/* ==========================================================================
   AmbientFlow — Study Soundscapes & Lo-Fi Generator
   IAMGREATER.net Dark Mode & Cyber Aesthetic Design System
   ========================================================================== */

:root {
  --bg-deep: #06070a;
  --bg-base: #0b0e17;
  --bg-card: #111625;
  --bg-card-hover: #161d31;
  --bg-card-active: #172138;
  --bg-elevated: #1a2238;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(0, 242, 254, 0.4);
  --border-glow: 0 0 20px rgba(0, 242, 254, 0.25);
  
  --text-main: #f1f5f9;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  
  --cyan: #00f2fe;
  --blue: #4facfe;
  --violet: #a855f7;
  --emerald: #10b981;
  --amber: #f59e0b;
  --rose: #f43f5e;

  --grad-vibe: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #a855f7 100%);
  --grad-card: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0) 100%);

  --font-heading: 'Syne', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dyslexia mode overrides */
body.dyslexia-mode {
  --font-heading: 'OpenDyslexic', 'Comic Neue', 'Lexend', sans-serif;
  --font-body: 'OpenDyslexic', 'Comic Neue', 'Lexend', sans-serif;
  letter-spacing: 0.04em !important;
  line-height: 1.65 !important;
}

body.dyslexia-mode p,
body.dyslexia-mode span,
body.dyslexia-mode button,
body.dyslexia-mode h1,
body.dyslexia-mode h2,
body.dyslexia-mode h3 {
  letter-spacing: 0.03em !important;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-deep);
  color: var(--text-main);
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-deep);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background ambient mesh glow */
.bg-mesh-glow {
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 15%, rgba(0, 242, 254, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 80% 30%, rgba(168, 85, 247, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 85%, rgba(79, 172, 254, 0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* App Container */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem 1.5rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Header & Navigation */
.header-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.nav-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.nav-back-link:hover {
  color: var(--cyan);
  border-color: rgba(0, 242, 254, 0.3);
  background: rgba(0, 242, 254, 0.05);
  transform: translateX(-2px);
}

.nav-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--cyan);
  background: rgba(0, 242, 254, 0.1);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 242, 254, 0.25);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-family: inherit;
  transition: var(--transition);
}

.icon-btn:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.06);
}

.icon-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 242, 254, 0.1);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.2);
}

/* Hero Section */
.hero-section {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.app-title {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
  background: var(--grad-vibe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.02em;
}

.app-subtitle {
  color: var(--text-dim);
  font-size: 1.15rem;
  max-width: 600px;
  font-weight: 400;
  line-height: 1.5;
}

/* Master Control Banner */
.master-card {
  background: var(--bg-card);
  background-image: var(--grad-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  overflow: hidden;
}

.master-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-vibe);
  opacity: 0.7;
}

.master-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.master-play-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-primary-glow {
  background: var(--grad-vibe);
  color: #07080c;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  border: none;
  border-radius: var(--radius-full);
  padding: 0.85rem 1.85rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  box-shadow: 0 0 24px rgba(0, 242, 254, 0.4);
  transition: var(--transition);
}

.btn-primary-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.65);
}

.btn-primary-glow.playing {
  background: linear-gradient(135deg, #10b981 0%, #00f2fe 100%);
  box-shadow: 0 0 28px rgba(16, 185, 129, 0.45);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: inherit;
  font-weight: 500;
  font-size: 0.9rem;
  border-radius: var(--radius-md);
  padding: 0.65rem 1.1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.2);
}

.master-volume-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
  max-width: 380px;
  min-width: 240px;
}

.volume-icon {
  color: var(--text-dim);
  display: flex;
  align-items: center;
}

.master-slider-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.slider-val-badge {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan);
  min-width: 42px;
  text-align: right;
}

/* Audio Visualizer Canvas Container */
.visualizer-container {
  position: relative;
  width: 100%;
  height: 85px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visualizer-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.visualizer-overlay {
  position: absolute;
  right: 12px;
  top: 10px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 2;
}

.viz-select {
  background: rgba(11, 14, 23, 0.8);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  color: var(--text-dim);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  outline: none;
}

.viz-select:focus {
  border-color: var(--cyan);
}

/* Presets Bar */
.presets-section {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.presets-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.presets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.75rem;
}

.preset-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.preset-btn:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 242, 254, 0.3);
  transform: translateY(-2px);
}

.preset-btn.active {
  background: var(--bg-card-active);
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.25);
}

.preset-name {
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.preset-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* Custom Presets Area */
.custom-presets-wrapper {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.custom-presets-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.custom-presets-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.empty-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.custom-preset-item {
  display: inline-flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: var(--transition-fast);
}

.custom-preset-btn {
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 0.82rem;
  font-family: inherit;
  padding: 0.35rem 0.75rem 0.35rem 0.85rem;
  cursor: pointer;
}

.custom-preset-btn:hover {
  color: var(--cyan);
}

.custom-preset-btn.active {
  color: var(--cyan);
  font-weight: 600;
}

.delete-preset-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem 0.6rem;
  font-size: 1.1rem;
  line-height: 1;
  transition: var(--transition-fast);
}

