/* =========================================================================
   VAULT — MOBILE EXPERIENCE
   Comprehensive mobile-first UI system for phones & tablets.
   Designed for iOS/Android PWA "Add to Home Screen" experience.
   ========================================================================= */

/* =========================================================================
   PWA STANDALONE MODE — fullscreen app experience
   ========================================================================= */
@media (display-mode: standalone) {
  /* Already running as installed PWA */
  body {
    -webkit-user-select: none;
    user-select: none;
    overscroll-behavior-y: contain;
    -webkit-tap-highlight-color: transparent;
  }

  /* Safe area insets for notched devices (iPhone X+) */
  .main-content {
    padding-top: env(safe-area-inset-top, 0);
  }

  .bottom-player {
    padding-bottom: env(safe-area-inset-bottom, 0);
  }

  .mobile-nav {
    padding-bottom: env(safe-area-inset-bottom, 8px);
  }

  /* Hide any browser chrome hints */
  .sidebar-logo,
  .up-nav-logo {
    padding-top: env(safe-area-inset-top, 0px);
  }
}


/* =========================================================================
   GLOBAL MOBILE FOUNDATIONS (all devices under 1100px)
   ========================================================================= */
@media (max-width: 1100px) {
  /* Force hardware acceleration for smoother scrolling */
  * {
    -webkit-tap-highlight-color: transparent;
  }

  html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
  }

  body {
    overscroll-behavior-y: contain;
    -webkit-overflow-scrolling: touch;
  }

  /* Better text rendering on mobile */
  h1, h2, h3, h4, h5, h6 {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  /* Bigger touch targets globally */
  button,
  a,
  [onclick],
  [role="button"],
  .clickable {
    min-height: 36px;
    min-width: 36px;
  }

  /* Fix iOS quirks */
  input, textarea, select {
    font-size: 16px !important; /* Prevents iOS zoom on focus */
    -webkit-appearance: none;
    appearance: none;
    border-radius: 0;
  }

  input[type="range"] {
    font-size: inherit !important;
  }

  /* Smooth out scrollable containers */
  .h-scroll,
  .track-list,
  .album-grid,
  .playlists-grid {
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
  }
}


/* =========================================================================
   TABLET LANDSCAPE (769px – 1100px)
   ========================================================================= */
@media (min-width: 769px) and (max-width: 1100px) {
  /* Sidebar collapses — mobile nav is the primary navigartion */
  .main-content {
    padding-top: 72px;
    padding-bottom: calc(var(--player-height) + 70px);
  }

  /* 2-column grids for some views */
  .album-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 14px;
  }

  .track-item {
    grid-template-columns: 32px 42px 1fr 80px 60px 60px;
    gap: 10px;
    padding: 8px 14px;
  }

  /* Mobile nav gets better spacing */
  .mobile-nav {
    gap: 0;
    height: 60px;
  }

  .mobile-nav-item {
    font-size: 0.62rem;
    gap: 4px;
    padding: 8px 16px;
  }

  .mobile-nav-item .icon {
    font-size: 1.2rem;
  }

  /* Bottom player — more spacious */
  .bottom-player {
    height: 74px;
    padding: 0 18px;
    gap: 14px;
  }

  .player-track-art {
    width: 50px;
    height: 50px;
    border-radius: 10px;
  }

  .player-track-title {
    font-size: 0.88rem;
  }
}


/* =========================================================================
   PHONE — CORE MOBILE UI (768px and below)
   ========================================================================= */
@media (max-width: 768px) {

  /* ── Body & layout foundations ── */
  body {
    overscroll-behavior: contain;
  }

  .main-content {
    padding-top: 62px;
    padding-bottom: calc(var(--player-height) + 62px);
  }

  /* ── Main header — floating search pill ── */
  .main-header {
    left: 10px;
    right: 10px;
    top: 10px;
    height: 46px;
    padding: 0 6px 0 14px;
    border-radius: 24px;
    gap: 6px;
    background: rgba(10, 10, 12, 0.82);
    backdrop-filter: blur(24px) saturate(1.3);
    -webkit-backdrop-filter: blur(24px) saturate(1.3);
    border: 1px solid rgba(255, 255, 255, 0.05);
  }

