/* Ukulele Öğrenme Platformu - Modern CSS Tasarım Sistemi */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

/* CSS Değişkenleri - Renk Paleti */
:root {
  /* Ana Renkler - Müzik Temalı Gradyanlar */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  
  /* Solid Renkler */
  --primary: #667eea;
  --primary-dark: #5568d3;
  --secondary: #f5576c;
  --accent: #00f2fe;
  --success: #43e97b;
  --warning: #ffd93d;
  
  /* Nötr Renkler - Dark Theme */
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-card: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #b8b8d1;
  --text-muted: #6b6b8c;
  
  /* Glassmorphism - Dark Theme */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8e8e8;
  --bg-card: rgba(0, 0, 0, 0.05);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #6b6b8c;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(245, 87, 108, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(0, 242, 254, 0.1) 0%, transparent 50%);
  z-index: -1;
  animation: backgroundPulse 15s ease-in-out infinite;
}

@keyframes backgroundPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--text-primary);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
header {
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
  gap: var(--spacing-md);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 0;
}

.theme-icon {
  width: 20px;
  height: 20px;
  stroke: var(--text-primary);
  transition: transform var(--transition-fast);
}

.theme-toggle:hover .theme-icon {
  transform: rotate(20deg) scale(1.1);
}

.theme-toggle:hover {
  background: var(--primary-gradient);
  border-color: transparent;
  transform: scale(1.1);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: 'Outfit', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.05);
}

.logo-icon {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.5));
  transition: transform var(--transition-fast);
}

.logo:hover .logo-icon {
  transform: rotate(10deg) scale(1.1);
}

/* Navigation */
nav {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: nowrap;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 3px;
  transition: all var(--transition-normal);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.nav-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-btn:hover {
  background: var(--primary-gradient);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.nav-btn.active {
  background: var(--primary-gradient);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* Difficulty Selector */
.difficulty-selector {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) 0;
  justify-content: center;
  flex-wrap: wrap;
}

.difficulty-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  min-width: 150px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.difficulty-icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  flex-shrink: 0;
}

.difficulty-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.difficulty-btn:hover::before {
  left: 100%;
}

.difficulty-btn:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

.difficulty-btn.active {
  border-color: var(--primary);
  box-shadow: 0 0 30px rgba(102, 126, 234, 0.6);
}

.difficulty-btn.beginner.active {
  background: var(--success-gradient);
  border-color: transparent;
}

.difficulty-btn.intermediate.active {
  background: var(--accent-gradient);
  border-color: transparent;
}

.difficulty-btn.advanced.active {
  background: var(--secondary-gradient);
  border-color: transparent;
}

/* Main Content */
main {
  padding: var(--spacing-xl) 0;
  min-height: 70vh;
}

.section {
  display: none;
  animation: fadeIn var(--transition-slow);
}

.section.active {
  display: block;
}

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

/* Section Header */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.section-icon {
  width: 40px;
  height: 40px;
  stroke: currentColor;
  fill: currentColor;
  flex-shrink: 0;
}

.hero-icon {
  width: 48px;
  height: 48px;
  stroke: currentColor;
  fill: currentColor;
  flex-shrink: 0;
}

.footer-icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  vertical-align: middle;
  margin-right: var(--spacing-xs);
}

.inline-icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  vertical-align: middle;
  margin-right: 4px;
  display: inline-block;
}

.btn-icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  vertical-align: middle;
  margin: 0 4px;
  display: inline-block;
}

.play-tempo-btn .btn-icon {
  fill: currentColor;
  stroke: none;
}

.play-tempo-btn i {
  margin-right: 4px;
  font-size: 0.9em;
}

.play-chord-btn .btn-icon {
  fill: currentColor;
  stroke: none;
}

.section-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* Grid Layouts */
.chord-grid,
.strum-grid,
.progression-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

/* Card Styles */
.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.card:hover::before {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(102, 126, 234, 0.5);
}

/* Chord Card */
.chord-card {
  text-align: center;
}

.chord-name {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

.chord-diagram {
  margin: var(--spacing-lg) auto;
  display: flex;
  justify-content: center;
}

.chord-diagram svg {
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.chord-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.chord-tips {
  background: rgba(67, 233, 123, 0.1);
  border-left: 3px solid var(--success);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: var(--spacing-md);
  text-align: left;
}

.chord-tips ul {
  list-style: disc;
  margin-left: var(--spacing-md);
  padding-left: 0;
}

