:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #334155;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  padding: 16px;
  padding-bottom: env(safe-area-inset-bottom, 16px);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

h1 {
  font-size: 1.25rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 20px;
}

.tab {
  flex: 1;
  padding: 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.tab.active {
  background: var(--primary);
  color: var(--text);
}

/* Panels */
.panel { display: none; }
.panel.active { display: block; }

/* Timer Display */
.timer-display {
  font-size: 4rem;
  font-weight: 700;
  text-align: center;
  font-variant-numeric: tabular-nums;
  letter-spacing: -2px;
  margin: 20px 0;
}

.timer-label {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* Counters */
.counters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.counter-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.counter-card .label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.counter-card .value {
  font-size: 2.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.counter-card .value.reps { color: var(--primary); }
.counter-card .value.rounds { color: var(--success); }

/* Buttons */
.btn {
  display: block;
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary { background: var(--primary); color: var(--text); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: var(--text); }
.btn-success { background: var(--success); color: #000; }
.btn-warning { background: var(--warning); color: #000; }
.btn-surface { background: var(--surface); color: var(--text); }
.btn-surface:hover { background: var(--surface-hover); }

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.btn-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

/* Big Tap Zone */
.tap-zone {
  width: 100%;
  min-height: 120px;
  background: var(--surface);
  border: 2px dashed var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  margin-bottom: 12px;
  transition: all 0.1s;
}

.tap-zone:active {
  background: var(--primary);
  color: var(--text);
  transform: scale(0.97);
}

/* Form inputs */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.form-group select,
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--surface-hover);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font);
}

.form-group textarea {
  min-height: 80px;
  resize: vertical;
}

.form-group input[type="range"] {
  padding: 0;
  margin-top: 8px;
}

.range-value {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

/* Status messages */
.status {
  text-align: center;
  padding: 12px;
  border-radius: 8px;
  margin-top: 12px;
  font-size: 0.9rem;
}

.status.success { background: #166534; color: #bbf7d0; }
.status.error { background: #7f1d1d; color: #fecaca; }
.status.loading { background: #1e3a5f; color: #93c5fd; }

/* Mode selector */
.mode-selector {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border-radius: 8px;
  padding: 4px;
  margin-bottom: 16px;
}

.mode-btn {
  flex: 1;
  padding: 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
}

.mode-btn.active {
  background: var(--warning);
  color: #000;
}

/* Settings row */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 8px;
}

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

.settings-row input {
  width: 60px;
  padding: 6px 8px;
  border: 1px solid var(--surface-hover);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  text-align: center;
}

/* Config panel */
.config-url {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--surface-hover);
}