:root {
  --bg: #0a0a1a;
  --bg-card: #12122a;
  --primary: #6c63ff;
  --primary-glow: rgba(108, 99, 255, 0.3);
  --accent: #00d4aa;
  --accent-glow: rgba(0, 212, 170, 0.3);
  --text: #e0e0f0;
  --text-dim: #8888aa;
  --danger: #ff6b6b;
  --warning: #ffd93d;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Header */
.header { text-align: center; padding: 30px 20px 10px; }
.header h1 {
  font-size: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}
.header p { color: var(--text-dim); font-size: 0.95rem; }

/* Difficulty Selector */
.difficulty-selector {
  display: flex; justify-content: center; gap: 8px; margin-top: 14px;
}
.diff-btn {
  padding: 6px 20px; border-radius: 20px; border: 1px solid rgba(108,99,255,0.2);
  background: rgba(255,255,255,0.04); color: var(--text-dim);
  font-size: 0.85rem; cursor: pointer; transition: all 0.2s; font-weight: 500;
}
.diff-btn:hover { border-color: var(--primary); color: var(--text); }
.diff-btn.active[data-diff="1"] {
  background: rgba(0,212,170,0.15); border-color: var(--accent); color: var(--accent);
}
.diff-btn.active[data-diff="2"] {
  background: rgba(108,99,255,0.15); border-color: var(--primary); color: var(--primary);
}
.diff-btn.active[data-diff="3"] {
  background: rgba(255,107,107,0.15); border-color: var(--danger); color: var(--danger);
}

/* Menu */
.menu {
  padding: 16px 24px; max-width: 960px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 12px;
}

/* Category sections */
.category-section { border-radius: 14px; overflow: hidden; }
.category-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; background: var(--bg-card);
  border: 1px solid rgba(108,99,255,0.15); border-radius: 14px;
  cursor: pointer; transition: all 0.2s; user-select: none;
}
.category-header:hover { border-color: var(--primary); background: rgba(18,18,42,0.8); }
.category-header-left { display: flex; align-items: center; gap: 12px; }
.category-icon { font-size: 1.5rem; }
.category-name { font-size: 1.1rem; font-weight: 600; margin: 0; }
.category-count {
  padding: 2px 10px; border-radius: 12px; font-size: 0.78rem;
  background: rgba(108,99,255,0.15); color: var(--primary);
}
.category-toggle {
  font-size: 0.9rem; color: var(--text-dim);
  transition: transform 0.3s ease;
}
.category-section.expanded .category-toggle { transform: rotate(180deg); }
.category-exercises {
  display: flex; flex-wrap: wrap; gap: 10px;
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height 0.4s ease, padding 0.3s ease, opacity 0.3s ease;
  padding: 0;
}
.category-section.expanded .category-exercises {
  max-height: 3000px; padding: 12px 0; opacity: 1;
}
.menu-card {
  background: var(--bg-card);
  border: 1px solid rgba(108,99,255,0.15);
  border-radius: 12px; padding: 12px 16px;
  cursor: pointer; transition: all 0.3s;
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 10px;
  flex: 0 0 auto;
}
.menu-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0; transition: opacity 0.3s;
}
.menu-card:hover {
  border-color: var(--primary); transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--primary-glow);
}
.menu-card:hover::before { opacity: 1; }
.menu-card .icon { font-size: 1.4rem; flex-shrink: 0; }
.menu-card h3 { font-size: 0.9rem; color: var(--text); white-space: nowrap; }
.menu-card p { display: none; }
.menu-card .tag {
  display: inline-block; padding: 2px 8px;
  border-radius: 20px; font-size: 0.68rem;
  background: rgba(108,99,255,0.15); color: var(--primary);
  white-space: nowrap;
}

/* Exercise View */
.exercise-view {
  display: none; flex-direction: column; align-items: center;
  height: 100vh; position: relative;
}
.exercise-view.active { display: flex; }
.exercise-header {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: 16px 24px;
  background: rgba(18,18,42,0.95); backdrop-filter: blur(10px); z-index: 10;
}
.exercise-title { font-size: 1.1rem; font-weight: 600; }
.exercise-info { font-size: 0.85rem; color: var(--text-dim); }

.btn {
  padding: 8px 20px; border: none; border-radius: 10px;
  font-size: 0.9rem; cursor: pointer; transition: all 0.2s; font-weight: 500;
}
.btn-back { background: rgba(255,255,255,0.08); color: var(--text); }
.btn-back:hover { background: rgba(255,255,255,0.15); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #5a52e0; }
.btn-accent { background: var(--accent); color: #0a0a1a; }
.btn-accent:hover { background: #00b894; }

.canvas-container {
  flex: 1; width: 100%; display: flex; align-items: center;
  justify-content: center; position: relative; overflow: hidden;
}
canvas#exerciseCanvas { display: block; }

