/* ============================================================================
   Flovia Web Demo - Styles
   ============================================================================ */

/* CSS Variables */
:root {
  /* Colors - 提高对比度 */
  --bg-primary: #0f0f12;
  --bg-secondary: #16161a;
  --bg-tertiary: #1e1e24;
  --bg-card: rgba(255, 255, 255, 0.06);
  
  --text-primary: #ffffff;
  --text-secondary: #b8b8c0;
  --text-muted: #72727e;
  
  --accent-blue: #6db3f2;
  --accent-blue-dim: rgba(109, 179, 242, 0.2);
  --accent-green: #4ade80;
  --accent-green-dim: rgba(74, 222, 128, 0.2);
  --accent-purple: #b794f6;
  --accent-purple-dim: rgba(183, 148, 246, 0.2);
  
  --border-subtle: rgba(255, 255, 255, 0.1);
  --border-medium: rgba(255, 255, 255, 0.18);
  
  /* Typography */
  --font-display: 'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
  --easing-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Layout */
  --container-width: 100%;
  --player-height: 280px;
  --header-height: 64px;
}

@media (min-width: 768px) {
  :root {
    --container-width: 720px;
    --player-height: 360px;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-width: 960px;
    --player-height: 420px;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-display);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================================
   Header
   ============================================================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text-primary);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--accent-blue);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 100px;
  transition: all var(--transition-normal) var(--easing-smooth);
}

.btn-header {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
}

.btn-header:hover {
  background: var(--bg-card);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-primary {
  background: var(--accent-blue);
  color: var(--bg-primary);
  font-weight: 600;
  box-shadow: 0 0 40px rgba(96, 165, 250, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px rgba(96, 165, 250, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-large {
  padding: var(--space-4) var(--space-7);
  font-size: 1rem;
}

.btn-icon {
  font-size: 0.75rem;
}

/* ============================================================================
   Hero Section
   ============================================================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-height) + var(--space-8)) var(--space-5) var(--space-8);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(96, 165, 250, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(167, 139, 250, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 50% 30% at 20% 80%, rgba(52, 211, 153, 0.06) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s var(--easing-smooth) both;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
  animation: fadeInUp 0.6s var(--easing-smooth) 0.1s both;
}

.title-line {
  display: block;
}

.title-gradient {
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 50%, var(--accent-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-7);
  animation: fadeInUp 0.6s var(--easing-smooth) 0.2s both;
}

.hero-content .btn {
  animation: fadeInUp 0.6s var(--easing-smooth) 0.3s both;
}

.hero-hint {
  margin-top: var(--space-4);
  font-size: 0.8125rem;
  color: var(--text-muted);
  animation: fadeInUp 0.6s var(--easing-smooth) 0.4s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero Visual - Orbits */
.hero-visual {
  position: absolute;
  width: 600px;
  height: 600px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 0;
  pointer-events: none;
}

.orbit {
  position: absolute;
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.orbit-1 {
  width: 200px;
  height: 200px;
  animation: orbit-rotate 20s linear infinite;
}

.orbit-2 {
  width: 350px;
  height: 350px;
  animation: orbit-rotate 30s linear infinite reverse;
}

.orbit-3 {
  width: 500px;
  height: 500px;
  animation: orbit-rotate 40s linear infinite;
}

.orbit::before {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent-blue);
  border-radius: 50%;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 20px var(--accent-blue);
}

.orbit-2::before {
  background: var(--accent-purple);
  box-shadow: 0 0 20px var(--accent-purple);
}

.orbit-3::before {
  background: var(--accent-green);
  box-shadow: 0 0 20px var(--accent-green);
}

@keyframes orbit-rotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.center-glow {
  position: absolute;
  width: 100px;
  height: 100px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(96, 165, 250, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  animation: glow-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
  50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

/* ============================================================================
   Player Section
   ============================================================================ */

.player-section {
  display: none;
  padding: var(--space-8) var(--space-5);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  animation: slideDown 0.5s var(--easing-smooth);
}

.player-section.active {
  display: block;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.player-container {
  max-width: var(--container-width);
  margin: 0 auto;
}

/* Visualizer */
.visualizer-wrapper {
  position: relative;
  width: 100%;
  height: var(--player-height);
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-primary);
  margin-bottom: var(--space-6);
}

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

.visualizer-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.now-playing {
  text-align: center;
}

.now-playing-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.track-name {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.track-mode {
  font-size: 0.875rem;
  color: var(--accent-blue);
}

/* Player Controls */
.player-controls {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 16px;
  padding: var(--space-5);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.progress-bar-container {
  margin-bottom: var(--space-5);
}

.progress-bar {
  position: relative;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  cursor: pointer;
  overflow: hidden;
}

.progress-fill {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0%;
  background: var(--accent-blue);
  border-radius: 2px;
  transition: width 0.1s linear;
}

.progress-glow {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: var(--accent-blue);
  border-radius: 50%;
  box-shadow: 0 0 20px var(--accent-blue);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.progress-bar:hover .progress-glow {
  opacity: 1;
}

.progress-time {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-2);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.controls-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.control-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal) var(--easing-smooth);
  box-shadow: 0 0 30px rgba(96, 165, 250, 0.3);
}

.control-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 40px rgba(96, 165, 250, 0.4);
}

.control-btn:active {
  transform: scale(0.95);
}

.control-btn svg {
  width: 28px;
  height: 28px;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-secondary);
}

