/* ===========================================
   Track Page Styles - ゆるいむくん
   =========================================== */

:root {
  --color-bg: #121212;
  --color-bg-elevated: #1a1a1a;
  --color-bg-card: #242424;
  --color-text: #ffffff;
  --color-text-muted: #b3b3b3;
  --color-text-light: #888888;
  --color-accent: #1ed760;
  --color-accent-hover: #1fdf64;
  --color-border: #333333;
  --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --border-radius: 8px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

.logo:hover {
  color: var(--color-accent);
}

.nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition);
}

.nav a:hover {
  color: var(--color-text);
}

/* Main Content */
.track-detail {
  flex: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  width: 100%;
}

.track-content {
  background: var(--color-bg-elevated);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
}

.track-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-accent), #ffffff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Track Meta */
.track-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border-radius: var(--border-radius);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-label {
  font-size: 0.75rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-value {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

/* Player Placeholder */
.track-player {
  margin-bottom: var(--spacing-lg);
}

.player-placeholder {
  background: var(--color-bg-card);
  border: 2px dashed var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-muted);
}

/* Track Sections */
.track-section {
  margin-bottom: var(--spacing-lg);
}

.track-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-border);
}

.track-section p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.track-section p:last-child {
  margin-bottom: 0;
}

/* Instrument List */
.instrument-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.instrument-list li {
  background: var(--color-bg-card);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Related Tracks */
.related-section {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

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

.related-track {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: transform var(--transition), background var(--transition);
}

.related-track:hover {
  transform: translateY(-2px);
  background: var(--color-border);
}

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

.related-genre {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* Footer */
.site-footer {
  padding: var(--spacing-lg);
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.site-footer p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

.footer-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition);
}

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

/* Track List Page Styles */
.track-list-page {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  width: 100%;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-align: center;
  background: linear-gradient(135deg, var(--color-accent), #ffffff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-description {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

.track-card {
  background: var(--color-bg-elevated);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  text-decoration: none;
  transition: transform var(--transition), background var(--transition);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.track-card:hover {
  transform: translateY(-4px);
  background: var(--color-bg-card);
}

.track-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
}

.track-card-genre {
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.track-card-description {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Responsive */
@media (max-width: 768px) {
  .site-header {
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
  }

  .track-detail {
    padding: var(--spacing-md);
  }

  .track-content {
    padding: var(--spacing-md);
  }

  .track-title {
    font-size: 1.75rem;
  }

  .track-meta {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .related-tracks {
    grid-template-columns: 1fr;
  }

  .track-list-page {
    padding: var(--spacing-md);
  }

  .page-title {
    font-size: 1.75rem;
  }

  .track-grid {
    grid-template-columns: 1fr;
  }
}

.play-link {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition);
}

.play-link:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}