:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --surface2: #0f3460;
  --accent: #e94560;
  --accent2: #4e79a7;
  --text: #eee;
  --text-dim: #999;
  --success: #59a14f;
  --warning: #f28e2b;
  --danger: #e15759;
  --border: #333;
  --mono: "SF Mono", "Cascadia Code", "Fira Code", monospace;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Connection Bar ──────────────────────────────────────────── */
.connection-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.connection-bar h1 {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
}

.spacer { flex: 1; }

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--danger);
  flex-shrink: 0;
}
.status-dot.connected { background: var(--success); }

.status-text { font-size: 13px; color: var(--text-dim); white-space: nowrap; }
.sys-info { font-size: 12px; color: var(--text-dim); display: flex; gap: 12px; }

.stream-group {
  display: flex; align-items: center; gap: 4px; font-size: 12px;
}
.stream-group input { width: 60px; }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent2); }
.btn-primary { background: var(--accent2); border-color: var(--accent2); }
.btn-primary:hover { opacity: 0.9; }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: white; }
.btn-accent { background: var(--accent); border-color: var(--accent); }
.btn-sm { padding: 2px 8px; font-size: 12px; }

/* ── Presets bar ──────────────────────────────────────────────── */
.presets-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  overflow-x: auto;
}
.presets-label { color: var(--text-dim); font-weight: 600; white-space: nowrap; }
.preset-btn {
  padding: 3px 10px;
  font-size: 11px;
  background: var(--bg);
  border-color: var(--accent2);
}
.preset-btn:hover { background: var(--accent2); }
.preset-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.preset-btn:disabled:hover { background: var(--bg); }

/* ── Main Layout: 3-column ───────────────────────────────────── */
.main-layout {
  display: grid;
  grid-template-columns: 460px 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  height: calc(100vh - 82px);
}

/* Pinout spans full left column */
.pinout-panel {
  grid-row: 1 / 3;
  grid-column: 1;
}

.panel {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-title {
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

/* ── Tab buttons ─────────────────────────────────────────────── */
.tab-btn {
  padding: 3px 10px;
  font-size: 11px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.tab-btn.active { color: var(--text); border-bottom-color: var(--accent2); }
.tab-btn:hover { color: var(--text); }

/* ── Pin Config Panel ────────────────────────────────────────── */
.panel-toolbar {
  display: flex; gap: 6px; margin-bottom: 8px; flex-wrap: wrap;
}
.pin-list { display: flex; flex-direction: column; gap: 6px; }
.pin-row {
  background: var(--surface);
  border-radius: 4px;
  padding: 8px;
  cursor: pointer;
}
.pin-row:hover { border: 1px solid var(--accent2); margin: -1px; }
.pin-header {
  display: flex; align-items: center; gap: 8px;
}
.pin-name { font-weight: 600; flex: 1; }
.pin-mode {
  font-size: 11px; padding: 2px 6px;
  background: var(--surface2); border-radius: 3px;
  font-family: var(--mono);
}
.pin-details {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-top: 4px; font-size: 12px; color: var(--text-dim);
}

/* ── Chart ────────────────────────────────────────────────────── */
.chart-body { padding: 0; }

/* uPlot canvas background */
.u-wrap { background: transparent !important; }
.chart-placeholder {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; color: var(--text-dim); font-size: 13px;
  text-align: center; pointer-events: none;
}
.chart-placeholder .placeholder-icon { font-size: 32px; opacity: 0.3; }
.chart-placeholder .placeholder-hint { font-size: 11px; opacity: 0.6; }

/* ── Event Log ───────────────────────────────────────────────── */
.log-controls {
  display: flex; gap: 6px; align-items: center;
  font-size: 12px; flex-wrap: wrap; margin-left: auto;
}
.log-controls select {
  padding: 3px 6px; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 3px;
}

.log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-family: var(--mono);
}
.log-table th {
  text-align: left;
  padding: 4px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  font-weight: normal;
  position: sticky;
  top: 0;
  background: var(--bg);
}
.log-table td {
  padding: 3px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.edge-rise { color: var(--success); }
.edge-fall { color: var(--danger); }
.mono { font-family: var(--mono); }

/* ── Output Control ──────────────────────────────────────────── */
.output-controls { display: flex; flex-direction: column; gap: 8px; }
.output-row {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); padding: 8px; border-radius: 4px;
  flex-wrap: wrap;
}
.output-label { font-weight: 600; min-width: 100px; }
.toggle-btn { min-width: 50px; }
.pulse-group { display: flex; gap: 4px; align-items: center; }
.pulse-dur { width: 60px; }
.pwm-group {
  display: flex; align-items: center; gap: 6px; flex: 1;
}
.pwm-slider { flex: 1; min-width: 80px; }
.pwm-value { font-family: var(--mono); min-width: 30px; text-align: right; }
.pwm-freq { width: 80px; }

/* ── Pinout Diagram ──────────────────────────────────────────── */
.pinout-body {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 8px;
}
.pinout-body svg {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.pin-group:hover circle:first-child {
  stroke: var(--accent);
  stroke-width: 2;
}

/* ── Inputs ───────────────────────────────────────────────────── */
input[type="number"], input[type="text"], select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 6px;
  font-size: 13px;
}
input[type="range"] {
  accent-color: var(--accent2);
}

/* ── Modal ────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  min-width: 320px;
  max-width: 400px;
}
.modal h3 { margin-bottom: 12px; }
.form-group { margin-bottom: 10px; }
.form-group label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.form-group select, .form-group input { width: 100%; }
.modal-buttons { display: flex; gap: 8px; justify-content: flex-end; margin-top: 16px; }

/* ── Warning ──────────────────────────────────────────────────── */
.warning { color: var(--warning); font-size: 12px; }

/* ── Toast ────────────────────────────────────────────────────── */
.toast-container {
  position: fixed; top: 12px; right: 12px; z-index: 200;
  display: flex; flex-direction: column; gap: 6px;
}
.toast {
  padding: 8px 14px; border-radius: 4px;
  font-size: 13px; animation: fadeIn 0.2s;
  cursor: pointer;
}
.toast-info { background: var(--accent2); }
.toast-error { background: var(--danger); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; } }

/* ── Race Timer ──────────────────────────────────────────────── */
.timing-pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #fff;
  margin-left: 6px;
  animation: pulse 1s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }

.empty { color: var(--text-dim); font-size: 13px; text-align: center; padding: 20px; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto 1fr 1fr;
  }
  .pinout-panel {
    grid-row: 1;
    grid-column: 1 / 3;
    max-height: 300px;
  }
}