  .main-header-right {
    gap: 4px;
  }

  .user-menu-avatar {
    width: 28px;
    height: 28px;
    font-size: 0.62rem;
    border-width: 1.5px;
  }

  .search-bar {
    max-width: 100%;
  }

  .search-bar input {
    padding: 7px 58px 7px 30px;
    font-size: 0.8rem;
    height: 34px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.05);
  }

  .search-bar input:focus {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(232, 87, 31, 0.25);
  }

  .search-bar .search-icon {
    font-size: 0.72rem;
    left: 11px;
  }

  .view-tabs {
    display: none;
  }

  /* ── Mobile bottom navigation — premium feel ── */
  .mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--z-player);
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: linear-gradient(to top, rgba(10, 10, 12, 0.98) 60%, rgba(10, 10, 12, 0.85));
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding: 4px 8px env(safe-area-inset-bottom, 6px);
    height: auto;
    min-height: 56px;
  }

  .mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: 6px 4px;
    font-size: 0.56rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.3px;
    border-radius: 12px;
    transition: all 0.25s var(--ease-spring);
    position: relative;
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-nav-item .icon {
    font-size: 1.2rem;
    transition: all 0.25s var(--ease-spring);
  }

  .mobile-nav-item.active {
    color: var(--accent);
  }

  .mobile-nav-item.active .icon {
    transform: scale(1.1);
    filter: drop-shadow(0 2px 8px rgba(232, 87, 31, 0.3));
  }

  /* Active indicator dot */
  .mobile-nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 1px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 6px rgba(232, 87, 31, 0.5);
  }

  /* Ripple-like press effect */
  .mobile-nav-item:active {
    transform: scale(0.92);
    opacity: 0.8;
  }


  /* ── Bottom Player — compact phone bar ── */
  .bottom-player {
    position: fixed;
    bottom: 56px; /* above mobile nav */
    left: 0;
    right: 0;
    height: 64px;
    z-index: calc(var(--z-player) + 1);
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 0 10px;
    background: linear-gradient(180deg, rgba(18, 18, 21, 0.96), rgba(14, 14, 16, 0.99));
    backdrop-filter: blur(28px) saturate(1.3);
    -webkit-backdrop-filter: blur(28px) saturate(1.3);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 16px 16px 0 0;
    box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.4);
  }

  /* Mini progress bar on top of player */
  .bottom-player::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.03);
  }

  .player-track-info {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
  }

  .player-track-art {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    overflow: hidden;
  }

  .player-track-details {
    min-width: 0;
    max-width: 150px;
  }

  .player-track-title {
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .player-track-artist {
    font-size: 0.68rem;
    color: var(--text-secondary);
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .player-track-info .btn-icon {
    display: none;
  }

  /* Player controls — just play/pause + skip */
  .player-controls {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0;
  }

  .player-buttons {
    display: flex;
    align-items: center;
    gap: 4px;
  }

  .player-btn {
    font-size: 0.9rem;
    padding: 6px;
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .player-btn.play-pause {
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(232, 87, 31, 0.25);
  }

  .player-btn.play-pause:active {
    transform: scale(0.9);
  }

  .player-btn.skip {
    color: var(--text-secondary);
  }

  #shuffleBtn,
  #repeatBtn {
    display: none;
  }

  .player-progress {
    display: none;
  }

  .player-extra {
    display: flex;
    align-items: center;
    gap: 2px;
  }

  .player-extra .volume-control {
    display: none;
  }

  #queueToggle {
    display: none;
  }

  #fullscreenBtn {
    display: flex;
    min-width: 36px;
    min-height: 36px;
  }


  /* ── Track list — mobile optimized rows ── */
  .track-list-header {
    display: none; /* Hide column headers on mobile */
  }

