body {
  min-height: 100vh;
  background: var(--background-color);
  color: var(--text-color);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.65;
}
a {
  color: var(--primary-color);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
h1,
h2,
h3 {
  color: var(--heading-color);
  line-height: 1.28;
}
h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}
h2 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}
.container {
  width: min(calc(100% - 32px), var(--container));
  margin-inline: auto;
}
.narrow {
  max-width: 820px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 1000;
  background: #fff;
  padding: 10px 16px;
  border: 2px solid var(--primary-color);
}
.skip-link:focus {
  top: 16px;
}
:focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 3px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 18px;
  border: 1px solid var(--primary-color);
  border-radius: 9px;
  background: var(--primary-color);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}
.button:hover {
  background: var(--primary-hover);
  text-decoration: none;
}
.button-secondary {
  background: #fff;
  color: var(--primary-color);
  border-color: var(--border-color);
}
.button-danger {
  background: var(--danger-color);
  border-color: var(--danger-color);
}
.button-sm {
  min-height: 38px;
  padding: 7px 14px;
}
.button-block {
  width: 100%;
}
.text-link,
.link-button {
  font-weight: 700;
}
.link-button {
  border: 0;
  background: none;
  color: var(--primary-color);
  padding: 4px;
  cursor: pointer;
}
.card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.eyebrow,
.section-heading > span,
.admin-page-heading > div > span {
  color: var(--primary-color);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}
.status,
.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 3px 9px;
  background: #edf2f7;
  color: #475569;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
}
.status-enrolling {
  background: #dcfce7;
  color: #166534;
}
.status-ended,
.status-offline {
  background: #fee2e2;
  color: #991b1b;
}
.status-preparing {
  background: #fef3c7;
  color: #92400e;
}
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.tag-list span {
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: #1e40af;
  font-size: 0.8rem;
}
.prose {
  line-height: 1.85;
}
.prose h2 {
  margin: 28px 0 12px;
}
.prose p,
.prose ul,
.prose ol,
.prose table {
  margin: 10px 0;
}
.prose img {
  height: auto;
}
.empty-state,
.error-page {
  text-align: center;
  padding: 80px 20px;
}
.error-page > strong {
  display: block;
  color: var(--primary-color);
  font-size: 5rem;
  line-height: 1;
}
.error-page h1 {
  margin: 12px 0;
}
.error-page p {
  margin-bottom: 24px;
  color: var(--muted-text-color);
}