:root {
  --bg: #0f1115;
  --bg-card: #171a21;
  --text: #e8eaed;
  --muted: #9aa2af;
  --accent: #4f7cff;
  --accent-text: #ffffff;
  --border: #2a2e38;
  --danger: #ff6b6b;
  --ok: #34c98f;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--accent-text);
  flex-shrink: 0;
}

nav.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.95rem;
}

nav.site-nav a:first-child {
  margin-left: 0;
}

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

main {
  padding: 40px 0 80px;
}

section {
  margin-bottom: 56px;
}

h1 {
  font-size: 2.1rem;
  margin: 0 0 12px;
}

h2 {
  font-size: 1.4rem;
  margin: 0 0 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.tagline {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 28px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  max-width: 420px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  padding: 14px 22px;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.btn-download[aria-disabled="true"] {
  background: #3a3d45;
  color: var(--muted);
  cursor: not-allowed;
  pointer-events: none;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: 14px;
  gap: 12px;
  flex-wrap: wrap;
}

.sha {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  word-break: break-all;
  background: #0c0e12;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  margin-top: 12px;
}

.sha button {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 4px;
  padding: 2px 8px;
  cursor: pointer;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.status-note {
  font-size: 0.9rem;
  margin-top: 12px;
}

.status-note.error {
  color: var(--danger);
}

.status-note.ok {
  color: var(--ok);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.feature-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

ol, ul {
  padding-left: 22px;
}

.changelog-body {
  white-space: pre-wrap;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  color: var(--muted);
}

details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

details summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  color: var(--muted);
  margin: 10px 0 0;
}

.disclaimer {
  font-size: 0.82rem;
  color: var(--muted);
  border-left: 3px solid var(--border);
  padding-left: 12px;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.85rem;
}

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

footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.6rem;
  }
  .meta-row {
    flex-direction: column;
  }
}