  .track-item {
    grid-template-columns: 24px 40px 1fr auto;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 12px;
    min-height: 56px;
    align-items: center;
    transition: background 0.15s;
  }

  .track-item:active {
    background: rgba(255, 255, 255, 0.03);
  }

  .track-number {
    font-size: 0.72rem;
    color: var(--text-muted);
    width: 24px;
    text-align: center;
  }

  .track-thumb {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
  }

  .track-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .track-info {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .track-title-text {
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
  }

  .track-artist-text {
    font-size: 0.72rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Hide less important columns */
  .track-album-text,
  .track-genre,
  .track-plays {
    display: none;
  }

  .track-duration {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    white-space: nowrap;
  }

  .track-actions {
    display: flex;
    gap: 2px;
  }

  .track-action-btn {
    min-width: 32px;
    min-height: 32px;
    font-size: 0.78rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
  }


  /* ── Album grid — phone-friendly cards ── */
  .album-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 10px;
    padding: 0;
  }

  .album-card {
    padding: 8px;
    border-radius: 14px;
    transition: transform 0.2s var(--ease-spring);
  }

  .album-card:active {
    transform: scale(0.96);
  }

  .album-cover {
    border-radius: 10px;
    aspect-ratio: 1;
    overflow: hidden;
  }

  .album-info {
    padding: 6px 2px 0;
  }

  .album-title {
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.3;
  }

  .album-artist {
    font-size: 0.68rem;
    color: var(--text-secondary);
  }


  /* ── Artist grid — tighter phone grid ── */
  .artist-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .artist-card {
    padding: 12px;
    border-radius: 14px;
  }

  .artist-card:active {
    transform: scale(0.96);
  }

  .artist-avatar {
    width: 64px;
    height: 64px;
    margin-bottom: 8px;
  }

  .artist-name {
    font-size: 0.78rem;
  }

  .artist-meta {
    font-size: 0.62rem;
  }


  /* ── Genre grid ── */
  .genre-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .genre-card {
    padding: 18px 14px;
    border-radius: 14px;
    min-height: 80px;
  }

  .genre-card:active {
    transform: scale(0.96);
  }

  .genre-name {
    font-size: 0.85rem;
  }

  .genre-count {
    font-size: 0.68rem;
  }


  /* ── Sort bar — scrollable pills ── */
  .sort-bar {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
    gap: 5px;
  }

  .sort-bar::-webkit-scrollbar {
    display: none;
  }

  .sort-pill {
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 0.7rem;
    padding: 5px 12px;
    border-radius: 100px;
  }


  /* ── Hero banner — compact mobile hero ── */
  .hero-banner {
    margin: 10px 10px 0;
    height: 160px;
    border-radius: 18px;
  }

  .hero-banner-title {
    font-size: 1.35rem;
    letter-spacing: -0.5px;
  }

  .hero-banner-desc {
    display: none;
  }


  /* ── Stats overview ── */
  .stats-overview {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .stat-mini {
    padding: 14px;
    border-radius: 12px;
  }


  /* ── Section headers ── */
  .section-header {
    margin-bottom: 10px;
    padding: 0 2px;
  }

  .section-title {
    font-size: 1rem;
  }

  .see-all-btn {
    font-size: 0.72rem;
    padding: 4px 12px;
  }

  .content-section {
    padding: 16px 12px 0;
  }


  /* ── Horizontal scroll containers ── */
  .h-scroll {
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    gap: 10px;
    padding-left: 12px;
    padding-right: 12px;
  }

  .h-scroll > * {
    scroll-snap-align: start;
  }

  .h-scroll-wrap::after {
    width: 30px;
    background: linear-gradient(to left, var(--bg-primary), transparent);
  }


  /* ── Fullscreen Player — full mobile experience ── */
  .fullscreen-player,
  .fs-player {
    display: flex;
    flex-direction: column;
  }

