/* =============================================
   SheetApp — layout.css
   Sidebar, Toolbar, Main Layout
   ============================================= */

/* ---- SIDEBAR ---- */
.sidebar {
  width: var(--sidebar-w);
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  box-shadow: 2px 0 12px rgba(109,40,217,.06);
  transition: width var(--transition), transform var(--transition);
  z-index: 100;
  flex-shrink: 0;
  overflow: hidden;
}
.sidebar.collapsed { width: 60px; }
.sidebar.collapsed .logo-text,
.sidebar.collapsed .sidebar-search,
.sidebar.collapsed .sidebar-actions,
.sidebar.collapsed .song-list-container { display: none; }

.sidebar-header { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1rem; border-bottom: 1px solid var(--border); min-height: 60px; }
.logo { display: flex; align-items: center; gap: .6rem; }
.logo-icon { font-size: 1.5rem; }
.logo-text { font-size: 1.1rem; font-weight: 700; background: linear-gradient(135deg, var(--accent), #7c3aed); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; letter-spacing: -.3px; }

.sidebar-search { padding: .75rem 1rem .5rem; }
.search-box { display: flex; align-items: center; gap: .5rem; background: var(--bg-overlay); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .45rem .75rem; transition: border-color var(--transition); }
.search-box:focus-within { border-color: var(--border-active); }
.search-icon { width: 14px; height: 14px; color: var(--text-muted); flex-shrink: 0; }
#search-input { background: none; border: none; outline: none; color: var(--text-primary); font-size: .875rem; width: 100%; }
#search-input::placeholder { color: var(--text-muted); }

.sidebar-actions { padding: .5rem 1rem; }
.song-list-container { flex: 1; overflow-y: auto; padding: .25rem .5rem .5rem; }
.sidebar-tab-content { height: 100%; display: flex; flex-direction: column; }
.song-list { display: flex; flex-direction: column; gap: .25rem; }

.song-item { display: flex; align-items: center; gap: .65rem; padding: .65rem .75rem; border-radius: var(--radius-sm); cursor: pointer; transition: background var(--transition), transform var(--transition); border: 1px solid transparent; position: relative; overflow: hidden; }
.song-item::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent); border-radius: 0 2px 2px 0; opacity: 0; transition: opacity var(--transition); }
.song-item:hover { background: var(--bg-overlay); }
.song-item:hover::before { opacity: .5; }
.song-item.active { background: rgba(109,40,217,.08); border-color: rgba(109,40,217,.25); }
.song-item.active::before { opacity: 1; }
.song-item-icon { font-size: 1.1rem; width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; background: var(--bg-raised); border-radius: var(--radius-xs); flex-shrink: 0; }
.song-item-info { flex: 1; min-width: 0; }
.song-item-title { font-size: .825rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-bottom: .15rem; }
.song-item-meta { font-size: .7rem; color: var(--text-muted); }
.song-item-actions { display: flex; gap: .25rem; opacity: 0; transition: opacity var(--transition); }
.song-item:hover .song-item-actions { opacity: 1; }
.song-item-num { font-size: .65rem; font-family: var(--font-mono); color: var(--text-muted); font-weight: 600; min-width: 28px; flex-shrink: 0; text-align: right; letter-spacing: .3px; padding-right: 2px; }
.song-item.active .song-item-num { color: var(--accent); }

.empty-state { text-align: center; padding: 2rem 1rem; color: var(--text-muted); }
.empty-icon { font-size: 2.5rem; display: block; margin-bottom: .75rem; opacity: .5; }
.empty-state p { font-size: .875rem; margin-bottom: .25rem; }

.library-count-badge { display: inline-flex; align-items: center; justify-content: center; background: rgba(167,139,250,.18); color: var(--accent); border: 1px solid rgba(167,139,250,.3); border-radius: 99px; font-size: .65rem; font-weight: 700; font-family: var(--font-mono); padding: .1em .5em; letter-spacing: .3px; line-height: 1.6; min-width: 28px; text-align: center; }

.quick-jump { padding: .4rem 1rem .3rem; border-bottom: 1px solid var(--border); }
.quick-jump-label { font-size: .6rem; text-transform: uppercase; letter-spacing: .5px; color: var(--text-muted); font-weight: 600; display: block; margin-bottom: .3rem; }
.quick-jump-btns { display: flex; flex-wrap: wrap; gap: .3rem; }
.quick-jump-btn { background: var(--bg-overlay); border: 1px solid var(--border); border-radius: var(--radius-xs); color: var(--text-muted); font-size: .6rem; font-family: var(--font-mono); font-weight: 600; padding: .2rem .4rem; cursor: pointer; transition: all var(--transition); white-space: nowrap; }
.quick-jump-btn:hover { background: var(--bg-raised); color: var(--text-secondary); }
.quick-jump-btn.active { background: rgba(167,139,250,.2); border-color: rgba(167,139,250,.5); color: var(--accent); }
.quick-jump-all { border-style: dashed; }