.delete-preset-btn:hover {
  color: var(--rose);
  background: rgba(244, 63, 94, 0.15);
}

/* Main Soundscapes Grid */
.tracks-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tracks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.25rem;
}

/* Track Card */
.track-card {
  background: var(--bg-card);
  background-image: var(--grad-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  position: relative;
  transition: var(--transition);
}

.track-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.track-card.active {
  border-color: rgba(0, 242, 254, 0.35);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.track-card.is-sounding {
  border-color: var(--cyan);
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.2);
}

.track-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
}

.track-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.track-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.track-icon {
  font-size: 1.35rem;
  line-height: 1;
}

.track-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.track-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Power toggle switch */
.track-toggle-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.track-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

.track-card.active .track-toggle-btn {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.3);
}

/* Slider control row */
.track-slider-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.track-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  min-width: 42px;
  text-align: right;
}

.track-card.active .track-val {
  color: var(--cyan);
}

/* Custom Styled Range Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 7px;
  background: rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 8px rgba(0, 242, 254, 0.6);
  cursor: pointer;
  transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 242, 254, 0.9);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 8px rgba(0, 242, 254, 0.6);
  cursor: pointer;
  transition: var(--transition-fast);
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.2);
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 242, 254, 0.9);
}

/* Track Card Extra Controls */
.track-extra-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.trigger-rumble-btn {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fbbf24;
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.trigger-rumble-btn:hover {
  background: rgba(245, 158, 11, 0.3);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.4);
}

.trigger-rumble-btn.flash-thunder {
  animation: flashThunder 0.5s ease;
}

@keyframes flashThunder {
  0% { background: #ffffff; color: #000; box-shadow: 0 0 30px #ffffff; }
  100% { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
}

/* Lo-Fi Specific Controls */
.lofi-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 0.5rem;
}

.lofi-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-size: 0.8rem;
  font-family: inherit;
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  outline: none;
}

.mode-toggle-group {
  display: inline-flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.mode-toggle-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.mode-toggle-btn.active {
  background: rgba(0, 242, 254, 0.15);
  color: var(--cyan);
  font-weight: 600;
}

/* Live Chord Badge */
.chord-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.chord-badge {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--cyan);
  background: rgba(0, 242, 254, 0.1);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 242, 254, 0.3);
  transition: var(--transition-fast);
}

.chord-badge.pulse-chord {
  animation: chordPulse 0.8s ease-out;
}

@keyframes chordPulse {
  0% { transform: scale(1.15); box-shadow: 0 0 16px rgba(0, 242, 254, 0.8); }
  100% { transform: scale(1); box-shadow: none; }
}

/* Timer Section (Pomodoro & Sleep) */
.timer-card {
  background: var(--bg-card);
  background-image: var(--grad-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.timer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.timer-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.timer-display {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--cyan);
  text-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
  letter-spacing: -0.02em;
  line-height: 1;
}

.timer-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timer-btn-primary {
  background: rgba(0, 242, 254, 0.15);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-md);
  padding: 0.65rem 1.2rem;
  cursor: pointer;
  transition: var(--transition);
}

.timer-btn-primary:hover {
  background: var(--cyan);
  color: #07080c;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
}

.timer-btn-primary.active {
  background: linear-gradient(135deg, #10b981 0%, #00f2fe 100%);
  color: #07080c;
  border-color: #10b981;
}

.timer-presets-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timer-preset-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.timer-preset-btn:hover {
  background: rgba(255, 255, 255, 0.09);
  color: var(--text-main);
}

.timer-preset-btn.active {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--cyan);
  color: var(--cyan);
}

.custom-timer-group {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.custom-timer-input {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  width: 55px;
  text-align: center;
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.35rem;
  outline: none;
}

.custom-timer-input:focus {
  border-color: var(--cyan);
}

/* Progress bar */
.timer-progress-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.timer-progress-fill {
  width: 0%;
  height: 100%;
  background: var(--grad-vibe);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.6);
  transition: width 1s linear;
}

.timer-option-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.checkbox-custom {
  accent-color: var(--cyan);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* Footer Section */
.app-footer {
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.footer-link {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--cyan);
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-active);
  box-shadow: var(--border-glow);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transform: scale(0.95);
  transition: var(--transition);
}

.modal-overlay.open .modal-box {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-input {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  outline: none;
  width: 100%;
}

.modal-input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.3);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.shortcuts-table td {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.shortcut-kbd {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--cyan);
}

/* Toast Notification */
.ambient-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  background: var(--bg-card);
  border: 1px solid var(--cyan);
  box-shadow: 0 8px 30px rgba(0, 242, 254, 0.3);
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ambient-toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .app-container {
    padding: 1rem 1rem 2rem 1rem;
    gap: 1.5rem;
  }
  .app-title {
    font-size: 2.2rem;
  }
  .master-card {
    padding: 1.25rem;
  }
  .master-row {
    flex-direction: column;
    align-items: stretch;
  }
  .master-volume-group {
    max-width: 100%;
  }
  .timer-row {
    flex-direction: column;
    align-items: stretch;
  }
  .timer-left {
    justify-content: space-between;
  }
  .tracks-grid {
    grid-template-columns: 1fr;
  }
}