  .fs-topbar {
    padding: 12px 16px;
  }

  .fs-main {
    padding: 0 20px 24px;
    max-width: 100%;
  }

  .fs-art,
  .fs-art-wrapper {
    width: 72vw;
    max-width: 300px;
    height: auto;
    aspect-ratio: 1;
    border-radius: 20px;
    margin: 0 auto 24px;
  }

  .fs-art-glow {
    border-radius: 20px;
    filter: blur(40px);
    opacity: 0.25;
  }

  .fs-title {
    font-size: 1.35rem;
    letter-spacing: -0.5px;
    text-align: center;
  }

  .fs-artist {
    font-size: 0.88rem;
    text-align: center;
  }

  .fs-album {
    font-size: 0.78rem;
    text-align: center;
  }

  .fs-progress {
    margin: 16px 0;
  }

  .fs-transport {
    gap: 18px;
    justify-content: center;
  }

  .fs-play-btn {
    width: 60px;
    height: 60px;
    font-size: 1.25rem;
    box-shadow: 0 8px 32px rgba(232, 87, 31, 0.3);
  }

  .fs-play-btn:active {
    transform: scale(0.9);
  }

  .fs-btn {
    min-width: 40px;
    min-height: 40px;
    font-size: 1rem;
  }

  .fs-vol-slider,
  .fs-volume {
    display: none;
  }

  .fs-hint {
    display: none;
  }

  .fs-actions {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
  }

  .fs-action-btn,
  .action-btn {
    min-width: 44px;
    min-height: 44px;
    padding: 8px 16px;
    font-size: 0.76rem;
  }


  /* ── Command palette — mobile fullscreen ── */
  .cmd-palette-overlay {
    padding: 8px;
    align-items: flex-start;
    padding-top: 10vh;
  }

  .cmd-palette {
    max-width: 100%;
    border-radius: 18px;
    max-height: 75vh;
  }

  .cmd-palette-input {
    font-size: 0.92rem;
    padding: 14px 12px;
  }

  .cmd-item {
    padding: 10px 14px;
    gap: 10px;
    min-height: 44px;
  }

  .cmd-item-kbd {
    display: none; /* Hide keyboard shortcuts on mobile */
  }


  /* ── Context menu — bottom sheet style ── */
  .context-menu {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    top: auto !important;
    max-width: 100% !important;
    width: 100% !important;
    border-radius: 20px 20px 0 0;
    padding: 8px 6px env(safe-area-inset-bottom, 8px);
    animation: slideUpSheet 0.3s var(--ease-out);
    max-height: 70vh;
    overflow-y: auto;
    box-shadow: 0 -16px 48px rgba(0, 0, 0, 0.5);
    background: rgba(20, 20, 24, 0.98);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
  }

  @keyframes slideUpSheet {
    from {
      transform: translateY(100%);
      opacity: 0.5;
    }
    to {
      transform: translateY(0);
      opacity: 1;
    }
  }

  .context-menu::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.15);
    margin: 4px auto 10px;
  }

  .ctx-item {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.88rem;
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background 0.15s;
  }

  .ctx-item:active {
    background: rgba(255, 255, 255, 0.05);
  }

  .ctx-item i {
    width: 20px;
    text-align: center;
    font-size: 0.85rem;
  }

  .ctx-divider {
    margin: 4px 16px;
    height: 1px;
    background: rgba(255, 255, 255, 0.04);
  }


  /* ── Playlist modal — mobile bottom sheet ── */
  .playlist-modal-overlay {
    align-items: flex-end;
    padding: 0;
  }

  .playlist-modal {
    border-radius: 22px 22px 0 0;
    max-width: 100%;
    max-height: 85vh;
    animation: slideUpSheet 0.35s var(--ease-out);
  }

  .playlist-modal::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.15);
    margin: 10px auto 0;
  }

  .playlist-modal .modal-header {
    padding: 16px 24px 0;
  }

  .playlist-modal .modal-body {
    padding: 16px 24px;
  }

  .playlist-modal .modal-footer {
    padding: 0 24px 24px;
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  }