/* ---- MAIN LAYOUT ---- */
.main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; min-height: 0; overflow: hidden; }

/* ---- TOOLBAR ---- */
.toolbar { height: var(--toolbar-h); background: var(--bg-surface); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 1.5rem; gap: 1rem; flex-shrink: 0; backdrop-filter: blur(10px); position: relative; z-index: 50; }
.toolbar-left { flex: 1; min-width: 0; }
.song-info { display: flex; align-items: center; gap: .65rem; min-width: 0; }
.song-title { font-size: 1rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text-primary); }
.song-key-badge { background: var(--accent); color: #fff; font-size: .7rem; font-weight: 600; padding: .2em .6em; border-radius: 99px; white-space: nowrap; letter-spacing: .5px; }
.toolbar-controls { display: flex; align-items: center; gap: 1.25rem; flex-shrink: 0; }
.control-group { display: flex; align-items: center; gap: .5rem; }
.control-label { font-size: .7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .6px; font-weight: 500; white-space: nowrap; }
.toolbar-left.in-setlist { background: rgba(167, 139, 250, 0.1); border-radius: var(--radius-md); padding: 0.2rem 0.5rem; border: 1px dashed var(--accent); }

.nav-arrows { display: flex; gap: .15rem; margin-right: .5rem; flex-shrink: 0; }
.nav-arrows .icon-btn { width: 28px; height: 28px; background: var(--bg-overlay); border: 1px solid var(--border); border-radius: var(--radius-xs); }
.nav-arrows .icon-btn:hover:not(:disabled) { background: var(--bg-raised); border-color: var(--border-active); }
.nav-arrows .icon-btn:disabled { opacity: .3; }

.transpose-controls { display: flex; align-items: center; background: var(--bg-overlay); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.transpose-btn { width: 30px; height: 30px; border-radius: 0 !important; flex-shrink: 0; }
.transpose-btn:hover:not(:disabled) { background: var(--bg-raised); }
.transpose-display { min-width: 36px; text-align: center; font-size: .85rem; font-weight: 600; font-family: var(--font-mono); color: var(--accent); padding: 0 .25rem; }

.zoom-slider-wrap { display: flex; align-items: center; gap: .4rem; }
.zoom-icon-sm { width: 14px; height: 14px; color: var(--text-muted); }
#zoom-slider { -webkit-appearance: none; appearance: none; width: 100px; height: 4px; background: var(--bg-raised); border-radius: 2px; outline: none; cursor: pointer; transition: background var(--transition); }
#zoom-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; box-shadow: 0 0 8px var(--accent-glow); transition: transform var(--transition); }
#zoom-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
#zoom-slider:disabled { opacity: .4; cursor: not-allowed; }

.toggle-switch { display: flex; align-items: center; cursor: pointer; position: relative; }
.toggle-switch input { position: absolute; opacity: 0; width: 0; }
.toggle-track { width: 38px; height: 22px; background: var(--bg-raised); border: 1px solid var(--border); border-radius: 99px; display: flex; align-items: center; padding: 2px; transition: background var(--transition), border-color var(--transition); }
.toggle-switch input:checked ~ .toggle-track { background: var(--accent-dim); border-color: var(--accent); }
.toggle-thumb { width: 16px; height: 16px; background: #fff; border-radius: 50%; transition: transform var(--transition); box-shadow: 0 1px 4px rgba(0,0,0,.3); }
.toggle-switch input:checked ~ .toggle-track .toggle-thumb { transform: translateX(16px); }
.toggle-switch input:disabled ~ .toggle-track { opacity: .4; cursor: not-allowed; }

/* Fullscreen */
.sidebar.fs-hidden { transform: translateX(-100%); width: 0 !important; overflow: hidden; border: none; }
body.fullscreen-mode .toolbar { height: 52px; padding: 0 1rem; }
body.fullscreen-mode .osmd-container { max-width: 100%; padding: 1rem 3rem; }

/* =============================================
   RESPONSIVE — Tablet & Mobile
   ============================================= */

