:root {
  --bg: #0d1117;
  --bg-elevated: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #10b981;
  --accent-hover: #34d399;
  --accent-dim: #059669;
  --danger: #f85149;
  --radius: 12px;
  --max-w: 720px;
  --header-h: 56px;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

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

body {
  margin: 0;
  min-height: 100dvh;
}

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

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #0d1117;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-logo {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.site-nav {
  display: none;
  gap: 1rem;
  align-items: center;
  margin-left: auto;
}

.site-nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.nav-toggle {
  margin-left: auto;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }
  .nav-toggle {
    display: none;
  }
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  padding: 0.5rem 1rem 1rem;
  border-bottom: 1px solid var(--border);
  gap: 0.5rem;
}

.mobile-nav[hidden] {
  display: none;
}

.site-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem 1rem 5rem;
}

.hero {
  padding: 2rem 0 1.5rem;
  background: linear-gradient(160deg, rgba(16, 185, 129, 0.12) 0%, transparent 55%);
  border-radius: var(--radius);
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.legacy-notice {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
}

.prose h1 {
  font-size: 1.75rem;
  margin: 0 0 1rem;
}

.prose h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
}

.prose h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}

.prose p,
.prose ul,
.prose ol {
  color: var(--text-muted);
}

.prose strong {
  color: var(--text);
}

.prose pre {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.prose :not(pre) > code {
  overflow-wrap: anywhere;
}

.summary-block {
  font-size: 1.05rem;
  color: var(--text);
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.coin-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  text-align: center;
  min-height: 88px;
}

.coin-card .icon {
  width: 32px;
  height: 32px;
  margin: 0 auto 0.35rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-dim), var(--accent));
  opacity: 0.85;
}

.data-table-wrap,
.legal-table-wrap {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0;
}

.data-table-wrap .data-table {
  margin: 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1rem 0;
}

.data-table th,
.data-table td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: left;
}

.data-table th {
  background: var(--bg-elevated);
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius);
  border: none;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #042f1a;
}

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

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

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.875rem;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: none;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: '›';
  margin-right: 0.35rem;
  color: var(--border);
}

.last-updated {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.site-footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1rem 6rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-brand a {
  color: var(--text);
  font-weight: 600;
}

.install-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem calc(0.65rem + env(safe-area-inset-bottom));
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  z-index: 40;
  font-size: 0.9rem;
}

.install-bar[hidden] {
  display: none;
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
}

.legal-table th,
.legal-table td {
  border: 1px solid var(--border);
  padding: 0.5rem;
}

.legal-contact-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.legal-notice {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
}

.request-form .field {
  margin-bottom: 0.75rem;
}

.request-form label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.request-form input,
.request-form textarea {
  width: 100%;
  padding: 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.request-list {
  list-style: none;
  padding: 0;
}

.request-list li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
}

/* Inline links must not rely on colour alone (WCAG 1.4.1) */
main p a,
main li a,
main td a,
main dd a,
main details a,
main .legacy-notice a {
  text-decoration: underline;
  text-underline-offset: 2px;
}