  .playlist-modal .form-input {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: 14px;
  }

  .playlist-picker-item {
    padding: 14px 16px;
    min-height: 52px;
  }


  /* ── Playlists grid — 2-column phone grid ── */
  .playlists-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .playlist-card-art {
    border-radius: 14px;
  }

  .playlist-card-name {
    font-size: 0.82rem;
  }

  .playlist-card-meta {
    font-size: 0.68rem;
  }


  /* ── Playlist hero — stacked mobile layout ── */
  .playlist-hero-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .playlist-hero-art {
    width: 160px;
    height: 160px;
    border-radius: 18px;
    align-self: center;
  }

  .playlist-hero-info {
    text-align: center;
    width: 100%;
  }

  .playlist-hero-title {
    font-size: 1.6rem;
    text-align: center;
  }

  .playlist-hero-desc {
    text-align: center;
  }

  .playlist-hero-meta {
    justify-content: center;
  }

  .playlist-hero-actions {
    justify-content: center;
  }


  /* ── Buttons — more tappable on mobile ── */
  .btn {
    min-height: 40px;
    min-width: 40px;
    font-size: 0.82rem;
  }

  .btn-sm {
    min-height: 36px;
    padding: 8px 16px;
    font-size: 0.78rem;
  }

  .btn-primary {
    box-shadow: 0 4px 16px rgba(232, 87, 31, 0.2);
  }

  .btn:active {
    transform: scale(0.96);
  }


  /* ── Toast notifications — mobile placement ── */
  .toast-container {
    bottom: calc(var(--player-height) + 70px) !important;
    left: 12px !important;
    right: 12px !important;
  }

  .toast {
    border-radius: 14px;
    padding: 12px 16px;
    font-size: 0.82rem;
    width: 100%;
    max-width: none;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  }


  /* ── User menu — mobile optimized ── */
  .user-menu-dropdown {
    position: fixed !important;
    top: auto !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    border-radius: 20px 20px 0 0;
    animation: slideUpSheet 0.3s var(--ease-out);
    padding: 8px 6px env(safe-area-inset-bottom, 8px);
    max-width: 100% !important;
    width: 100% !important;
    box-shadow: 0 -16px 48px rgba(0, 0, 0, 0.5);
  }

  .user-menu-dropdown::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.15);
    margin: 4px auto 10px;
  }

  .user-menu-item {
    padding: 12px 16px;
    min-height: 44px;
    border-radius: 12px;
    font-size: 0.88rem;
  }


  /* ── Loading state ── */
  .loading {
    min-height: 30vh;
  }

  .spinner {
    width: 36px;
    height: 36px;
    border-width: 3px;
  }


  /* ── Empty states ── */
  .empty-state,
  .no-results {
    padding: 40px 20px;
  }

  .empty-state-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
  }

  .empty-state h3 {
    font-size: 1.1rem;
  }

  .empty-state p {
    font-size: 0.82rem;
  }


  /* ── View section headers — mobile ── */
  .view-section {
    padding: 0 0 12px;
  }

  .view-section-header {
    padding: 0 2px;
    margin-bottom: 14px;
  }

  .view-section-header h2 {
    font-size: 1.05rem;
  }

  .view-section-header h2 .section-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-size: 0.68rem;
  }


  /* ── Queue panel — mobile overlay ── */
  .queue-panel {
    position: fixed;
    inset: 0;
    width: 100% !important;
    max-width: 100% !important;
    border-radius: 0;
    z-index: 10001;
    animation: slideUpSheet 0.3s var(--ease-out);
  }

  .queue-header {
    padding: 16px 20px;
    min-height: 52px;
  }

  .queue-item {
    padding: 10px 16px;
    min-height: 52px;
  }


  /* ── Mobile more menu (bottom sheet) ── */
  .mobile-more-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(20, 20, 24, 0.98);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border-radius: 20px 20px 0 0;
    padding: 8px 12px env(safe-area-inset-bottom, 12px);
    z-index: 10002;
    animation: slideUpSheet 0.3s var(--ease-out);
    box-shadow: 0 -16px 48px rgba(0, 0, 0, 0.5);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }

  .mobile-more-sheet::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.15);
    margin: 4px auto 12px;
  }

  .mobile-more-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border-radius: 14px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.15s;
  }

  .mobile-more-item:active {
    background: rgba(255, 255, 255, 0.04);
  }

  .mobile-more-item i {
    width: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.92rem;
  }

  /* Overlay behind sheets */
  .sheet-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 10001;
    animation: fadeIn 0.2s ease;
  }
}


/* =========================================================================
   SMALL PHONES (480px and below)
   ========================================================================= */
@media (max-width: 480px) {

  /* ── Layout tightening ── */
  .main-content {
    padding-top: 58px;
  }

  .main-header {
    left: 8px;
    right: 8px;
    top: 8px;
    height: 42px;
    padding: 0 4px 0 12px;
  }

  .search-bar input {
    padding: 6px 48px 6px 26px;
    font-size: 0.76rem;
    height: 32px;
  }

  .search-bar .search-icon {
    font-size: 0.65rem;
    left: 9px;
  }

  .user-menu-avatar {
    width: 26px;
    height: 26px;
    font-size: 0.58rem;
  }


  /* ── Track list — ultra compact ── */
  .track-item {
    grid-template-columns: 20px 36px 1fr auto;
    gap: 8px;
    padding: 6px 8px;
    min-height: 50px;
  }

  .track-number {
    font-size: 0.65rem;
    width: 20px;
  }

  .track-thumb {
    width: 36px;
    height: 36px;
    border-radius: 7px;
  }

  .track-title-text {
    font-size: 0.8rem;
  }

  .track-artist-text {
    font-size: 0.68rem;
  }

  .track-duration {
    font-size: 0.65rem;
  }

  .track-actions .track-action-btn {
    min-width: 28px;
    min-height: 28px;
    font-size: 0.72rem;
  }


  /* ── Album grid — 2 columns tight ── */
  .album-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .album-card {
    padding: 6px;
    border-radius: 12px;
  }

  .album-cover {
    border-radius: 9px;
  }

  .album-info {
    padding: 5px 2px 0;
  }

  .album-title {
    font-size: 0.76rem;
  }

  .album-artist {
    font-size: 0.64rem;
  }


  /* ── Artist grid — 2 columns ── */
  .artist-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .artist-card {
    padding: 10px;
    border-radius: 12px;
  }

  .artist-avatar {
    width: 52px;
    height: 52px;
  }

  .artist-name {
    font-size: 0.72rem;
  }


  /* ── Genre grid ── */
  .genre-grid {
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }

  .genre-card {
    padding: 14px 10px;
    min-height: 70px;
    border-radius: 12px;
  }


  /* ── Hero banner ── */
  .hero-banner {
    height: 135px;
    margin: 8px;
    border-radius: 14px;
  }

  .hero-banner-title {
    font-size: 1.15rem;
  }

  .hero-banner-label {
    font-size: 0.55rem;
  }

  .content-section {
    padding: 10px 8px 0;
  }


  /* ── Bottom player — slimmer ── */
  .bottom-player {
    height: 58px;
    padding: 0 8px;
    gap: 8px;
    border-radius: 14px 14px 0 0;
  }

  .player-track-art {
    width: 40px;
    height: 40px;
    border-radius: 9px;
  }

  .player-track-details {
    max-width: 100px;
  }

  .player-track-title {
    font-size: 0.76rem;
  }

  .player-track-artist {
    font-size: 0.62rem;
  }

  .player-btn.play-pause {
    width: 36px;
    height: 36px;
    font-size: 0.82rem;
  }

  .player-btn.skip {
    min-width: 32px;
    min-height: 32px;
    font-size: 0.82rem;
  }


