/**
 * 4uonly Music Platform - Single Song Page & Multi-Tab Lyrics Interface
 * 100% Mobile Responsive (360px - 430px+), Zero Horizontal Overflow
 */

/* Breadcrumbs */
.four-breadcrumbs {
  display: flex !important;
  align-items: center !important;
  flex-wrap: wrap !important;
  gap: var(--sp-6) !important;
  font-size: 0.8rem !important;
  color: var(--text-tertiary) !important;
  margin-bottom: var(--sp-14) !important;
  line-height: 1.4 !important;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
  word-break: break-word !important;
  overflow-wrap: anywhere !important;
}

.four-breadcrumbs a {
  color: var(--text-secondary);
  transition: color var(--trans-fast);
}

.four-breadcrumbs a:hover {
  color: var(--accent-primary);
}

.four-breadcrumbs span.sep {
  color: var(--text-tertiary);
  opacity: 0.6;
}

.four-breadcrumbs span.current {
  color: var(--text-primary);
  font-weight: 600;
}

/* Song Page Layout */
.four-song-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: var(--sp-24);
  align-items: start;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.four-song-main {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.four-song-sidebar {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

/* Song Hero Card */
.four-song-hero-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--sp-20);
  display: flex;
  gap: var(--sp-20);
  margin-bottom: var(--sp-24);
  align-items: center;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.four-song-hero-artwork {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: var(--shadow-lg);
  background: var(--bg-surface-3);
  display: block;
}

.four-song-hero-artwork img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.four-song-hero-details {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
}

.four-song-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-6);
  margin-bottom: var(--sp-8);
  max-width: 100%;
  box-sizing: border-box;
}

.four-song-hero-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: var(--sp-6);
  word-break: break-word;
  overflow-wrap: anywhere;
  max-width: 100%;
}

.four-song-hero-artist {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--sp-12);
  word-break: break-word;
  overflow-wrap: anywhere;
  max-width: 100%;
}

.four-song-hero-artist a {
  color: var(--accent-primary);
  font-weight: 600;
}

.four-song-meta-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-6);
  margin-bottom: var(--sp-14);
  font-size: 0.8rem;
  color: var(--text-secondary);
  max-width: 100%;
  box-sizing: border-box;
}

.four-meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-surface-2);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  max-width: 100%;
  box-sizing: border-box;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.four-meta-pill strong {
  color: var(--text-primary);
}

.four-song-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-8);
  max-width: 100%;
  box-sizing: border-box;
}

/* Embedded YouTube Video Container */
.four-video-section {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--sp-16);
  margin-bottom: var(--sp-24);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.four-video-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-10);
  flex-wrap: wrap;
  gap: var(--sp-6);
  width: 100%;
  box-sizing: border-box;
}

.four-video-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.four-video-wrapper {
  position: relative;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  box-sizing: border-box;
}

.four-video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* MULTI-TAB LYRICS READER INTERFACE */
.four-lyrics-container {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--sp-20);
  margin-bottom: var(--sp-24);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.four-lyrics-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--sp-12);
  margin-bottom: var(--sp-16);
  gap: var(--sp-8);
  flex-wrap: wrap;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.four-lyrics-tabs {
  display: flex;
  gap: var(--sp-6);
  flex-wrap: wrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  max-width: 100%;
  box-sizing: border-box;
}

.four-lyrics-tabs::-webkit-scrollbar {
  display: none;
}

.four-lyrics-tab-btn {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.825rem;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--trans-fast);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
  flex-shrink: 0;
  box-sizing: border-box;
}

.four-lyrics-tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
}

.four-lyrics-tab-btn.active {
  background: var(--accent-primary) !important;
  color: #ffffff !important;
  border-color: var(--accent-primary) !important;
  font-weight: 700;
  box-shadow: var(--shadow-glow);
}

.four-lyrics-controls {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  flex-shrink: 0;
}

.four-lyrics-control-btn {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
  transition: all var(--trans-fast);
  flex-shrink: 0;
}

.four-lyrics-control-btn:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Lyrics Content Panes */
.four-lyrics-pane {
  display: none;
  font-family: var(--font-lyrics);
  font-size: 1.05rem;
  line-height: 2.1;
  color: #0f172a !important; /* High-Contrast for Light Theme */
  font-weight: 500;
  letter-spacing: 0.015em;
  white-space: pre-line;
  max-width: 680px;
  width: 100%;
  word-break: break-word;
  overflow-wrap: anywhere;
  box-sizing: border-box;
}