.chord-tips li {
  margin-bottom: var(--spacing-xs);
  list-style: disc;
}

.chord-tips i,
.finger-positions i {
  color: var(--accent);
  margin-right: var(--spacing-xs);
}

.finger-positions {
  background: rgba(102, 126, 234, 0.1);
  border-left: 3px solid var(--primary);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  text-align: left;
}

.finger-positions ul {
  list-style: none;
  padding-left: 0;
  margin: var(--spacing-xs) 0 0 0;
}

.finger-positions li {
  margin-bottom: var(--spacing-xs);
  padding-left: 0;
  position: relative;
  list-style: disc;
  margin-left: var(--spacing-md);
}

.finger-positions li {
  list-style: disc;
  margin-left: var(--spacing-md);
  padding-left: var(--spacing-xs);
}

.finger-positions li::before {
  display: none;
}

/* Strum Pattern Card */
.strum-card {
  background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(102, 126, 234, 0.05) 100%);
}

.strum-name {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.strum-notation {
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  margin: var(--spacing-lg) 0;
  letter-spacing: 2px;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
  white-space: nowrap;
  padding: var(--spacing-xs) 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
}

.strum-pattern {
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  background: rgba(0, 0, 0, 0.3);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  text-align: center;
  margin: var(--spacing-sm) 0;
  letter-spacing: 2px;
  white-space: nowrap;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
}

.strum-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--spacing-xs);
  letter-spacing: 2px;
  white-space: nowrap;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
}

.play-tempo-btn {
  display: inline-block;
  background: var(--accent-gradient);
  color: var(--bg-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border: none;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  margin-top: var(--spacing-sm);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.play-tempo-btn:hover:not(:disabled) {
  transform: scale(1.05);
}

.play-tempo-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Metronom */
.metronom-container {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.metronom-header {
  margin-bottom: var(--spacing-sm);
}

.metronom-toggle {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-full);
  color: white;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: transform var(--transition-fast);
  margin-bottom: var(--spacing-md);
  display: inline-block;
}

.metronom-toggle i {
  margin-right: 4px;
  font-size: 0.9em;
}

.metronom-toggle:hover {
  transform: scale(1.05);
}

.metronom-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.bpm-control {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.bpm-control label {
  color: var(--text-primary);
  font-weight: 600;
}

.bpm-slider {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  outline: none;
  -webkit-appearance: none;
}

.bpm-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-gradient);
  cursor: pointer;
}

.bpm-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-gradient);
  cursor: pointer;
  border: none;
}

.beat-indicator {
  display: flex;
  justify-content: center;
  padding: var(--spacing-md);
}

.beat-dots {
  display: flex;
  gap: var(--spacing-md);
  font-size: 2rem;
}

.beat-dot {
  transition: all var(--transition-fast);
}

.metronom-info {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Play Chord Button */
.play-chord-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--radius-full);
  color: var(--bg-primary);
  font-weight: 700;
  cursor: pointer;
  margin-top: var(--spacing-sm);
  transition: transform var(--transition-fast);
}

.play-chord-btn:hover {
  transform: scale(1.05);
}


/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--bg-secondary);
  margin: 5% auto;
  padding: var(--spacing-xl);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 800px;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  right: var(--spacing-lg);
  top: var(--spacing-lg);
  font-size: 2rem;
  font-weight: bold;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
}

.print-btn,
.close-modal-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.print-btn {
  background: var(--primary-gradient);
  color: white;
}

.close-modal-btn {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.print-btn:hover,
.close-modal-btn:hover {
  transform: scale(1.05);
}

.view-full-btn {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  transition: transform var(--transition-fast);
}

.view-full-btn:hover {
  transform: translateY(-2px);
}

.more-lyrics {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  margin-top: var(--spacing-sm);
}


.chord-types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.chord-type-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.chord-type-card h4 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.chord-example {
  margin-top: var(--spacing-sm);
  font-family: 'Courier New', monospace;
  color: var(--accent);
}

.finger-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.finger-guide-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.finger-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: white;
  font-size: 2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
}

.finger-guide-card h4 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

/* Footer */
footer {
  background: var(--glass-bg);
  border-top: 1px solid var(--glass-border);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.footer-content {
  color: var(--text-secondary);
}

.footer-content p {
  margin-bottom: var(--spacing-xs);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 600;
}

.footer-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* Responsive Design */
/* Mobile Menu Overlay */
.main-nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.main-nav-overlay.active {
  display: block;
  opacity: 1;
  pointer-events: all;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .chord-grid,
  .strum-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    flex-wrap: nowrap;
  }

