/* ============================================================
   WAVES — Layout Structure
   Layout: Sidebar + Main Content + Bottom Player
   ============================================================ */

/* ============================================================
   Main App Container
   ============================================================ */
   .waves-app {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 1fr var(--player-height);
    grid-template-areas:
      "sidebar main"
      "player player";
    height: 100vh;
    overflow: hidden;
  }
  
  /* ============================================================
     Sidebar
     ============================================================ */
  .waves-sidebar {
    width: 220px;
    grid-area: sidebar;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: var(--z-sidebar);
  }
  
  .sidebar-header {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
  }
  
  .sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: var(--weight-semibold);
    font-size: var(--text-xl);
    transition: color var(--transition-base);
  }
  
  .sidebar-logo:hover {
    color: var(--spx-violet);
  }
  
  .sidebar-logo img {
    width: 80px;
    height: 50px;
    color: var(--spx-violet);
  }
  
  .sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg) 0;
  }
  
  .nav-section {
    margin-bottom: var(--space-xl);
  }
  
  .nav-section-title {
    padding: 0 var(--space-xl);
    margin-bottom: var(--space-md);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  
  .nav-list {
    list-style: none;
  }
  
  .nav-item {
    display: block;
  }
  
  .nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-xl);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--text-sm);
    transition: all var(--transition-base);
    position: relative;
  }
  
  .nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--spx-violet);
    transform: scaleY(0);
    transition: transform var(--transition-base);
  }
  
  .nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
  }
  
  .nav-link.active {
    color: var(--spx-violet);
    background: var(--bg-hover);
  }
  
  .nav-link.active::before {
    transform: scaleY(1);
  }
  
  .nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
  }
  
  .sidebar-footer {
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-color);
    font-size: var(--text-xs);
    color: var(--text-muted);
  }
  
  /* ============================================================
     Main Content Area
     ============================================================ */
  .waves-main {
    grid-area: main;
    background: var(--bg-primary);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
  }
  
  .main-header {
    padding: var(--space-xl) var(--space-2xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(8px);
    background: rgba(11, 14, 20, 0.8);
  }
  
  .search-container {
    max-width: 600px;
  }
  
  .search-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-family: var(--font-sans);
    transition: all var(--transition-base);
  }
  
  .search-input::placeholder {
    color: var(--text-muted);
  }
  
  .search-input:focus {
    outline: none;
    border-color: var(--spx-violet);
    background: var(--bg-elevated);
  }
  
  .main-content {
    flex: 1;
    padding: var(--space-2xl);
    overflow-y: auto;
  }
  
  /* ============================================================
     Bottom Player
     ============================================================ */
  .waves-player {
    height: 90px;
    grid-area: player;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    align-items: center;
    padding: 0 var(--space-xl);
    gap: var(--space-xl);
    z-index: var(--z-player);
  }
  
  /* ============================================================
     Responsive Breakpoints
     ============================================================ */
  
  /* Tablet - Hide sidebar, show toggle */
  @media (max-width: 1024px) {
    .waves-app {
      grid-template-columns: 1fr;
      grid-template-areas:
        "main"
        "player";
    }
  
    .waves-sidebar {
      position: fixed;
      left: 0;
      top: 0;
      bottom: var(--player-height);
      transform: translateX(-100%);
      transition: transform var(--transition-slow);
      box-shadow: var(--shadow-xl);
    }
  
    .waves-sidebar.open {
      transform: translateX(0);
    }
  
    .main-header {
      padding: var(--space-lg) var(--space-xl);
    }
  
    .main-content {
      padding: var(--space-xl);
    }
  }
  
  /* Mobile - Compact everything */
  @media (max-width: 640px) {
    .waves-app {
      grid-template-rows: 1fr auto;
    }
  
    .waves-player {
      padding: 0 var(--space-lg);
      gap: var(--space-lg);
      grid-template-columns: 1fr;
      grid-template-rows: auto auto;
      height: auto;
      min-height: var(--player-height);
    }
  
    .main-header {
      padding: var(--space-md) var(--space-lg);
    }
  
    .main-content {
      padding: var(--space-lg);
    }
  
    .sidebar-header {
      padding: var(--space-lg);
    }
  
    .nav-link {
      padding: var(--space-md) var(--space-lg);
    }
  
    .sidebar-footer {
      padding: var(--space-md) var(--space-lg);
    }
  }
  
  /* ============================================================
     Menu Toggle Button (Mobile/Tablet)
     ============================================================ */
  .menu-toggle {
    display: none;
    position: fixed;
    top: var(--space-lg);
    left: var(--space-lg);
    z-index: calc(var(--z-sidebar) + 1);
    width: 40px;
    height: 40px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
  }
  
  .menu-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--spx-violet);
  }
  
  .menu-toggle svg {
    width: 20px;
    height: 20px;
  }
  
  @media (max-width: 1024px) {
    .menu-toggle {
      display: flex;
    }
  }
  
  /* ============================================================
     Overlay (for sidebar on mobile)
     ============================================================ */
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: calc(var(--z-sidebar) - 1);
    opacity: 0;
    transition: opacity var(--transition-slow);
  }
  
  .sidebar-overlay.active {
    opacity: 1;
  }
  
  @media (max-width: 1024px) {
    .sidebar-overlay.active {
      display: block;
    }
  }