.volume-icon {
  width: 20px;
  height: 20px;
}

.volume-slider {
  -webkit-appearance: none;
  width: 100px;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  outline: none;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.volume-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Track Selector */
.track-selector {
  margin-bottom: var(--space-5);
}

.selector-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-3);
}

.track-card {
  padding: var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition-normal) var(--easing-smooth);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.track-card:hover {
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  background: var(--bg-card);
}

.track-card.active {
  border-color: var(--accent-blue);
  box-shadow: 0 0 20px rgba(109, 179, 242, 0.2);
  background: var(--accent-blue-dim);
}

.track-card-name {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.track-card-mode {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.track-card.active .track-card-mode {
  color: var(--accent-blue);
}

/* Science Card */
.science-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4);
  background: rgba(109, 179, 242, 0.08);
  border-radius: 12px;
  border: 1px solid rgba(109, 179, 242, 0.2);
}

.science-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.science-text {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================================================
   Features Section
   ============================================================================ */

.features {
  padding: var(--space-9) var(--space-5);
  background: var(--bg-primary);
}

.features-content {
  max-width: var(--container-width);
  margin: 0 auto;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-8);
  letter-spacing: -0.02em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.feature-card {
  padding: var(--space-6);
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 20px;
  transition: all var(--transition-normal) var(--easing-smooth);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.feature-card:hover {
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
  border-radius: 16px;
  margin-bottom: var(--space-5);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-icon-green {
  background: var(--accent-green-dim);
  color: var(--accent-green);
}

.feature-icon-purple {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.research-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  max-width: 700px;
  margin: 0 auto;
}

.research-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-blue);
  flex-shrink: 0;
}

.research-note p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ============================================================================
   Science Section
   ============================================================================ */

.science-section {
  padding: var(--space-9) var(--space-5);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
}

.science-content {
  max-width: var(--container-width);
  margin: 0 auto;
}

.science-intro {
  text-align: center;
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.research-card {
  padding: var(--space-6);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 16px;
  transition: all var(--transition-normal) var(--easing-smooth);
}

.research-card:hover {
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.research-header {
  margin-bottom: var(--space-4);
}

.research-category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 100px;
}

.research-card:nth-child(1) .research-category {
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
}

.research-card:nth-child(2) .research-category {
  background: var(--accent-green-dim);
  color: var(--accent-green);
}

.research-card:nth-child(3) .research-category {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}

.research-card:nth-child(4) .research-category {
  background: rgba(251, 191, 36, 0.2);
  color: #fbbf24;
}

.research-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.research-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.research-citation {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.citation-icon {
  flex-shrink: 0;
}

.research-citation em {
  color: var(--text-secondary);
}

.research-note p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================================================
   CTA Section
   ============================================================================ */

.cta-section {
  position: relative;
  padding: var(--space-9) var(--space-5);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  overflow: hidden;
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.cta-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.cta-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-7);
}

.app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: 12px;
  transition: all var(--transition-normal) var(--easing-smooth);
}

.app-store-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(255, 255, 255, 0.1);
}

.apple-icon {
  width: 28px;
  height: 28px;
}

.app-store-text {
  text-align: left;
}

.app-store-label {
  display: block;
  font-size: 0.6875rem;
  opacity: 0.8;
}

.app-store-title {
  display: block;
  font-size: 1.125rem;
  font-weight: 600;
}

.cta-particles {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 50% at 50% 100%, rgba(96, 165, 250, 0.08) 0%, transparent 70%);
}

/* ============================================================================
   Footer
   ============================================================================ */

.footer {
  padding: var(--space-7) var(--space-5);
  background: var(--bg-primary);
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-logo {
  width: 20px;
  height: 20px;
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ============================================================================
   Loading Overlay
   ============================================================================ */

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  z-index: 1000;
}

.loading-overlay.active {
  display: flex;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================================================
   Responsive Adjustments
   ============================================================================ */

@media (max-width: 767px) {
  .hero-visual {
    width: 400px;
    height: 400px;
    opacity: 0.5;
  }
  
  .orbit-1 { width: 140px; height: 140px; }
  .orbit-2 { width: 240px; height: 240px; }
  .orbit-3 { width: 340px; height: 340px; }
  
  .controls-row {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .volume-control {
    order: 1;
  }
  
  .track-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-badge {
    font-size: 0.75rem;
    padding: var(--space-1) var(--space-3);
  }
  
  .hero-subtitle br {
    display: none;
  }
  
  .btn-large {
    padding: var(--space-3) var(--space-5);
    font-size: 0.9375rem;
  }
  
  .track-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================================
   Mode-specific Colors
   ============================================================================ */

[data-mode="deep-work"] .track-mode,
[data-mode="deep-work"] .track-card.active .track-card-mode {
  color: var(--accent-blue);
}

[data-mode="quick-recharge"] .track-mode,
[data-mode="quick-recharge"] .track-card.active .track-card-mode {
  color: var(--accent-green);
}

[data-mode="wind-down"] .track-mode,
[data-mode="wind-down"] .track-card.active .track-card-mode {
  color: var(--accent-purple);
}

/* Visualizer Mode Colors */
.visualizer-wrapper[data-mode="deep-work"] {
  --particle-color: var(--accent-blue);
}

.visualizer-wrapper[data-mode="quick-recharge"] {
  --particle-color: var(--accent-green);
}

.visualizer-wrapper[data-mode="wind-down"] {
  --particle-color: var(--accent-purple);
}