  /* ── Mobile nav — ultra compact ── */
  .mobile-nav {
    min-height: 52px;
    padding: 3px 4px env(safe-area-inset-bottom, 4px);
  }

  .mobile-nav-item {
    font-size: 0.5rem;
    padding: 4px 3px;
    gap: 2px;
  }

  .mobile-nav-item .icon {
    font-size: 1.05rem;
  }


  /* ── Fullscreen player — compact phone ── */
  .fs-art,
  .fs-art-wrapper {
    width: 60vw;
    max-width: 250px;
  }

  .fs-title {
    font-size: 1.2rem;
  }

  .fs-artist {
    font-size: 0.82rem;
  }

  .fs-play-btn {
    width: 54px;
    height: 54px;
    font-size: 1.15rem;
  }

  .fs-btn {
    min-width: 36px;
    min-height: 36px;
    font-size: 0.92rem;
  }

  .fs-transport {
    gap: 14px;
  }


  /* ── Playlist grid — keep 2 columns ── */
  .playlists-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .playlist-card-art {
    border-radius: 12px;
  }

  .playlist-card-name {
    font-size: 0.78rem;
  }


  /* ── Playlist hero — smaller art ── */
  .playlist-hero-art {
    width: 130px;
    height: 130px;
    border-radius: 16px;
  }

  .playlist-hero-title {
    font-size: 1.3rem;
  }


  /* ── Sort bar ── */
  .sort-bar {
    gap: 4px;
  }

  .sort-pill {
    font-size: 0.65rem;
    padding: 4px 10px;
  }


  /* ── Section headers ── */
  .section-title {
    font-size: 0.92rem;
  }

  .view-section-header h2 {
    font-size: 0.95rem;
  }


  /* ── Stats ── */
  .stats-overview {
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }

  .stat-mini {
    padding: 11px;
    border-radius: 10px;
  }

  .stat-mini-value {
    font-size: 0.95rem;
  }

  .stat-mini-label {
    font-size: 0.58rem;
  }


  /* ── H-scroll ── */
  .h-scroll {
    gap: 8px;
    padding-left: 8px;
    padding-right: 8px;
  }


  /* ── Auth pages ── */
  .auth-card {
    padding: 28px 20px;
    border-radius: 18px;
  }


  /* ── Command palette ── */
  .cmd-palette {
    border-radius: 16px;
    max-width: 100%;
  }

  .cmd-item {
    padding: 10px 12px;
    font-size: 0.82rem;
  }
}


/* =========================================================================
   TINY PHONES (380px and below — iPhone SE, etc.)
   ========================================================================= */
@media (max-width: 380px) {
  .main-header {
    left: 6px;
    right: 6px;
    height: 40px;
  }

  .search-bar input {
    font-size: 0.72rem;
    height: 30px;
  }

  .album-grid {
    gap: 6px;
  }

  .album-card {
    padding: 5px;
    border-radius: 10px;
  }

  .album-title {
    font-size: 0.72rem;
  }

  .track-item {
    grid-template-columns: 18px 32px 1fr auto;
    gap: 6px;
    padding: 5px 6px;
    min-height: 44px;
  }

  .track-thumb {
    width: 32px;
    height: 32px;
  }

  .track-title-text {
    font-size: 0.76rem;
  }

  .genre-card {
    padding: 12px 8px;
    min-height: 60px;
  }

  .genre-name {
    font-size: 0.78rem;
  }

  .bottom-player {
    height: 54px;
    gap: 6px;
  }

  .player-track-art {
    width: 36px;
    height: 36px;
  }

  .player-track-details {
    max-width: 80px;
  }

  .player-track-title {
    font-size: 0.72rem;
  }

  .player-btn.play-pause {
    width: 32px;
    height: 32px;
  }

  .mobile-nav-item {
    font-size: 0.48rem;
    gap: 1px;
  }

  .mobile-nav-item .icon {
    font-size: 0.95rem;
  }

  .fs-art,
  .fs-art-wrapper {
    width: 55vw;
    max-width: 200px;
  }

  .fs-title {
    font-size: 1.05rem;
  }

  .fs-play-btn {
    width: 48px;
    height: 48px;
  }

  .playlist-hero-art {
    width: 110px;
    height: 110px;
  }

  .playlist-hero-title {
    font-size: 1.15rem;
  }
}


/* =========================================================================
   LANDSCAPE PHONE (short viewport)
   ========================================================================= */
@media (max-height: 600px) and (max-width: 900px) {
  .fs-art,
  .fs-art-wrapper {
    width: 35vh;
    max-width: 200px;
  }

