/* ==========================================================================
   Estilos de Navegación Inferior Mobile-First (Bottom Nav Bar & Vistas)
   ========================================================================== */

/* Barra de Navegación Inferior y Barra Player */
.bottom-nav-bar, .bottom-player-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: 68px;
  background-color: var(--bg-surface-solid);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 400;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.2);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

body.theme-ivory .bottom-nav-bar, 
body.theme-ivory .bottom-player-bar {
  background-color: rgba(255, 255, 255, 0.85);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.06);
}

/* Modo Dock Flotante (Escritorio) */
@media (min-width: 800px) {
  .bottom-nav-bar, .bottom-player-bar {
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    min-width: 500px;
    height: 64px;
    border-radius: 32px;
    border: 1px solid var(--border-subtle);
    padding: 0 20px;
    gap: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  }
  
  body.theme-ivory .bottom-nav-bar, 
  body.theme-ivory .bottom-player-bar {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    background-color: rgba(255, 255, 255, 0.95);
  }
}

.nav-tab-btn {
  flex: 1;
  height: 100%;
  background: transparent;
  border: none;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-tab-btn .nav-icon {
  font-size: 1.35rem;
  transition: transform var(--transition-fast);
}

.nav-tab-btn.active {
  color: var(--accent-primary);
}

.nav-tab-btn.active .nav-icon {
  transform: translateY(-2px) scale(1.15);
}

.nav-player-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 6px 10px;
  border-radius: 10px;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  min-width: 54px;
}

.nav-player-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--accent-primary);
}

body.theme-ivory .nav-player-btn:hover {
  background: rgba(0, 0, 0, 0.05);
}

.nav-player-btn.active {
  color: var(--accent-primary);
  background: rgba(255, 87, 34, 0.12);
}

.nav-player-btn.recording-active {
  color: #ff5252;
  background: rgba(255, 82, 82, 0.15);
  animation: pulseRecDot 1.2s infinite;
}

.nav-player-rec-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff5252;
  box-shadow: 0 0 8px #ff5252;
}

.nav-player-scroll-icon {
  font-size: 1.05rem;
}

/* Transpose, Auto-scroll y Metrónomo clusters dentro de la barra inferior */
.nav-player-transpose-cluster,
.nav-player-autoscroll-cluster,
.nav-player-metronome-cluster {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-surface-solid);
  border: 1px solid var(--border-subtle);
  padding: 3px 8px;
  border-radius: 20px;
  max-height: 44px;
  overflow: hidden;
  white-space: nowrap;
}

body.theme-ivory .nav-player-transpose-cluster,
body.theme-ivory .nav-player-autoscroll-cluster,
body.theme-ivory .nav-player-metronome-cluster {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.1);
}

.nav-player-scroll-controls,
.nav-player-metro-controls {
  display: flex;
  align-items: center;
  gap: 3px;
}

.nav-player-step-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 0.82rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.nav-player-step-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.nav-player-val-badge {
  font-size: 0.78rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  padding: 0 4px;
  min-width: 38px;
  text-align: center;
  flex-shrink: 0;
}

/* Contenedores de Vistas Principales */
.view-container {
  display: none;
  width: 100%;
  height: 100%;
  overflow-y: auto;
  padding-bottom: 75px;
}

.view-container.active-view {
  display: block !important;
}

.score-viewport.active-view {
  display: block !important;
}

/* ==========================================================================
   Vista Explorar (Home / Search Hero - Ultimate Guitar UX)
   ========================================================================== */
.explore-view {
  padding: 20px 16px 100px 16px;
  max-width: 1800px;
  width: 96%;
  margin: 0 auto;
}

.explore-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 28px;
  gap: 12px;
  position: relative;
}

.explore-badge-chromatic {
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-strong);
  color: var(--accent-primary);
  font-size: 0.7rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  padding: 4px 14px;
  border-radius: 20px;
  box-shadow: var(--shadow-xs);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.explore-hero-title {
  font-size: 2.2rem;
  font-weight: 900;
  font-family: var(--font-serif);
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.15;
}

.explore-hero-subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.5;
  margin: 0 auto;
}

.explore-search-box {
  width: 100%;
  max-width: 900px;
  position: relative;
  margin-top: 8px;
  margin-left: auto;
  margin-right: auto;
}

.search-svg-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.btn-add-custom-song-hero {
  background: var(--bg-surface-solid);
  border: 1px dashed var(--border-strong);
  color: var(--accent-primary);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-add-custom-song-hero:hover {
  background: var(--bg-surface-hover);
  border-color: var(--accent-primary);
}