.settings-panel {
  position: absolute; top: 70px; right: 20px; background: var(--bg-card);
  border: 1px solid rgba(108,99,255,0.2); border-radius: 14px;
  padding: 20px; z-index: 20; min-width: 240px;
  display: none; box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}
.settings-panel.show { display: block; }
.settings-panel label {
  display: block; font-size: 0.85rem; color: var(--text-dim);
  margin-bottom: 4px; margin-top: 12px;
}
.settings-panel label:first-child { margin-top: 0; }
.settings-panel select, .settings-panel input[type="range"] {
  width: 100%; padding: 6px 10px; border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05); color: var(--text); font-size: 0.9rem;
}
.settings-panel input[type="range"] {
  -webkit-appearance: none; height: 6px;
  background: rgba(108,99,255,0.3); border: none; padding: 0; margin-top: 6px;
}
.settings-panel input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px;
  border-radius: 50%; background: var(--primary); cursor: pointer;
}
.speed-value { text-align: center; font-size: 0.85rem; color: var(--accent); margin-top: 4px; }

.timer-display {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  font-size: 1.4rem; font-weight: 600; color: var(--accent);
  font-variant-numeric: tabular-nums; z-index: 5;
}
.progress-bar {
  position: absolute; bottom: 0; left: 0; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.5s linear; z-index: 5;
}

/* Guided display */
.guided-display {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; height: 100%; gap: 24px; width: 100%;
}
.guided-timer {
  font-size: 5rem; font-weight: 700; font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.guided-phase { font-size: 1.3rem; color: var(--text-dim); }
.guided-instruction {
  font-size: 1.5rem; text-align: center; max-width: 500px; line-height: 1.6;
}
.guided-focus-dot {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 30px rgba(0,212,170,0.5), 0 0 60px rgba(0,212,170,0.2);
  animation: pulseFocus 2s ease-in-out infinite;
}
@keyframes pulseFocus {
  0%,100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}
.guided-far-icon {
  font-size: 4rem;
  animation: breathe 3s ease-in-out infinite;
}
@keyframes breathe {
  0%,100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.1); opacity: 1; }
}

/* Speed indicator */
.speed-indicator {
  position: absolute; top: 70px; left: 24px;
  font-size: 0.8rem; color: var(--text-dim); z-index: 5;
  display: flex; align-items: center; gap: 8px;
}
.speed-bar {
  width: 80px; height: 4px; background: rgba(255,255,255,0.08);
  border-radius: 2px; overflow: hidden;
}
.speed-bar-fill {
  height: 100%; border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.3s;
}
.phase-label {
  font-size: 0.72rem; padding: 2px 8px; border-radius: 10px;
  background: rgba(255,255,255,0.06);
}

/* Info button */
.info-btn {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.05); color: var(--text-dim);
  font-size: 0.75rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; z-index: 2; flex-shrink: 0;
}
.info-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Info Modal */
.info-modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10,10,26,0.85); backdrop-filter: blur(8px);
  z-index: 100; display: flex; align-items: center; justify-content: center;
  animation: fadeIn 0.2s;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.info-modal {
  background: var(--bg-card); border: 1px solid rgba(108,99,255,0.2);
  border-radius: 20px; padding: 32px; max-width: 520px; width: 90%;
  max-height: 85vh; overflow-y: auto; position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.info-modal-close {
  position: absolute; top: 16px; right: 16px; width: 32px; height: 32px;
  border-radius: 50%; border: none; background: rgba(255,255,255,0.08);
  color: var(--text); font-size: 1.1rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.info-modal-close:hover { background: rgba(255,255,255,0.15); }
.info-modal .info-icon { font-size: 2.5rem; margin-bottom: 12px; }
.info-modal h2 { font-size: 1.4rem; margin-bottom: 16px; }
.info-modal h3 {
  font-size: 0.95rem; color: var(--accent);
  margin-top: 18px; margin-bottom: 8px;
}
.info-modal p { font-size: 0.9rem; line-height: 1.7; color: var(--text-dim); }
.info-modal .benefit-list { list-style: none; padding: 0; margin: 8px 0; }
.info-modal .benefit-list li {
  padding: 6px 0 6px 24px; position: relative;
  font-size: 0.88rem; color: var(--text); line-height: 1.5;
}
.info-modal .benefit-list li::before {
  content: '\2726'; position: absolute; left: 0; color: var(--accent);
}
.info-modal .muscle-tag {
  display: inline-block; padding: 3px 10px; border-radius: 20px;
  font-size: 0.75rem; background: rgba(108,99,255,0.12);
  color: var(--primary); margin: 3px 4px 3px 0;
}
.info-modal .distance-badge {
  display: inline-block; padding: 5px 14px; border-radius: 12px;
  font-size: 0.85rem; background: rgba(0,212,170,0.12);
  color: var(--accent); margin-top: 4px;
}

/* Controls */
.controls-bar { display: flex; gap: 10px; align-items: center; }
.btn-icon {
  width: 38px; height: 38px; border-radius: 10px; border: none;
  background: rgba(255,255,255,0.08); color: var(--text);
  font-size: 1.2rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.btn-icon:hover { background: rgba(255,255,255,0.15); }

