/* Top Songs By Year - Main Stylesheet */
/* Mobile-first responsive design with dark/light mode support */

:root {
  /* Light mode colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --accent-primary: #007bff;
  --accent-secondary: #6f42c1;
  --accent-success: #28a745;
  --accent-warning: #ffc107;
  --accent-danger: #dc3545;
  --border-color: #dee2e6;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
  /* Dark mode colors */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --accent-primary: #4dabf7;
  --accent-secondary: #9775fa;
  --accent-success: #51cf66;
  --accent-warning: #ffd43b;
  --accent-danger: #ff6b6b;
  --border-color: #495057;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-secondary);
  text-decoration: underline;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.container-fluid {
  width: 100%;
  padding: 0 1rem;
}

/* Header */
.header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.logo h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.logo .subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--accent-primary);
}

.theme-icon {
  font-size: 1.1rem;
}

/* Navigation */
.nav {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 0;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-item a {
  padding: 0.5rem 1rem;
  border-radius: 25px;
  transition: all 0.3s ease;
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-item a:hover,
.nav-item a.active {
  background-color: var(--accent-primary);
  color: white;
  text-decoration: none;
}

/* Main content */
.main {
  min-height: calc(100vh - 200px);
  padding: 2rem 0;
}

/* Hero section */
.hero {
  text-align: center;
  padding: 3rem 0;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border-radius: 15px;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Decade grid */
.decade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.decade-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 15px;
  padding: 2rem;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.decade-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

.decade-card:hover::before {
  left: 100%;
}

.decade-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
  border-color: var(--accent-primary);
}

.decade-card h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.decade-card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.decade-card .status {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status.active {
  background-color: var(--accent-success);
  color: white;
}

.status.coming-soon {
  background-color: var(--accent-warning);
  color: var(--text-primary);
}

/* Content sections */
.content-section {
  margin: 3rem 0;
  padding: 2rem;
  background-color: var(--bg-secondary);
  border-radius: 15px;
  border: 1px solid var(--border-color);
}

.content-section h2 {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--accent-primary);
  color: var(--text-primary);
}

/* Year navigation */
.year-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
  justify-content: center;
}

.year-link {
  padding: 0.75rem 1.5rem;
  background-color: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 25px;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.3s ease;
  font-weight: 500;
}

.year-link:hover {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  text-decoration: none;
}

.year-link.active {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* Music lists */
.music-list {
  list-style: none;
  counter-reset: song-counter;
}

.music-item {
  display: flex;
  align-items: center;
  padding: 1rem;
  margin-bottom: 0.5rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  transition: all 0.3s ease;
  counter-increment: song-counter;
}

.music-item:hover {
  background-color: var(--bg-tertiary);
  transform: translateX(5px);
}

.music-item::before {
  content: counter(song-counter);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--accent-primary);
  color: white;
  border-radius: 50%;
  font-weight: bold;
  margin-right: 1rem;
  flex-shrink: 0;
}

.music-info {
  flex: 1;
}

.music-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.music-artist {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.music-genre {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background-color: var(--accent-secondary);
  color: white;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-left: 1rem;
}

/* Genre sections */
.genre-section {
  margin: 2rem 0;
  padding: 1.5rem;
  background-color: var(--bg-primary);
  border-radius: 10px;
  border-left: 4px solid var(--accent-primary);
}

.genre-section h3 {
  color: var(--accent-primary);
  margin-bottom: 1rem;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-top: 3rem;
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* Responsive design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  
  .logo h1 {
    font-size: 1.8rem;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero .subtitle {
    font-size: 1rem;
  }
  
  .decade-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-list {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .year-nav {
    flex-direction: column;
    align-items: center;
  }
  
  .music-item {
    flex-direction: column;
    text-align: center;
  }
  
  .music-item::before {
    margin-right: 0;
    margin-bottom: 0.5rem;
  }
  
  .music-genre {
    margin-left: 0;
    margin-top: 0.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.5rem;
  }
  
  .hero {
    padding: 2rem 1rem;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .content-section {
    padding: 1rem;
  }
  
  .decade-card {
    padding: 1.5rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
.year-link:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .header,
  .nav,
  .footer,
  .theme-toggle {
    display: none;
  }
  
  .main {
    margin: 0;
    padding: 0;
  }
  
  .hero {
    background: none;
    border: 1px solid #000;
  }
  
  .decade-card,
  .content-section {
    break-inside: avoid;
    border: 1px solid #000;
  }
}