:root {
  --bg: #F7F8FA;
  --surface: #FFFFFF;
  --surface-secondary: #F1F3F5;
  --text: #17191D;
  --text-secondary: #4B5563;
  --muted: #69707D;
  --border: #E4E7EC;
  --border-strong: #D0D5DD;
  --danger: #D92D20;
  --warning: #D97706;
  --success: #16803C;
  --info: #2563EB;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --container: 1120px;
  --font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
a { color: var(--info); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .container { padding: 0 24px; } }
.page-main { padding-bottom: 48px; }
h1 { font-size: clamp(2rem, 5vw, 2.75rem); line-height: 1.15; margin: 0 0 12px; }
h2 { font-size: clamp(1.5rem, 3vw, 1.875rem); margin: 32px 0 16px; }
h3 { font-size: 1.125rem; margin: 0 0 8px; }
.lead { font-size: 1.125rem; color: var(--text-secondary); max-width: 640px; }
.muted { color: var(--muted); font-size: 0.9375rem; }
.subtitle { font-size: 1.25rem; color: var(--text-secondary); margin-bottom: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; gap: 16px; min-height: 64px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); text-decoration: none; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; background: var(--danger); color: #fff;
  border-radius: 6px; font-size: 14px; font-weight: 800;
}
.logo-text { letter-spacing: 0.04em; font-size: 0.9375rem; }
.nav-desktop { display: none; gap: 20px; margin-left: auto; }
.nav-link { color: var(--text-secondary); font-size: 0.9375rem; }
.header-search-btn {
  margin-left: auto; padding: 8px 14px; background: var(--text); color: #fff;
  border-radius: var(--radius-sm); font-size: 0.875rem; text-decoration: none;
}
.menu-toggle {
  display: flex; background: none; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 8px 12px; cursor: pointer; font-size: 1.25rem;
}
.nav-mobile { display: flex; flex-direction: column; padding: 12px 16px; border-top: 1px solid var(--border); background: var(--surface); }
.nav-mobile[hidden] { display: none; }
.nav-mobile a { padding: 10px 0; color: var(--text); }
@media (min-width: 768px) {
  .nav-desktop { display: flex; }
  .header-search-btn { margin-left: 0; }
  .menu-toggle { display: none; }
}

.hero { padding: 32px 0 24px; }
.eyebrow { font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 8px; }
.section { margin-top: 40px; }

.search-form { display: flex; gap: 8px; flex-wrap: wrap; max-width: 640px; }
.search-form input[type="search"] {
  flex: 1 1 200px; min-height: 48px; padding: 12px 16px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  font-size: 1rem; background: var(--surface);
}
.search-form-hero input[type="search"] { min-height: 52px; font-size: 1.0625rem; }
.search-form button, .btn {
  min-height: 48px; padding: 12px 20px; border: none; border-radius: var(--radius-sm);
  background: var(--text); color: #fff; font-size: 0.9375rem; cursor: pointer;
}
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border-strong); }

.card-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .card-grid-errors { grid-template-columns: repeat(3, 1fr); } }
.card {
  display: block; padding: 20px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  color: inherit; text-decoration: none; transition: border-color .15s, box-shadow .15s;
}
.card:hover { border-color: var(--border-strong); box-shadow: 0 2px 8px rgb(16 24 40 / 6%); text-decoration: none; }
.error-code { font-family: var(--mono); font-size: 1.125rem; font-weight: 600; color: var(--text); }
.error-code-lg { font-family: var(--mono); font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; display: block; word-break: break-all; }
.error-code-box {
  padding: 24px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); margin: 24px 0;
}
.error-code-meta { color: var(--muted); margin: 8px 0 16px; }
.meta { font-size: 0.8125rem; color: var(--muted); }

.breadcrumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 0.875rem; color: var(--muted); padding: 16px 0; }
.bc-sep { opacity: 0.5; }
.content-section { margin-top: 32px; padding-top: 8px; }
.prose p { margin: 0 0 12px; }
.link-list { list-style: none; padding: 0; margin: 0; }
.link-list li { padding: 10px 0; border-bottom: 1px solid var(--border); }
.home .hero .lead strong { color: var(--text); }

.pagination { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 24px; font-size: 0.9375rem; }
.pagination-info { color: var(--muted); }
.link-list-compact li { padding: 6px 0; font-size: 0.9375rem; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 0.75rem; background: var(--surface-secondary); margin-right: 6px; }
.badge-info { background: #EFF6FF; color: var(--info); }
.alert { padding: 12px 16px; border-radius: var(--radius-sm); }
.alert-warning { background: #FFFBEB; color: var(--warning); border: 1px solid #FDE68A; }

.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 16px; margin-bottom: 8px; background: var(--surface); }
.source-list { list-style: none; padding: 0; }
.source-list li { padding: 12px 0; border-bottom: 1px solid var(--border); }

.search-results { list-style: none; padding: 0; }
.search-result-item { display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; padding: 14px 0; border-bottom: 1px solid var(--border); color: inherit; }
.empty-state { padding: 24px; background: var(--surface-secondary); border-radius: var(--radius-md); }

.site-footer { margin-top: 48px; padding: 32px 0 24px; background: var(--surface); border-top: 1px solid var(--border); }
.footer-grid { display: grid; gap: 24px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .footer-grid { grid-template-columns: repeat(3, 1fr); } }
.footer-links { list-style: none; padding: 0; margin: 8px 0 0; }
.footer-links li { margin-bottom: 6px; }
.footer-bottom { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 0.875rem; }

.search-suggestions {
  position: absolute; z-index: 50; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  max-width: 640px; width: 100%; margin-top: 4px; box-shadow: 0 4px 16px rgb(16 24 40 / 10%);
}
.search-suggestions[hidden] { display: none; }
.search-suggestions a { display: block; padding: 10px 14px; color: var(--text); border-bottom: 1px solid var(--border); }
.search-suggestions a:hover { background: var(--surface-secondary); text-decoration: none; }

.admin { background: var(--surface-secondary); }
.admin-stats { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
.data-table th, .data-table td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
.data-table th { background: var(--surface-secondary); }

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