/* Countdown */
.countdown-overlay {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10,10,26,0.9);
  display: flex; align-items: center; justify-content: center;
  z-index: 30; flex-direction: column;
}
.countdown-overlay .count {
  font-size: 8rem; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: countPulse 1s ease-in-out;
}
.countdown-overlay .count-label { font-size: 1.2rem; color: var(--text-dim); margin-top: 10px; }
@keyframes countPulse {
  0% { transform: scale(0.5); opacity: 0; }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

/* Completion */
.completion-screen {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10,10,26,0.95);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  z-index: 30; gap: 20px;
}
.completion-screen .check { font-size: 4rem; margin-bottom: 10px; }
.completion-screen h2 {
  font-size: 1.8rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.completion-screen p { color: var(--text-dim); font-size: 1rem; }

/* Peripheral detection hit indicator */
.peripheral-hit {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  font-size: 1.5rem; color: var(--accent); font-weight: 700; z-index: 5;
  animation: hitFade 0.8s ease-out forwards;
}
@keyframes hitFade {
  0% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -80%) scale(1.3); }
}

/* Breathing circle for eyeRelaxation */
.breathing-circle {
  width: 120px; height: 120px; border-radius: 50%;
  background: radial-gradient(circle, rgba(108,99,255,0.3), rgba(0,212,170,0.1));
  border: 2px solid rgba(108,99,255,0.4);
  transition: all 0.3s ease;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; color: var(--text-dim);
}

/* Blink eye icon */
.blink-eye {
  font-size: 6rem; transition: transform 0.15s;
}
.blink-eye.closed { transform: scaleY(0.1); }

/* Schulte Table */
.schulte-grid {
  display: grid; gap: 4px;
  max-width: 90vmin; max-height: 90vmin;
}
.schulte-cell {
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  font-size: 1.5rem; font-weight: 700;
  cursor: pointer; transition: all 0.15s;
  aspect-ratio: 1;
  user-select: none;
}
.schulte-cell:hover { background: rgba(108,99,255,0.15); border-color: var(--primary); }
.schulte-cell.found {
  background: rgba(0,212,170,0.15); border-color: var(--accent);
  color: var(--accent); opacity: 0.5;
}
.schulte-cell.current-target {
  animation: pulseTarget 1s ease-in-out infinite;
}
@keyframes pulseTarget {
  0%,100% { box-shadow: none; }
  50% { box-shadow: 0 0 15px var(--primary-glow); }
}
.schulte-info {
  text-align: center; color: var(--text-dim); font-size: 0.9rem;
  margin-bottom: 16px;
}
.schulte-next {
  font-size: 1.2rem; color: var(--accent); font-weight: 600;
}

/* RSVP */
.rsvp-display {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; height: 100%; gap: 20px; width: 100%;
}
.rsvp-word {
  font-size: 3.5rem; font-weight: 700; letter-spacing: 2px;
  min-height: 60px; display: flex; align-items: center;
}
.rsvp-word .orp { color: var(--danger); }
.rsvp-fixation {
  width: 2px; height: 40px; background: rgba(255,255,255,0.15);
  position: absolute; left: 50%;
}
.rsvp-wpm {
  font-size: 1.1rem; color: var(--text-dim);
}

/* Tachistoscope */
.tachy-display {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; height: 100%; gap: 24px;
}
.tachy-flash {
  font-size: 4rem; font-weight: 700; min-height: 60px;
  display: flex; align-items: center; justify-content: center;
}
.tachy-info {
  font-size: 1rem; color: var(--text-dim);
}
.tachy-fixation {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); opacity: 0.5;
}

/* Eye-Hop */
.eyehop-container {
  width: 90%; max-width: 800px; padding: 40px 0;
}
.eyehop-line {
  display: flex; justify-content: space-between;
  margin-bottom: 24px; position: relative; min-height: 40px;
}
.eyehop-chunk {
  width: 45%; padding: 8px 16px;
  font-size: 1.1rem; line-height: 1.6;
  border-radius: 8px; transition: all 0.3s;
  color: var(--text-dim);
}
.eyehop-chunk.active {
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--text);
}
.eyehop-chunk .fixation-dot {
  display: inline-block; width: 6px; height: 6px;
  border-radius: 50%; background: var(--accent);
  vertical-align: middle; margin: 0 4px;
}

/* Responsive */
@media (max-width: 600px) {
  .menu { padding: 12px; gap: 10px; }
  .menu-card { padding: 10px 12px; }
  .menu-card h3 { font-size: 0.82rem; }
  .header h1 { font-size: 1.5rem; }
  .exercise-header { padding: 12px 16px; }
  .rsvp-word { font-size: 2.5rem; }
  .schulte-cell { font-size: 1.1rem; }
  .category-header { padding: 12px 16px; }
  .category-exercises { gap: 8px; }
}