  padding: 12px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef2f0;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  background: var(--color-surface);
}

.site-footer__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 24px var(--page-padding);
  font-size: 13px;
  text-align: center;
}

.site-footer p {
  margin: 4px 0;
}

@media (max-width: 600px) {
  :root {
    --page-padding: 18px;
  }

  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  main {
    padding-top: 36px;
  }

  h2 {
    margin-top: 40px;
  }
}

@media print {
  .site-header,
  .site-footer,
  .preview-notice {
    display: none;
  }

  body {
    background: #ffffff;
    font-size: 12pt;
  }

  main {
    max-width: none;
    padding: 0;
  }
}