.explore-search-input {
  width: 100%;
  padding: 16px 44px 16px 48px;
  font-size: 1.02rem;
  border-radius: 30px;
  background: var(--bg-surface-raised);
  border: 2px solid var(--border-strong);
  color: var(--text-primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-fast);
}

.explore-search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 25px var(--accent-primary-glow);
}

.explore-search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--text-muted);
  pointer-events: none;
}

.btn-clear-search {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px;
}

.explore-genres-section {
  margin-bottom: 24px;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.genre-grid-mobile {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.genre-card-item {
  background: var(--bg-surface-solid);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 10px 18px;
  text-align: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

body.theme-ivory .genre-card-item {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.genre-card-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  border-color: var(--text-muted);
}

.genre-card-item.active {
  background: var(--text-primary);
  color: var(--bg-surface) !important;
  border-color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

body.theme-ivory .genre-card-item.active {
  background: var(--text-primary);
  color: #ffffff !important;
  border-color: var(--text-primary);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.12);
}

/* Tarjetas de Canción Enriquecidas (Estilo Spotify & Ultimate Guitar PRO) */
.explore-songs-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (min-width: 800px) {
  .explore-songs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 12px;
  }
}

.song-card {
  background: var(--bg-surface-solid) !important;
  border: 1px solid var(--border-subtle) !important;
  border-radius: 14px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.song-card:hover {
  background: var(--bg-surface-hover) !important;
  border-color: var(--accent-primary) !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.song-card-main {
  width: 100%;
  background: transparent;
  border: none;
  color: inherit;
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.song-card-header-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.song-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
}

.song-card-artist {
  font-size: 0.88rem;
  color: var(--text-secondary) !important;
  font-weight: 700;
}

.song-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.genre-badge {
  background: var(--border-subtle);
  color: var(--text-secondary) !important;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
}

.song-badge-diff {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
}

.song-badge-diff.diff-easy {
  background: rgba(0, 230, 118, 0.18);
  color: #00a854;
}
body.theme-charcoal .song-badge-diff.diff-easy {
  background: rgba(0, 230, 118, 0.18);
  color: #00e676;
}
body.theme-ivory .song-badge-diff.diff-easy {
  background: rgba(46, 125, 50, 0.12);
  color: #1b5e20;
}

.song-badge-diff.diff-med {
  background: rgba(255, 214, 0, 0.18);
  color: #d4a000;
}
body.theme-charcoal .song-badge-diff.diff-med {
  background: rgba(255, 214, 0, 0.18);
  color: #ffd600;
}
body.theme-ivory .song-badge-diff.diff-med {
  background: rgba(230, 81, 0, 0.12);
  color: #b24100;
}

.song-badge-diff.diff-hard {
  background: rgba(255, 82, 82, 0.18);
  color: #e53935;
}
body.theme-charcoal .song-badge-diff.diff-hard {
  background: rgba(255, 82, 82, 0.18);
  color: #ff5252;
}
body.theme-ivory .song-badge-diff.diff-hard {
  background: rgba(198, 40, 40, 0.12);
  color: #b71c1c;
}

.meta-pill {
.tools-header {
  margin-bottom: 20px;
}

.tools-grid-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tool-card-box {
  background: rgba(18, 18, 26, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow-md);
}

.tool-card-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.tool-card-icon {
  font-size: 1.5rem;
}

.tool-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
}

.tool-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.4;
}

/* Afinador de Oído (Ear Tuner) */
.ear-tuner-strings-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-top: 8px;
}

.btn-string-pitch {
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 800;
  padding: 12px 4px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: all var(--transition-fast);
}

.btn-string-pitch:hover, .btn-string-pitch:active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 12px var(--accent-primary-glow);
  transform: scale(1.05);
}

.string-pitch-hz {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
}

.btn-string-pitch:hover .string-pitch-hz {
  color: var(--text-primary);
}

/* Sección Acordes con IA (YouTube link placeholder UI) */
.ai-chords-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ai-youtube-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 8px;
  background: rgba(10, 10, 14, 0.8);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.88rem;
}

.ai-youtube-input:focus {
  outline: none;
  border-color: var(--accent-secondary);
}

.btn-ai-generate {
  background: linear-gradient(135deg, #00e5ff 0%, #0088ff 100%);
  color: var(--text-inverse);
  font-weight: 800;
  border: none;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.btn-ai-generate:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
}
.bottom-nav-bar {
  background: var(--bg-surface) !important;
}

.song-card-artist {
  font-size: 0.88rem;
  color: var(--text-secondary) !important;
  font-weight: 700;
}

.song-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.genre-badge {
  background: var(--border-subtle);
  color: var(--text-secondary) !important;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
}

