:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #14171f;
  --text-muted: #667085;
  --primary: #2554e8;
  --primary-dark: #1a3fb8;
  --danger: #dc2626;
  --warning: #d97706;
  --success: #059669;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 32px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.nav .brand { font-weight: 800; font-size: 18px; letter-spacing: -.01em; }
.nav .links { display: flex; gap: 20px; align-items: center; }
.nav .links a { color: var(--text); font-weight: 500; font-size: 14px; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 640px; margin: 0 auto; padding: 0 24px; }

.hero { padding: 72px 0 48px; text-align: center; }
.hero h1 { font-size: 42px; font-weight: 800; letter-spacing: -.02em; margin: 0 0 16px; max-width: 760px; margin-left:auto; margin-right:auto; }
.hero p.lead { font-size: 19px; color: var(--text-muted); max-width: 620px; margin: 0 auto 32px; }

.btn {
  display: inline-block; padding: 11px 22px; border-radius: 8px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--primary); text-decoration: none; }
.btn-danger { background: #fff; color: var(--danger); border-color: #fecaca; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-block { width: 100%; text-align: center; }
.btn-link-plain { background: none; border: none; padding: 0; color: var(--primary); font-size: inherit; cursor: pointer; text-decoration: none; }
.btn-link-plain:hover { text-decoration: underline; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.section { padding: 56px 0; }
.section h2 { font-size: 28px; font-weight: 800; text-align: center; letter-spacing: -.01em; margin-bottom: 8px; }
.section p.sub { text-align: center; color: var(--text-muted); margin-bottom: 40px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 800px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.pricing-card { text-align: center; position: relative; }
.pricing-card.featured { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary); }
.pricing-card .badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.pricing-card .price { font-size: 36px; font-weight: 800; margin: 12px 0 4px; }
.pricing-card .price span { font-size: 15px; font-weight: 500; color: var(--text-muted); }
.pricing-card ul { list-style: none; padding: 0; margin: 20px 0; text-align: left; font-size: 14px; color: var(--text-muted); }
.pricing-card ul li { padding: 6px 0; }
.pricing-card ul li:before { content: "✓ "; color: var(--success); font-weight: 700; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-group input, .form-group select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 15px;
}
.form-group .hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.alert { padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }
.alert-info { background: #eff6ff; color: var(--primary-dark); border: 1px solid #bfdbfe; }

.badge-severity { font-size: 11px; font-weight: 700; text-transform: uppercase; padding: 2px 8px; border-radius: 999px; }
.badge-major { background: #fef2f2; color: var(--danger); }
.badge-notable { background: #fffbeb; color: var(--warning); }
.badge-minor { background: #f3f4f6; color: var(--text-muted); }

.changelist { list-style: none; padding: 0; margin: 0; }
.changelist li { padding: 14px 0; border-bottom: 1px solid var(--border); }
.changelist li:last-child { border-bottom: none; }

.faq dt { font-weight: 700; margin-top: 18px; }
.faq dd { margin: 6px 0 0; color: var(--text-muted); }

.footer { padding: 32px 0; text-align: center; color: var(--text-muted); font-size: 13px; border-top: 1px solid var(--border); margin-top: 40px; }

table.simple { width: 100%; border-collapse: collapse; font-size: 14px; }
table.simple th, table.simple td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
table.simple th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }

pre.diff { background: #0d1117; color: #c9d1d9; padding: 16px; border-radius: 8px; overflow-x: auto; font-size: 13px; line-height: 1.6; }
pre.diff .add { color: #7ee787; }
pre.diff .rem { color: #ff7b72; }

.stat-row { display: flex; gap: 20px; flex-wrap: wrap; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 22px; min-width: 140px; }
.stat .value { font-size: 26px; font-weight: 800; }
.stat .label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; }