:root {
  color-scheme: light dark;
  --bg: #f3f5f8;
  --bg-panel: #ffffff;
  --bg-panel-alt: #eef1f5;
  --text: #10151c;
  --text-dim: #5b6472;
  --border: #dde2e8;
  --accent: #2563eb;
  --ok: #16a34a;
  --warn: #d97706;
  --bad: #dc2626;
  --sim: #7c3aed;
  --shadow: 0 1px 2px rgba(16, 21, 28, 0.06), 0 8px 24px rgba(16, 21, 28, 0.05);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0e13;
    --bg-panel: #131922;
    --bg-panel-alt: #1a212c;
    --text: #e8ecf1;
    --text-dim: #8a94a3;
    --border: #232b38;
    --accent: #60a5fa;
    --ok: #4ade80;
    --warn: #fbbf24;
    --bad: #f87171;
    --sim: #c084fc;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.4;
}

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

header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}

header.topbar h1 {
  font-size: 1.05rem;
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}

nav.tabs { display: flex; gap: 0.4rem; flex-wrap: wrap; }

nav.tabs a {
  color: var(--text-dim);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
}

nav.tabs a.active, nav.tabs a:hover {
  background: var(--bg-panel-alt);
  color: var(--text);
  text-decoration: none;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.panel h2 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 0 0 0.7rem;
  font-weight: 700;
}

.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  justify-content: space-between;
}

.hero-value {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.hero-value .num {
  font-family: var(--mono);
  font-size: clamp(3.2rem, 12vw, 5.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.hero-value .unit {
  font-size: 1.4rem;
  color: var(--text-dim);
  font-weight: 600;
}

.hero-meta { display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-end; }

.badges { display: flex; gap: 0.4rem; flex-wrap: wrap; justify-content: flex-end; }

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge-normal { background: rgba(22, 163, 74, 0.13); color: var(--ok); }
.badge-event { background: rgba(220, 38, 38, 0.14); color: var(--bad); animation: pulse 1.4s ease-in-out infinite; }
.badge-noaudio { background: rgba(217, 119, 6, 0.15); color: var(--warn); }
.badge-sim { background: rgba(124, 58, 237, 0.15); color: var(--sim); }
.badge-uncalibrated { background: rgba(217, 119, 6, 0.15); color: var(--warn); }
.badge-calibrated { background: rgba(22, 163, 74, 0.13); color: var(--ok); }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.55; } }

.threshold-line { font-size: 0.85rem; color: var(--text-dim); }
.threshold-line strong { color: var(--text); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; }
@media (max-width: 720px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

canvas#chart { width: 100%; height: 220px; display: block; }

.chart-controls { display: flex; gap: 0.4rem; margin-bottom: 0.7rem; }
.chart-controls button {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg-panel-alt);
  color: var(--text-dim);
  cursor: pointer;
}
.chart-controls button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.stat-tile {
  background: var(--bg-panel-alt);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
}
.stat-tile .label { font-size: 0.72rem; color: var(--text-dim); font-weight: 600; }
.stat-tile .value { font-family: var(--mono); font-size: 1.3rem; font-weight: 700; }

.aircraft-card {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}
.aircraft-card:last-child { border-bottom: none; }
.aircraft-card .callsign { font-family: var(--mono); font-weight: 700; font-size: 1.05rem; }
.aircraft-card .type { color: var(--text-dim); font-size: 0.85rem; }
.aircraft-card .metrics { text-align: right; font-size: 0.85rem; color: var(--text-dim); }
.aircraft-card .metrics div { font-variant-numeric: tabular-nums; }

.empty-state { color: var(--text-dim); font-size: 0.9rem; padding: 0.5rem 0; }

table.data-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
table.data-table th, table.data-table td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
table.data-table th { color: var(--text-dim); font-weight: 600; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.03em; }
table.data-table tbody tr { cursor: pointer; }
table.data-table tbody tr:hover { background: var(--bg-panel-alt); }
.table-scroll { overflow-x: auto; }

.confidence { font-weight: 700; font-size: 0.78rem; }
.confidence-HIGH { color: var(--ok); }
.confidence-MEDIUM { color: var(--accent); }
.confidence-LOW { color: var(--text-dim); }
.confidence-AMBIGUOUS { color: var(--warn); }
.confidence-UNKNOWN { color: var(--text-dim); }

.kv-list { display: grid; grid-template-columns: auto 1fr; gap: 0.35rem 1rem; font-size: 0.9rem; }
.kv-list dt { color: var(--text-dim); }
.kv-list dd { margin: 0; font-family: var(--mono); }

.back-link { font-size: 0.85rem; }

footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.78rem;
  padding: 1.5rem 1rem 2.5rem;
}

footer p { margin: 0.3rem 0; }

footer .promo {
  color: var(--text-dim);
  opacity: 0.85;
}

footer .promo a { color: var(--accent); font-weight: 600; }