/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg-dark: #0a0a0f;
  --bg-card: rgba(20, 20, 35, 0.85);
  --border-subtle: rgba(99, 102, 241, 0.15);
  --border-active: rgba(99, 102, 241, 0.45);
  --text-main: #e2e8f0;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.35);
  --success: #22c55e;
  --clamp: #f43f5e;
  --phase: #a78bfa;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-8: 32px;
  --space-13: 48px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
}

/* ── Reset & base ──────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg-dark);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* ── Grid overlay ──────────────────────────────────────────── */
.grid-overlay {
  position: fixed;
  inset: 0;
  background-image:
      linear-gradient(rgba(99, 102, 241, 0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(99, 102, 241, 0.04) 1px, transparent 1px);
  background-size: 42px 42px;
  pointer-events: none;
  z-index: 0;
}

/* ── Scene ─────────────────────────────────────────────────── */
.sweep-scene {
  position: relative;
  z-index: 1;
  width: min(90vw, 620px);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}

/* ── Header ────────────────────────────────────────────────── */
.sweep-header { margin-bottom: var(--space-2); }

.sweep-title {
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -1.5px;
  background: linear-gradient(135deg, var(--text-main), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sweep-subtitle {
  margin-top: var(--space-1);
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.45;
}

/* ── Stage ─────────────────────────────────────────────────── */
.sweep-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 340px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  box-shadow: 0 0 40px var(--accent-glow);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.sweep-stage.active {
  border-color: var(--border-active);
  box-shadow: 0 0 60px var(--accent-glow);
}

#sweepCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Clamp indicator ───────────────────────────────────────── */
.clamp-indicator {
  position: absolute;
  left: 0;
  right: 0;
  top: 35%;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 2;
}

.clamp-line {
  width: 100%;
  height: 1px;
  background: var(--clamp);
  opacity: 0.4;
  position: absolute;
  transition: opacity 0.25s ease;
}

.clamp-label {
  position: relative;
  z-index: 3;
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--clamp);
  background: var(--bg-dark);
  padding: 2px 8px;
  border-radius: 3px;
  opacity: 0.7;
}

.sweep-stage.active .clamp-line { opacity: 0.7; }
.sweep-stage.active .clamp-label { opacity: 1; }

/* ── Phase display ─────────────────────────────────────────── */
.phase-display {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  font-size: 0.7rem;
  color: var(--phase);
  text-align: right;
  z-index: 3;
  opacity: 0.7;
}

.phase-value {
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  display: block;
}

.phase-unit {
  display: block;
  font-size: 0.55rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.6;
}

/* ── Controls ──────────────────────────────────────────────── */
.sweep-controls {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.sweep-btn {
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: #fff;
  border: none;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 2px 16px rgba(99, 102, 241, 0.25);
  letter-spacing: 0.02em;
}

.sweep-btn:hover {
  transform: scale(1.04);
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.4);
}

.sweep-btn:active {
  transform: scale(0.96);
}

.sweep-btn:disabled {
  opacity: 0.4;
  cursor: default;
  transform: none;
}

.mute-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 1.1rem;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mute-btn:hover {
  border-color: var(--border-active);
  color: var(--text-main);
}

.mute-btn.muted {
  color: var(--clamp);
  border-color: rgba(244, 63, 94, 0.4);
}

/* ── Status ─────────────────────────────────────────────────── */
.sweep-status {
  font-size: 0.78rem;
  color: var(--text-muted);
  min-height: 1.2em;
  transition: color 0.3s ease;
}

.sweep-status.success { color: var(--success); }
.sweep-status.clamped { color: var(--clamp); }
.sweep-status.running { color: var(--phase); }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 600px) {
  .sweep-scene {
    gap: var(--space-4);
    width: 94vw;
  }

  .sweep-stage {
    max-height: 220px;
  }

  .sweep-title {
    letter-spacing: -0.8px;
  }

  .sweep-subtitle {
    font-size: 0.78rem;
  }

  .phase-display {
    top: var(--space-2);
    right: var(--space-2);
  }

  .phase-value {
    font-size: 0.75rem;
  }
}