/* WTO research web — tabbed analysis UI */
:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface2: #243044;
  --text: #e8eef5;
  --muted: #8b9cb3;
  --accent: #c9a227;
  --accent-dim: #8a7020;
  --accent-bg: rgba(201, 162, 39, 0.08);
  --border: #2d3d52;
  --tab-active: #1e3a5f;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.65;
  font-size: 15px;
}

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

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.site-title { font-size: 1.15rem; font-weight: 600; }
.site-title a { color: var(--accent); }
.site-title a:hover { text-decoration: none; color: #e4c04a; }

.site-nav { display: flex; gap: 1.25rem; list-style: none; }
.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.container { max-width: 960px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }

h1 { font-family: "IBM Plex Serif", Georgia, serif; font-size: 1.55rem; color: var(--accent); margin-bottom: 0.5rem; font-weight: 600; }
h2 { font-family: "IBM Plex Serif", serif; font-size: 1.2rem; margin: 1.25rem 0 0.6rem; color: var(--text); }
.subtitle { color: var(--muted); font-size: 0.95rem; margin-bottom: 1.25rem; max-width: 40rem; }

/* Home hero */
.home-hero { text-align: center; padding: 2.5rem 1rem 1.5rem; }
.home-hero h1 { font-size: 1.85rem; }
.lead { color: var(--muted); max-width: 38rem; margin: 0.75rem auto 0; line-height: 1.7; }

.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}
.quick-link {
  background: var(--surface);
  border-radius: 8px;
  padding: 1.35rem;
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}
.quick-link:hover { border-color: var(--accent); text-decoration: none; }
.quick-link-title { font-size: 1rem; color: var(--accent); margin-bottom: 0.35rem; font-weight: 600; }
.quick-link-desc { font-size: 0.88rem; color: var(--muted); }

.btn {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  font-size: 0.92rem;
  background: var(--accent-dim);
  color: #fff;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-family: inherit;
}
.btn:hover { background: var(--accent); text-decoration: none; color: #0f1419; }

.footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.25rem;
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 2rem;
}
.footer code { font-size: 0.85em; color: var(--accent-dim); }

/* Tabs — one line labels, horizontal scroll on small screens */
.tab-bar-wrap {
  overflow-x: auto;
  margin: 0 -0.25rem 1rem;
  padding-bottom: 2px;
  -webkit-overflow-scrolling: touch;
}
.tab-bar {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.35rem;
  min-width: min-content;
  padding: 0.25rem;
}
.tab-btn {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 0.5rem 0.85rem;
  font-size: 0.82rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.tab-btn:hover { color: var(--text); border-color: var(--accent-dim); }
.tab-btn.active {
  background: var(--tab-active);
  color: var(--accent);
  border-color: var(--accent-dim);
  font-weight: 600;
}

.tab-panel {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0 8px 8px 8px;
  padding: 1.25rem 1.35rem;
  min-height: 280px;
}
.tab-panel.active { display: block; }

.tab-panel .loading { color: var(--muted); font-style: italic; }
.tab-panel .err { color: #e88; }

/* Markdown body */
.md-body {
  font-family: "IBM Plex Sans", sans-serif;
  max-width: 100%;
  overflow-x: auto;
}
.md-body h1, .md-body h2, .md-body h3, .md-body h4 {
  font-family: "IBM Plex Serif", serif;
  margin-top: 1.1em;
  margin-bottom: 0.45em;
  color: var(--text);
}
.md-body h1 { font-size: 1.35rem; color: var(--accent); }
.md-body h2 { font-size: 1.15rem; border-bottom: 1px solid var(--border); padding-bottom: 0.25rem; }
.md-body h3 { font-size: 1.05rem; color: #b8c5d6; }
.md-body p { margin-bottom: 0.85em; }
.md-body ul, .md-body ol { margin: 0.6em 0 0.85em 1.35rem; }
.md-body li { margin-bottom: 0.35em; }
.md-body code {
  background: var(--surface2);
  padding: 0.12em 0.35em;
  border-radius: 4px;
  font-size: 0.88em;
}
.md-body pre {
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1em 0;
  font-size: 0.85rem;
}
.md-body pre code { background: none; padding: 0; }
.md-body blockquote {
  border-left: 3px solid var(--accent-dim);
  margin: 1em 0;
  padding-left: 1rem;
  color: var(--muted);
}
.md-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  font-size: 0.88rem;
}
.md-body th, .md-body td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.65rem;
  text-align: left;
}
.md-body th { background: var(--surface2); color: var(--accent); }
.md-body tr:nth-child(even) { background: rgba(255,255,255,0.03); }
.md-body hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }
.md-body a { word-break: break-word; }

@media (max-width: 600px) {
  .site-header { padding: 0.75rem 1rem; }
  .container { padding: 1rem; }
}