  .mobile-menu-toggle {
    display: flex;
    order: 2;
    min-width: 44px;
    min-height: 44px;
  }

  .logo {
    order: 1;
    font-size: 1.4rem;
  }

  .header-actions {
    order: 3;
    flex-direction: row;
    gap: var(--spacing-xs);
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 320px;
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-left: 1px solid var(--glass-border);
    flex-direction: column;
    padding: calc(var(--spacing-xl) + 20px) var(--spacing-lg) var(--spacing-lg);
    transition: right var(--transition-normal);
    z-index: 1001;
    overflow-y: auto;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.4);
    gap: var(--spacing-sm);
  }

  .main-nav.active {
    right: 0;
  }

  .main-nav .nav-btn {
    width: 100%;
    text-align: left;
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    justify-content: flex-start;
    min-height: 44px;
  }

  .main-nav .nav-btn:not(:last-child) {
    margin-bottom: var(--spacing-xs);
  }

  .chord-grid,
  .strum-grid {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  .difficulty-selector {
    flex-direction: column;
    align-items: stretch;
  }
  
  .difficulty-btn {
    width: 100%;
    min-height: 44px;
  }
  
  .strum-notation {
    font-size: 1.5rem;
    letter-spacing: 1px;
  }
  
  .strum-pattern {
    font-size: 1rem;
    letter-spacing: 1px;
  }
  
  .strum-count {
    font-size: 0.85rem;
    letter-spacing: 1px;
  }
  
  .bpm-item {
    flex-direction: column;
  }
  
  .symbol-item {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .symbol-display {
    min-width: auto;
    width: 100%;
  }
  
  .icon-grid,
  .gradient-grid,
  .solid-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  .nav-btn {
    font-size: 0.85rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .difficulty-btn {
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

/* Guide Cards */
.guide-card {
  background: linear-gradient(135deg, var(--glass-bg) 0%, rgba(0, 242, 254, 0.1) 100%);
  grid-column: 1 / -1;
  margin-bottom: var(--spacing-lg);
}

.guide-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.guide-content {
  text-align: left;
}

.bpm-range {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.bpm-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.bpm-label {
  font-weight: 700;
  color: var(--accent);
  font-size: 1.1rem;
}

.bpm-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.guide-note {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  background: rgba(67, 233, 123, 0.1);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--success);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.symbol-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.symbol-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.symbol-display {
  font-weight: 700;
  color: var(--accent);
  font-size: 1.2rem;
  min-width: 40px;
  text-align: center;
  background: rgba(0, 242, 254, 0.1);
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
}

.symbol-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  flex: 1;
}


/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

/* Loading Animation */
.loading {
  display: inline-block;
  width: 50px;
  height: 50px;
  border: 4px solid var(--glass-border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Scroll Animations */
.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Light Theme Additional Styles */
[data-theme="light"] .chord-tips {
  background: rgba(67, 233, 123, 0.15);
}

[data-theme="light"] .finger-positions {
  background: rgba(102, 126, 234, 0.15);
}

[data-theme="light"] .metronom-container {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

[data-theme="light"] .card {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .modal-content {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Dark Theme Additional Styles */
[data-theme="dark"] .chord-tips {
  background: rgba(67, 233, 123, 0.1);
}

[data-theme="dark"] .finger-positions {
  background: rgba(102, 126, 234, 0.1);
}

[data-theme="dark"] .metronom-container {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

[data-theme="dark"] .card {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .modal-content {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] body::before {
  background: 
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(245, 87, 108, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(0, 242, 254, 0.1) 0%, transparent 50%);
}

/* Icon Styles - Dark Mode Support */
[data-theme="dark"] .logo-icon,
[data-theme="dark"] .section-icon,
[data-theme="dark"] .hero-icon,
[data-theme="dark"] .footer-icon,
[data-theme="dark"] .inline-icon,
[data-theme="dark"] .btn-icon,
[data-theme="dark"] .theme-icon,
[data-theme="dark"] .difficulty-icon {
  stroke: var(--text-primary);
  fill: none;
}

[data-theme="light"] .logo-icon,
[data-theme="light"] .section-icon,
[data-theme="light"] .hero-icon,
[data-theme="light"] .footer-icon,
[data-theme="light"] .inline-icon,
[data-theme="light"] .btn-icon,
[data-theme="light"] .theme-icon,
[data-theme="light"] .difficulty-icon {
  stroke: var(--text-primary);
  fill: none;
}

/* SVG icons that should be filled */
.play-tempo-btn img,
.play-chord-btn img {
  fill: currentColor;
  stroke: none;
}