/* Phase 2b — shared styles (light theme · 2026-08-26) */
:root {
  --bg: #fafafa;
  --card: #ffffff;
  --border: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent2: #ec4899;
  --highlight: #fde047;
  --red: #dc2626;
  --green: #16a34a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "SF Mono", Menlo, monospace;
  line-height: 1.7;
  padding: 2rem 1rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* === TOP NAV === */
.p2b-nav {
  display: flex;
  gap: 1.2rem;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  flex-wrap: wrap;
}
.p2b-nav .brand { color: var(--accent); font-weight: 700; margin-right: 0.6rem; }
.p2b-nav a {
  color: var(--muted); text-decoration: none;
  padding: 0.3rem 0.7rem; border-radius: 6px;
  transition: all 0.2s;
}
.p2b-nav a:hover { color: var(--accent); background: var(--card); }
.p2b-nav a.active {
  color: var(--accent); background: var(--card);
  border: 1px solid var(--accent);
}
.p2b-nav .round-tag {
  margin-left: auto; color: var(--muted);
  font-size: 0.78rem; padding: 0.25rem 0.55rem;
  border: 1px dashed var(--border); border-radius: 4px;
}

/* === HEADINGS === */
h1 {
  font-size: 2.2rem; margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
h2 {
  font-size: 1.45rem; margin: 2rem 0 0.8rem; color: var(--accent);
  border-bottom: 1px solid var(--border); padding-bottom: 0.4rem;
}
h3 { font-size: 1.1rem; margin: 1.5rem 0 0.6rem; color: var(--accent2); }
.subtitle { color: var(--muted); margin-bottom: 1.5rem; font-size: 1rem; }
.meta { color: var(--muted); font-size: 0.85rem; margin-bottom: 1rem; }
.meta span { margin-right: 1rem; }

/* === CARDS === */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem;
  margin-bottom: 1rem;
  transition: all 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.card h3 { margin-top: 0; }
.card .badge {
  display: inline-block; padding: 0.15rem 0.5rem; border-radius: 4px;
  font-size: 0.75rem; margin-right: 0.4rem;
}
.badge-html { background: rgba(236, 72, 153, 0.12); color: var(--accent2); border: 1px solid var(--accent2); }
.badge-py   { background: rgba(37, 99, 235, 0.12); color: var(--accent); border: 1px solid var(--accent); }
.badge-identical { background: rgba(22, 163, 74, 0.12); color: var(--green); border: 1px solid var(--green); }

/* === A/B BUTTONS (per-card, side-by-side) === */
.ab-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 1rem;
}
.ab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  transition: all 0.2s;
}
.ab-btn-a {
  color: var(--accent);
  border: 1.5px solid rgba(37, 99, 235, 0.35);
  background: rgba(37, 99, 235, 0.04);
}
.ab-btn-a:hover {
  background: rgba(37, 99, 235, 0.12);
  border-color: var(--accent);
}
.ab-btn-b {
  color: var(--accent2);
  border: 1.5px solid rgba(236, 72, 153, 0.35);
  background: rgba(236, 72, 153, 0.04);
}
.ab-btn-b:hover {
  background: rgba(236, 72, 153, 0.12);
  border-color: var(--accent2);
}

/* === GRID for index cards === */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.grid .card { margin-bottom: 0; }

/* === TABLES === */
table.perf {
  width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.92rem;
}
table.perf th, table.perf td {
  text-align: left; padding: 0.55rem 0.7rem; border: 1px solid var(--border);
}
table.perf th { background: var(--card); color: var(--accent); font-weight: 600; }
table.perf tr:hover td { background: rgba(37, 99, 235, 0.04); }
.a-col { color: var(--accent); }
.b-col { color: var(--accent2); }
.a-bg { background: rgba(37, 99, 235, 0.06); }
.b-bg { background: rgba(236, 72, 153, 0.06); }

/* === CODE BLOCKS === */
pre.code {
  background: #f3f4f6;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0.5rem 0;
  color: #1f2937;
}
pre.code .kw { color: #c586c0; }
pre.code .str { color: #ce9178; }
pre.code .com { color: #6a9955; font-style: italic; }
pre.code .num { color: #b5cea8; }

/* === HEADLINE BOX (verdict) === */
.headline {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(236, 72, 153, 0.06));
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}
.headline .verdict {
  font-size: 1.4rem; font-weight: 700; color: var(--green); margin-bottom: 0.5rem;
}
.headline p { margin-bottom: 0.7rem; }

/* === CAVEATS === */
.caveats {
  background: var(--card);
  border-left: 4px solid var(--accent2);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}
.caveats h3 { margin-top: 0; color: var(--accent2); }
.caveats ul { margin-left: 1.2rem; }
.caveats li { color: var(--muted); margin-bottom: 0.4rem; }

/* === SUMMARY STATS === */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
}
.stat-card .label { font-size: 0.78rem; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.stat-card .value { font-size: 1.6rem; font-weight: 700; margin-top: 0.3rem; }
.stat-card .sub { font-size: 0.78rem; color: var(--muted); margin-top: 0.2rem; }

/* === FOOTER === */
.p2b-footer {
  color: var(--muted);
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
}

/* === A/B COMPARE (Python side-by-side) === */
.ab-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}
.ab-col {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  scroll-margin-top: 1rem;
}
.ab-col-a { border-top: 4px solid var(--accent); }
.ab-col-b { border-top: 4px solid var(--accent2); }
.ab-col-head {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.ab-col-head .muted { color: var(--muted); font-size: 0.78rem; }
.badge-side {
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 600;
}
.badge-side-a {
  background: rgba(37, 99, 235, 0.12);
  color: var(--accent);
  border: 1px solid var(--accent);
}
.badge-side-b {
  background: rgba(236, 72, 153, 0.12);
  color: var(--accent2);
  border: 1px solid var(--accent2);
}
.ab-col pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.55;
  background: #f8f9fa;
  color: #1f2937;
  font-family: "SF Mono", Menlo, Monaco, "Courier New", monospace;
}
.ab-col pre .kw { color: #c586c0; font-weight: 600; }
.ab-col pre .str { color: #ce9178; }
.ab-col pre .com { color: #6a9955; font-style: italic; }
.ab-col pre .num { color: #b5cea8; }