/* --- Tablet (≤ 1024px) --- */
@media (max-width: 1024px) {
  /* Toolbar: scroll ngang, không wrap */
  .toolbar-controls {
    overflow-x: auto;
    overscroll-behavior-x: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-right: 1rem;
    gap: .75rem;
    flex-shrink: 0;
    flex-wrap: nowrap;
    mask-image: linear-gradient(to right, black 85%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, black 85%, transparent 100%);
  }
  .toolbar-controls::-webkit-scrollbar { display: none; }

  /* Ẩn label chữ, giữ icon */
  .control-label { display: none; }
  .btn-sm .btn-text { display: none; } /* text trong nút */

  /* Page bar scroll ngang */
  .page-bar {
    overflow-x: auto;
    scrollbar-width: none;
    flex-wrap: nowrap !important;
    min-height: 42px;
  }
  .page-bar::-webkit-scrollbar { display: none; }
  .page-bar-left, .page-bar-right {
    flex-shrink: 0;
    flex-wrap: nowrap;
  }
  #zoom-slider { width: 70px; }
}

/* --- Mobile (≤ 768px) --- */
@media (max-width: 768px) {
  /* Sidebar: overlay toàn màn hình */
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    z-index: 300;
    width: 280px;
    transform: translateX(0);
    transition: transform .25s ease, box-shadow .25s ease;
    box-shadow: 4px 0 24px rgba(0,0,0,.25);
  }
  .sidebar.mobile-hidden {
    transform: translateX(-100%);
    box-shadow: none;
  }
  .main-content { margin-left: 0; }

  /* Toolbar height giảm xuống */
  .toolbar {
    height: auto;
    min-height: 48px;
    padding: 0 .75rem;
    gap: .5rem;
    flex-wrap: nowrap;
    overflow: hidden;
  }
  .toolbar-left { min-width: 0; flex: 1; }
  .song-title { font-size: .8rem; }
  .song-key-badge { font-size: .65rem; }
  .nav-arrows { margin-right: .25rem; }

  /* Controls: ẩn hết text trong nút, chỉ hiện icon */
  .toolbar-controls {
    gap: .4rem;
    padding-right: .5rem;
    overflow-x: auto;
    scrollbar-width: none;
    flex-wrap: nowrap;
    flex-shrink: 0;
    mask-image: none; -webkit-mask-image: none;
  }
  .toolbar-controls::-webkit-scrollbar { display: none; }

  /* Ẩn các nút ít quan trọng trên mobile hẳn */
  #btn-session-panel, #btn-print { display: none; }

  /* Các nút trong toolbar: thu nhỏ, icon only */
  .btn-sm { padding: .3rem .4rem; font-size: .75rem; gap: 0; }
  .btn-sm svg { width: 15px; height: 15px; margin: 0; }
  /* Ẩn text của nút, chỉ giữ SVG */
  .toolbar-controls .btn-sm > *:not(svg):not(select) { display: none; }
  .toolbar-controls select { max-width: 52px; padding: .15rem .2rem; font-size: .7rem; }

  /* Page bar */
  .page-bar {
    overflow-x: auto;
    scrollbar-width: none;
    flex-wrap: nowrap !important;
    padding: .25rem .5rem;
    gap: .5rem;
    min-height: 40px;
  }
  .page-bar::-webkit-scrollbar { display: none; }
  .page-bar-left, .page-bar-right {
    flex-shrink: 0;
    flex-wrap: nowrap;
    gap: .4rem;
  }
  #zoom-slider { width: 60px; }
  .chord-set-bar { gap: .3rem; }
  .chord-set-label { display: none; }
  .chord-set-select { max-width: 80px; font-size: .7rem; }

  /* Transpose nút */
  .transpose-btn { width: 26px; height: 26px; }
  .transpose-display { min-width: 26px; font-size: .8rem; }
  #btn-transpose-reset { display: none; } /* ẩn nút Reset trên mobile */
  #btn-new-chord-set { font-size: .65rem; padding: .15rem .35rem; }
}

/* --- Small phone (≤ 480px) --- */
@media (max-width: 480px) {
  .toolbar { padding: 0 .5rem; gap: .3rem; }
  .nav-arrows .icon-btn { width: 24px; height: 24px; }
  .song-title { font-size: .75rem; }
  
  /* Page bar: page indicator ngắn gọn */
  .page-indicator { font-size: .7rem; }
  
  /* Ẩn thêm các nút phụ */
  #btn-mixer, #btn-dark-mode { display: none; }
  
  .btn-sm { padding: .25rem .35rem; }
  .icon-btn { width: 28px; height: 28px; }
}