* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0a0e14;
  --bg-panel: #111620;
  --bg-header: #0d1117;
  --border: #1c2333;
  --text: #d4d8e0;
  --text-dim: #6b7280;
  --text-bright: #ffffff;
  --green: #00c853;
  --red: #ff1744;
  --blue: #2196f3;
  --yellow: #ffc107;
  --cyan: #00e5ff;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

html, body {
  height: 100%;
  background: var(--bg-primary);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 13px;
  overflow: hidden;
}

/* ── Header ─────────────────────────────────── */

#header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 8px 16px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  height: 44px;
  flex-shrink: 0;
}

.header-section {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-label {
  color: var(--text-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.header-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-bright);
}

.header-countdown {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--yellow);
  min-width: 40px;
}

.header-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.header-badge {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.green { color: var(--green); }
.red { color: var(--red); }

/* ── Status Dots ────────────────────────────── */

.status-section {
  margin-left: auto;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--red);
  transition: background 0.3s;
}

.status-dot.connected {
  background: var(--green);
}

/* ── Main Grid ──────────────────────────────── */

#grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 2fr 1.2fr 1.2fr auto;
  grid-template-areas:
    "btc btc"
    "poly-odds kalshi-odds"
    "poly-depth kalshi-depth"
    "info info";
  gap: 2px;
  height: calc(100vh - 44px);
  padding: 2px;
}

#btc-panel { grid-area: btc; }
#poly-odds-panel { grid-area: poly-odds; }
#kalshi-odds-panel { grid-area: kalshi-odds; }
#poly-depth-panel { grid-area: poly-depth; }
#kalshi-depth-panel { grid-area: kalshi-depth; }
#info-panel { grid-area: info; }

/* ── Panels ─────────────────────────────────── */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-header h2 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.panel-info {
  display: flex;
  gap: 12px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
}

/* ── Charts ─────────────────────────────────── */

.chart-container {
  flex: 1;
  min-height: 0;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Info Footer ────────────────────────────── */

#info-panel {
  padding: 8px 16px;
}

.info-grid {
  display: flex;
  gap: 32px;
  align-items: center;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-bright);
}

/* ── Signal Panel ──────────────────────────── */

.signal-summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  height: 40px;
}

.signal-indicator {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 1px;
  min-width: 50px;
  text-align: center;
}

.signal-buy {
  background: rgba(0, 200, 83, 0.2);
  color: var(--green);
  border: 1px solid rgba(0, 200, 83, 0.4);
}

.signal-sell {
  background: rgba(255, 23, 68, 0.2);
  color: var(--red);
  border: 1px solid rgba(255, 23, 68, 0.4);
}

.signal-hold {
  background: rgba(107, 114, 128, 0.15);
  color: var(--text-dim);
  border: 1px solid rgba(107, 114, 128, 0.3);
}

.signal-metrics {
  display: flex;
  gap: 16px;
  align-items: center;
  flex: 1;
}

.signal-metric {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.signal-metric-label {
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.signal-metric-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-bright);
}

.book-imbalance-bar {
  width: 60px;
  height: 8px;
  background: rgba(107, 114, 128, 0.2);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 2px;
}

.book-imbalance-fill {
  height: 100%;
  width: 50%;
  border-radius: 4px;
  transition: width 0.3s ease, background 0.3s ease;
}

.yellow { color: var(--yellow); }

/* ── Transitions ────────────────────────────── */

.flash-green {
  animation: flashGreen 0.3s ease-out;
}
.flash-red {
  animation: flashRed 0.3s ease-out;
}

@keyframes flashGreen {
  0% { color: var(--green); }
  100% { color: var(--text-bright); }
}
@keyframes flashRed {
  0% { color: var(--red); }
  100% { color: var(--text-bright); }
}

/* ── Responsive ─────────────────────────────── */

@media (max-width: 900px) {
  #grid {
    grid-template-columns: 1fr;
    grid-template-rows: 1.5fr 1fr 1fr 1fr 1fr auto;
    grid-template-areas:
      "btc"
      "poly-odds"
      "kalshi-odds"
      "poly-depth"
      "kalshi-depth"
      "info";
  }

  #header {
    flex-wrap: wrap;
    height: auto;
    gap: 8px;
  }

  .info-grid {
    flex-wrap: wrap;
    gap: 16px;
  }
}