:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #238636;
  --accent-hover: #2ea043;
  --gold: #d4a853;
  --link: #58a6ff;
  --danger: #f85149;
  --radius: 10px;
  --max: 1120px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 999;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
}

.logo-link img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}

.nav-main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1rem;
}

.nav-main a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.nav-main a:hover {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  text-decoration: none;
}

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  text-decoration: none;
  color: #fff;
}

.hero {
  background: linear-gradient(160deg, #0d1117 0%, #0f1a14 45%, #0d1117 100%);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.2;
  font-weight: 800;
}

.hero-lead {
  margin: 0 0 1.5rem;
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 65ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
}

.stat-card strong {
  display: block;
  font-size: 1.35rem;
  color: var(--gold);
  margin-bottom: 0.25rem;
}

.stat-card span {
  font-size: 0.85rem;
  color: var(--muted);
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.prose {
  font-size: 1.02rem;
}

.prose h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.55rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.prose h3 {
  margin: 1.75rem 0 0.65rem;
  font-size: 1.2rem;
}

.prose p {
  margin: 0 0 1rem;
  color: #c9d1d9;
}

.prose ul,
.prose ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
  color: #c9d1d9;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

.prose th,
.prose td {
  border: 1px solid var(--border);
  padding: 0.65rem 0.85rem;
  text-align: left;
}

.prose th {
  background: var(--surface2);
  color: var(--text);
}

.prose td {
  background: var(--surface);
}

.figure {
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
}

.figure figcaption {
  padding: 0.65rem 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
}

.toc h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  border: none;
}

.toc ol {
  margin: 0;
  padding-left: 1.25rem;
}

.toc a {
  color: var(--link);
}

.alert {
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin: 1.5rem 0;
  border-left: 4px solid var(--danger);
  background: rgba(248, 81, 73, 0.08);
  color: #f0b4b0;
  font-size: 0.95rem;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.card-link {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.1s;
}

.card-link:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
}

.card-link h3 {
  margin: 0 0 0.5rem;
  color: var(--text);
  font-size: 1.1rem;
}

.card-link p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 2rem 1.25rem;
  margin-top: 3rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: flex-start;
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.footer-nav a {
  color: var(--muted);
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: var(--muted);
}

@media (max-width: 640px) {
  .nav-main {
    width: 100%;
    justify-content: center;
  }

  .header-inner {
    justify-content: center;
  }
}