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

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --border: #1a1a2e;
  --text: #c8c8d4;
  --text-dim: #555566;
  --accent: #00ff41;
  --accent-dim: #00ff4130;
  --danger: #ff3333;
  --warning: #ffaa00;
  --mono: 'Courier New', 'Consolas', monospace;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
}

/* Views */
.view { display: none; }
.view.active { display: block; }

/* Header */
.header {
  text-align: center;
  margin: 20px 0 24px;
}

.title {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--accent);
  letter-spacing: 0.15em;
  line-height: 1.2;
  text-shadow: 0 0 20px var(--accent-dim);
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.3em;
  margin-top: 4px;
}

/* Sections */
.section {
  margin-bottom: 20px;
}

.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

/* Buttons */
.btn-group {
  display: flex;
  gap: 6px;
}

.btn {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 0.8rem;
  cursor: pointer;
  flex: 1;
  text-align: center;
  transition: all 0.15s;
}

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

.btn.selected {
  border-color: var(--accent);
  color: var(--accent);
  background: #00ff4108;
  box-shadow: 0 0 8px var(--accent-dim);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: bold;
  letter-spacing: 0.1em;
  padding: 14px;
  width: 100%;
  margin-top: 8px;
}

.btn-primary:hover {
  background: #33ff66;
  color: var(--bg);
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.btn-row .btn { flex: 1; }

/* Slider */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border);
  outline: none;
  border-radius: 2px;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-dim);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* Info box */
.info-box {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 12px;
  font-size: 0.8rem;
  line-height: 1.5;
}

/* Exercise list (preview) */
.exercise-list {
  margin: 8px 0;
}

.exercise-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

.exercise-item.rest {
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 6px 12px;
}

.exercise-name {
  flex: 1;
}

.exercise-duration {
  color: var(--accent);
  font-size: 0.8rem;
  margin-left: 12px;
}

.exercise-desc {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.exercise-category {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-right: 8px;
}

/* Timer */
.timer-phase {
  text-align: center;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  margin-top: 30px;
}

.timer-exercise {
  text-align: center;
  font-size: 1.6rem;
  font-weight: bold;
  color: var(--accent);
  margin: 12px 0 4px;
  text-shadow: 0 0 20px var(--accent-dim);
}

.timer-description {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 20px;
  min-height: 1.2em;
}

.timer-display {
  text-align: center;
  font-size: 4rem;
  font-weight: bold;
  color: var(--text);
  margin: 20px 0;
  letter-spacing: 0.05em;
}

.timer-progress-wrap {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 0 0 16px;
  overflow: hidden;
}

.timer-progress {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.3s linear;
  box-shadow: 0 0 8px var(--accent-dim);
}

.timer-meta {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

/* Timer states */
.timer-exercise.rest-phase {
  color: var(--text-dim);
  text-shadow: none;
}

.timer-exercise.switch-phase {
  color: var(--warning);
  font-size: 1.2rem;
  text-shadow: 0 0 15px #ffaa0030;
}

.timer-display.countdown {
  color: var(--danger);
  text-shadow: 0 0 20px #ff333340;
}

/* Complete */
#view-complete .header {
  margin-top: 60px;
}

#view-complete .title {
  font-size: 2rem;
}

#view-complete .info-box {
  margin: 20px 0;
  text-align: center;
  line-height: 2;
}