  .fs-main {
    flex-direction: row;
    align-items: center;
    gap: 24px;
    padding: 0 24px;
  }

  .fs-title {
    font-size: 1.1rem;
    text-align: left;
  }

  .fs-artist {
    text-align: left;
  }

  .fs-play-btn {
    width: 48px;
    height: 48px;
  }

  .mobile-nav {
    min-height: 48px;
  }
}


/* =========================================================================
   TOUCH INTERACTION ENHANCEMENTS
   ========================================================================= */
@media (hover: none) and (pointer: coarse) {
  /* Remove hover-only effects on touch devices */
  .album-card:hover {
    transform: none;
  }

  .track-item:hover {
    background: transparent;
  }

  .artist-card:hover {
    transform: none;
  }

  .genre-card:hover {
    transform: none;
  }

  .playlist-card:hover {
    transform: none;
  }

  .playlist-card:hover .playlist-card-overlay {
    opacity: 1; /* Always show overlay on touch */
  }

  .playlist-card:hover .playlist-card-play {
    opacity: 1;
    transform: scale(1);
  }

  .playlist-card:hover .playlist-card-count {
    opacity: 1;
  }

  /* Show action buttons always (no hover reveal) */
  .track-actions {
    opacity: 1;
  }

  .playlist-track-remove {
    opacity: 0.5;
  }

  /* Replace hover with active states */
  .album-card:active {
    transform: scale(0.96);
    transition: transform 0.1s;
  }

  .playlist-card:active {
    transform: scale(0.97);
    transition: transform 0.1s;
  }

  .genre-card:active {
    transform: scale(0.96);
  }

  .artist-card:active {
    transform: scale(0.96);
  }

  /* Album play overlay — always visible on touch */
  .album-play-btn {
    opacity: 0.7;
    transform: scale(0.8);
  }

  /* Home cards — show play buttons */
  .home-track-card-overlay,
  .home-album-card-overlay {
    opacity: 1;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.5) 0%, transparent 60%);
  }

  .home-track-card-play,
  .home-album-card-play {
    opacity: 0.8;
    transform: scale(0.85);
  }

  /* Scrollbar hiding on touch */
  ::-webkit-scrollbar {
    width: 0;
    height: 0;
  }

  * {
    scrollbar-width: none;
  }
}


/* =========================================================================
   SAFE AREA AWARE padding (iPhone notch / dynamic island)
   ========================================================================= */
@supports (padding: env(safe-area-inset-top)) {
  @media (max-width: 768px) {
    .main-header {
      top: calc(10px + env(safe-area-inset-top, 0px));
    }

    .main-content {
      padding-top: calc(62px + env(safe-area-inset-top, 0px));
    }

    .mobile-nav {
      padding-bottom: env(safe-area-inset-bottom, 6px);
    }

    .bottom-player {
      bottom: calc(56px + env(safe-area-inset-bottom, 0px));
    }

    .context-menu {
      padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    }

    .mobile-more-sheet {
      padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    }

    .playlist-modal .modal-footer {
      padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    }

    .fullscreen-player {
      padding-top: env(safe-area-inset-top, 0);
    }
  }
}


/* =========================================================================
   DARK MODE PREFERENCE (auto for system theme)
   ========================================================================= */
@media (prefers-color-scheme: dark) {
  /* Already dark — but ensure PWA has proper meta */
  :root {
    color-scheme: dark;
  }
}