.song-badge-diff {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
}

.song-badge-diff.diff-easy {
  background: rgba(0, 230, 118, 0.18);
  color: #00a854;
}
body.theme-charcoal .song-badge-diff.diff-easy {
  background: rgba(0, 230, 118, 0.18);
  color: #00e676;
}
body.theme-ivory .song-badge-diff.diff-easy {
  background: rgba(46, 125, 50, 0.12);
  color: #1b5e20;
}

.song-badge-diff.diff-med {
  background: rgba(255, 214, 0, 0.18);
  color: #d4a000;
}
body.theme-charcoal .song-badge-diff.diff-med {
  background: rgba(255, 214, 0, 0.18);
  color: #ffd600;
}
body.theme-ivory .song-badge-diff.diff-med {
  background: rgba(230, 81, 0, 0.12);
  color: #b24100;
}

.song-badge-diff.diff-hard {
  background: rgba(255, 82, 82, 0.18);
  color: #e53935;
}
body.theme-charcoal .song-badge-diff.diff-hard {
  background: rgba(255, 82, 82, 0.18);
  color: #ff5252;
}
body.theme-ivory .song-badge-diff.diff-hard {
  background: rgba(198, 40, 40, 0.12);
  color: #b71c1c;
}

.meta-pill {
.tools-header {
  margin-bottom: 20px;
}

.tools-grid-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tool-card-box {
  background: rgba(18, 18, 26, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow-md);
}

.tool-card-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.tool-card-icon {
  font-size: 1.5rem;
}

.tool-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
}

.tool-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.4;
}

/* Afinador de Oído (Ear Tuner) */
.ear-tuner-strings-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-top: 8px;
}

.btn-string-pitch {
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 800;
  padding: 12px 4px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: all var(--transition-fast);
}

.btn-string-pitch:hover, .btn-string-pitch:active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 12px var(--accent-primary-glow);
  transform: scale(1.05);
}

.string-pitch-hz {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
}

.btn-string-pitch:hover .string-pitch-hz {
  color: var(--text-primary);
}

/* Sección Acordes con IA (YouTube link placeholder UI) */
.ai-chords-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ai-youtube-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 8px;
  background: rgba(10, 10, 14, 0.8);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 0.88rem;
}

.ai-youtube-input:focus {
  outline: none;
  border-color: var(--accent-secondary);
}

.btn-ai-generate {
  background: linear-gradient(135deg, #00e5ff 0%, #0088ff 100%);
  color: var(--text-inverse);
  font-weight: 800;
  border: none;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.btn-ai-generate:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
}
.bottom-nav-bar {
  background: var(--bg-surface) !important;
  backdrop-filter: blur(25px) !important;
  -webkit-backdrop-filter: blur(25px) !important;
  border-top: 1px solid var(--border-subtle) !important;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.15) !important;
}
.bottom-nav-btn.active {
  color: var(--accent-primary) !important;
}

body.theme-ivory .bottom-nav-btn {
  color: #55504a !important;
}
body.theme-ivory .bottom-nav-btn.active {
  color: var(--accent-primary) !important;
  font-weight: 800 !important;
}
body.theme-ivory .bottom-nav-btn.active svg {
  transform: scale(1.1);
}

body.theme-ivory .quick-chip-label {
  color: #55504a !important;
}
body.theme-ivory .meta-pill {
  color: #55504a !important;
}

body.theme-ivory ::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
body.theme-ivory ::-webkit-scrollbar-track {
  background: transparent;
}
body.theme-ivory ::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 10px;
}
body.theme-ivory ::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   Optimizaciones Móviles Responsivas (Compact Hero & Tendencias)
   ========================================================================== */
@media (max-width: 768px) {
  .explore-hero {
    margin-bottom: 14px !important;
    gap: 6px !important;
  }

  .explore-badge-chromatic {
    display: none !important;
  }

  .explore-hero-subtitle {
    display: none !important;
  }

  .explore-hero-title {
    font-size: 1.35rem !important;
    margin-bottom: 2px !important;
  }

  .explore-quick-chips {
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    justify-content: flex-start !important;
    padding: 4px 0 8px 0 !important;
    margin-top: 4px !important;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .explore-quick-chips::-webkit-scrollbar {
    display: none;
  }

  .quick-chip-btn {
    flex-shrink: 0 !important;
    padding: 5px 12px !important;
    font-size: 0.76rem !important;
  }

  .genre-grid-mobile {
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    padding: 4px 0 8px 0 !important;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .genre-grid-mobile::-webkit-scrollbar {
    display: none;
  }

  .genre-card-item {
    flex-shrink: 0 !important;
    padding: 6px 14px !important;
    font-size: 0.8rem !important;
  }
}