[data-theme="dark"] .four-lyrics-pane {
  color: #f8fafc !important; /* High-Contrast for Dark Theme */
}

.four-lyrics-pane p,
.four-lyrics-pane span,
.four-lyrics-pane div {
  color: inherit !important;
  line-height: inherit !important;
  word-break: break-word !important;
  overflow-wrap: anywhere !important;
}

.four-lyrics-pane.active {
  display: block;
  animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.four-lyrics-pane.large-text {
  font-size: 1.25rem !important;
  line-height: 2.3 !important;
}

.four-lyrics-pane.small-text {
  font-size: 0.95rem !important;
  line-height: 1.8 !important;
}

/* Song Meaning & Editorial Story */
.four-meaning-card {
  background: var(--bg-surface-2);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: var(--sp-14);
  margin-top: var(--sp-16);
  width: 100%;
  box-sizing: border-box;
}

.four-meaning-card h3 {
  font-size: 1.05rem;
  margin-bottom: var(--sp-6);
  color: var(--accent-primary);
}

.four-meaning-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 0.925rem;
}

/* Metadata & Credits Table */
.four-song-credits {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--sp-20);
  margin-bottom: var(--sp-24);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.four-credits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--sp-12);
  margin-top: var(--sp-14);
  width: 100%;
  box-sizing: border-box;
}

.four-credit-item {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.four-credit-label {
  font-size: 0.725rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: 2px;
}

.four-credit-val {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
  overflow-wrap: anywhere;
}

/* Sidebar Widgets */
.four-sidebar-widget {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--sp-16);
  margin-bottom: var(--sp-16);
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.four-sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--sp-12);
  padding-bottom: var(--sp-6);
  border-bottom: 1px solid var(--border-subtle);
}

.four-artist-mini-card {
  display: flex;
  align-items: center;
  gap: var(--sp-12);
  text-decoration: none;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.four-artist-mini-avatar {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  overflow: hidden;
  flex-shrink: 0;
  border: 2px solid var(--border-subtle);
}

.four-artist-mini-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.four-artist-mini-info {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
}

.four-artist-mini-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.four-artist-mini-info p {
  font-size: 0.775rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Comprehensive Mobile Viewports Optimization (360px - 768px) */
@media (max-width: 960px) {
  .four-song-layout {
    display: flex !important;
    flex-direction: column !important;
    gap: var(--sp-16) !important;
    width: 100% !important;
    max-width: 100% !important;
  }
}

@media (max-width: 640px) {
  .four-song-hero-card {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
    padding: 14px !important;
    gap: 12px !important;
  }
  .four-song-hero-artwork {
    width: 120px !important;
    height: 120px !important;
    min-width: 120px !important;
    max-width: 120px !important;
    margin: 0 auto !important;
    border-radius: var(--radius-md) !important;
    display: block !important;
  }
  .four-song-hero-artwork img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover !important;
    display: block !important;
  }
  .four-song-hero-title {
    font-size: 1.35rem !important;
    margin-bottom: 2px !important;
  }
  .four-song-hero-artist {
    font-size: 0.9rem !important;
    margin-bottom: 8px !important;
  }
  .four-song-hero-tags {
    justify-content: center !important;
  }
  .four-song-meta-pill-row {
    justify-content: center !important;
    gap: 4px !important;
    margin-bottom: 12px !important;
  }
  .four-meta-pill {
    padding: 3px 6px !important;
    font-size: 0.725rem !important;
  }
  .four-song-actions {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    width: 100% !important;
    max-width: 100% !important;
    gap: 6px !important;
  }
  .four-song-actions .four-btn {
    padding: 8px 4px !important;
    font-size: 0.775rem !important;
    width: 100% !important;
    white-space: normal !important;
    line-height: 1.2 !important;
  }
  .four-lyrics-container {
    padding: 12px !important;
  }
  .four-lyrics-nav-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 8px !important;
  }
  .four-lyrics-tabs {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    gap: 4px !important;
    padding-bottom: 4px !important;
    -webkit-overflow-scrolling: touch;
    width: 100% !important;
    max-width: 100% !important;
  }
  .four-lyrics-tab-btn {
    padding: 5px 10px !important;
    font-size: 0.775rem !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
    min-height: 36px !important;
  }
  .four-lyrics-controls {
    justify-content: space-between !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  .four-lyrics-pane {
    font-size: 0.975rem !important;
    line-height: 1.95 !important;
  }
  .four-credits-grid {
    grid-template-columns: 1fr 1fr !important;
    gap: 8px !important;
  }
  .four-video-section {
    padding: 12px !important;
  }
}