/* QTL / Quantum Transition Labs theme — matches qtransitionlabs.com tokens */

:root {
  --bg-base: #0d1117;
  --bg-elevated: #161b22;
  --bg-surface: #1f2937;
  --text-primary: #f0f6fc;
  --text-body: #c9d1d9;
  --text-muted: #8b949e;
  --border: #30363d;
  --accent: #38bdf8;
  --accent-hover: #60a5fa;
  --accent-glow: rgba(56, 189, 248, 0.45);
  --accent-dim: rgba(56, 189, 248, 0.14);
  --gold: #e8b020;
  --coral: #f87171;
  --ok: #3ecf8e;
  --fail: #ff6b6b;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  font-family: "Inter", system-ui, sans-serif;
  color: var(--text-body);
  background:
    radial-gradient(ellipse 90% 55% at 50% -15%, rgba(56, 189, 248, 0.08), transparent),
    var(--bg-base);
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
code, pre, textarea { font-family: "JetBrains Mono", monospace; }

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.hero__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.hero__badge {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero__link {
  font-size: 0.88rem;
  font-weight: 600;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.1;
  color: var(--text-primary);
  font-weight: 800;
}

.hero__lead {
  max-width: 720px;
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 0 0 1.5rem;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

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

.stat--accent {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.08);
}

.stat__value {
  display: block;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--accent);
}

.stat__label {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.alert {
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.28);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  color: #fecaca;
  line-height: 1.5;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 2px);
  padding: 1.35rem;
  margin-top: 1.25rem;
  box-shadow: var(--shadow);
}

.panel--split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.panel__head h2 {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.panel__head p {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.flow__node {
  min-width: 88px;
  text-align: center;
  padding: 0.75rem;
  border-radius: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-primary);
}

.flow__node--accent {
  border-color: rgba(56, 189, 248, 0.45);
  background: var(--accent-dim);
}

.flow__arrow { color: var(--text-muted); font-size: 0.85rem; }

.field span {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

textarea {
  width: 100%;
  background: var(--bg-base);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  resize: vertical;
}

.btn-row { display: flex; gap: 0.65rem; margin: 0.85rem 0 1rem; flex-wrap: wrap; }

.btn {
  border: 0;
  border-radius: 999px;
  padding: 0.65rem 1.15rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn--primary {
  background: var(--accent);
  color: #0f172a;
  box-shadow: 0 0 18px var(--accent-glow);
}

.btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
}

.result {
  background: var(--bg-surface);
  border-radius: 10px;
  padding: 0.75rem;
}

.result__label {
  display: block;
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-bottom: 0.25rem;
}

.result__value { font-weight: 600; color: var(--text-primary); }
.result__value.ok { color: var(--ok); }
.result__value.fail { color: var(--fail); }
.muted { color: var(--text-muted); }

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.controls--tps {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

@media (max-width: 1100px) {
  .controls--tps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.controls label {
  display: block;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.controls output {
  float: right;
  color: var(--accent);
  font-weight: 700;
}

.controls input[type="range"] {
  width: 100%;
  margin-top: 0.45rem;
  accent-color: var(--accent);
}

.tps-highlight {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

@media (max-width: 1100px) {
  .tps-highlight {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.tps-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

.tps-card--best {
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--accent-dim);
}

.tps-card--warn {
  border-color: rgba(248, 113, 113, 0.35);
}

.tps-card__label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.tps-card__value {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.tps-card__meta {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.chart-card {
  background: var(--bg-surface);
  border-radius: 12px;
  padding: 0.85rem;
}

.chart-card--full { margin-top: 0.5rem; }

.chart-card h3 {
  margin: 0 0 0.5rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 500;
}

.table-wrap { overflow-x: auto; margin-top: 1rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

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

th { color: var(--text-muted); font-weight: 500; }

tr.highlight td {
  background: var(--accent-dim);
  font-weight: 600;
  color: var(--text-primary);
}

.stack-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.stack-list li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.5;
}

.pill {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 0.35rem;
}

.pill--gold { background: rgba(232, 176, 32, 0.18); color: var(--gold); }
.pill--teal { background: var(--accent-dim); color: var(--accent); }
.pill--muted { background: rgba(255,255,255,0.06); color: var(--text-muted); }

.fine-print {
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-top: 0.75rem;
}

.footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 960px) {
  .stat-row, .result-grid, .controls, .chart-grid, .panel--split, .tps-highlight {
    grid-template-columns: 1fr;
  }
}

.explain {
  background: rgba(56, 189, 248, 0.06);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-body);
}

.explain summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--accent);
  list-style: none;
}

.explain summary::-webkit-details-marker { display: none; }

.explain ul {
  margin: 0.5rem 0 0 1.1rem;
  padding: 0;
}

.explain li { margin-bottom: 0.35rem; }

.explain code {
  font-size: 0.82em;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.tps-breakdown td, .tps-breakdown th {
  font-size: 0.82rem;
}

.tag-bottleneck {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.tag-bottleneck--bw {
  background: rgba(232, 176, 32, 0.15);
  color: var(--gold);
}

.tag-bottleneck--cpu {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
}

.chart-legend-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0.35rem 0 0.75rem;
}

.formula-block {
  margin-top: 0.85rem;
}

.formula-block + .formula-block {
  margin-top: 0.5rem;
}

.formula-block__title {
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.35rem;
}

.formula {
  margin: 0;
  padding: 0.7rem 0.85rem;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--text-primary);
  overflow-x: auto;
  white-space: pre-wrap;
}

.theme-toggle-btn {
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-primary);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Light mode — matches qtransitionlabs.com tokens */
body.light-mode {
  --bg-base: #ffffff;
  --bg-elevated: #f6f8fa;
  --bg-surface: #ffffff;
  --text-primary: #1a1f36;
  --text-body: #374151;
  --text-muted: #4b5563;
  --border: #d0d7de;
  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.25);
  --accent-dim: rgba(2, 132, 199, 0.1);
  --gold: #b45309;
  --coral: #dc2626;
  --ok: #059669;
  --fail: #dc2626;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
  color-scheme: light;
  background:
    radial-gradient(ellipse 90% 55% at 50% -15%, rgba(59, 130, 246, 0.06), transparent),
    var(--bg-base);
}

body.light-mode .alert {
  background: rgba(220, 38, 38, 0.06);
  border-color: rgba(220, 38, 38, 0.2);
  color: #991b1b;
}

body.light-mode .btn--primary {
  color: #ffffff;
}

body.light-mode .explain {
  background: rgba(2, 132, 199, 0.06);
  border-color: rgba(2, 132, 199, 0.18);
}

body.light-mode .explain code,
body.light-mode .formula {
  background: rgba(15, 23, 42, 0.04);
}

body.light-mode .tag-bottleneck {
  background: rgba(15, 23, 42, 0.06);
}

body.light-mode .tag-bottleneck--bw {
  background: rgba(180, 83, 9, 0.12);
}

body.light-mode .tag-bottleneck--cpu {
  background: rgba(2, 132, 199, 0.12);
}

body.light-mode th {
  background: var(--bg-elevated);
}

body.light-mode tr.highlight td {
  background: var(--accent-dim);
}