/* Old Bird shared stylesheet — colors mirror the in-app viewer.html */
:root {
  --bg: #0e1116;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #3fb950;
  --accent-dim: #107050;
  --accent-dark: #0a4f38;
  --danger: #f85149;
  --panel: #161b22;
  --border: #30363d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

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

code, pre, kbd, .mono {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}
code {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
}
pre {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: transparent; border: 0; padding: 0; }

.site {
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}
.topbar .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
}
.topbar .brand .dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(63, 185, 80, 0.6);
}
.topbar nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.topbar nav a {
  color: var(--muted);
  font-size: 0.95rem;
}
.topbar nav a.active { color: var(--fg); }
.topbar nav a:hover { color: var(--accent); text-decoration: none; }

h1 {
  font-size: 2.5rem;
  line-height: 1.1;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}
h3 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.5rem;
  color: var(--fg);
}
.tagline {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0 0 2rem;
}

.cta-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.25rem 0 0.5rem;
}
.cta {
  display: inline-block;
  padding: 0.7rem 1.15rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  font-weight: 600;
  font-size: 0.95rem;
}
.cta:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.cta.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0e1116;
}
.cta.primary:hover { background: #4ec25e; border-color: #4ec25e; color: #0e1116; }
.cta.disabled { opacity: 0.65; cursor: not-allowed; }
.cta.disabled:hover { border-color: var(--border); color: var(--fg); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 0;
}
.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
  color: var(--fg);
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
}
.card .card-title {
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--fg);
}
.card .card-body {
  color: var(--muted);
  font-size: 0.95rem;
}
.card .card-arrow {
  color: var(--accent);
  margin-top: 0.6rem;
  font-size: 0.9rem;
}

ul, ol { padding-left: 1.4rem; }
li { margin: 0.3rem 0; }
li code { font-size: 0.88em; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}
.feature-grid .item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
}
.feature-grid .item strong { color: var(--accent); }
.feature-grid .item .desc {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.25rem;
}

.setting {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin: 0.75rem 0;
}
.setting .key {
  display: inline-block;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85em;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05em 0.45em;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.setting .name {
  font-weight: 600;
  color: var(--fg);
}
.setting .default {
  color: var(--muted);
  font-size: 0.88rem;
  margin-left: 0.5rem;
}
.setting p {
  margin: 0.4rem 0 0;
  color: var(--fg);
}
.setting p.note {
  color: var(--muted);
  font-size: 0.92rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
th, td {
  text-align: left;
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  background: var(--bg);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--panel);
  border-radius: 0 6px 6px 0;
  padding: 0.8rem 1rem;
  margin: 1rem 0;
}
.callout.warn { border-left-color: var(--danger); }
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--accent); }
.callout.warn strong { color: var(--danger); }

.section-intro { color: var(--muted); margin: 0 0 1rem; }

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: space-between;
}
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

.toc {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1rem 0 2rem;
}
.toc strong { color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; }
.toc ul { list-style: none; padding-left: 0; columns: 2; column-gap: 1.5rem; margin: 0.5rem 0 0; }
.toc li { margin: 0.2rem 0; }
@media (max-width: 600px) { .toc ul { columns: 1; } }

@media (max-width: 600px) {
  h1 { font-size: 2rem; }
  .topbar { flex-direction: column; align-items: flex-start; }
}