*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { height: 100%; }
body {
  min-height: 100%;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #1e293b;
  background: #eef2f7;
}

.demo-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: rgba(248, 250, 252, 0.92);
  border-bottom: 1px solid #dbe3ee;
  backdrop-filter: blur(10px);
}
.demo-back {
  color: #2563eb;
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
}
.demo-bar h1 {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.demo-bar p {
  margin: 0;
  font-size: 11px;
  color: #64748b;
}
.demo-hint {
  margin-left: auto;
  font-size: 11px;
  color: #64748b;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 999px;
  padding: 4px 10px;
  white-space: nowrap;
}

.variant-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 14px 10px;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
}
.variant-switch a,
.variant-switch button {
  appearance: none;
  border: 1px solid #dbe3ee;
  background: #f8fafc;
  color: #334155;
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  padding: 5px 9px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
}
.variant-switch a.is-current,
.variant-switch button.is-current {
  background: #4c1d95;
  border-color: #4c1d95;
  color: #f5f3ff;
}

.page-shell {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 20px 120px;
}
.page-kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7c3aed;
  margin: 0 0 8px;
}
.page-shell h2 {
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.03em;
}
.page-meta {
  margin: 0 0 22px;
  font-size: 13px;
  color: #64748b;
}
.page-shell p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.65;
  color: #334155;
}
.page-card {
  margin: 18px 0;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid #dbe3ee;
  border-radius: 12px;
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
}
.page-card strong { display: block; margin-bottom: 4px; font-size: 13px; }
.page-card span { font-size: 13px; color: #64748b; line-height: 1.45; }

.variant-tag {
  position: fixed;
  left: 12px;
  bottom: 12px;
  z-index: 30;
  font-size: 11px;
  font-weight: 700;
  color: #4c1d95;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #ddd6fe;
  border-radius: 999px;
  padding: 4px 10px;
  pointer-events: none;
}
body[data-variant="07"] .variant-tag { bottom: auto; top: 58px; }
body[data-variant="05"] .variant-tag { bottom: 12px; }