/* ══ Illuminate AI — Unified Layout System v2 ══
   Modern web standards: Container queries, View Transitions, Popover API,
   Anchor Positioning, Scroll-driven animations, CSS Grid/Subgrid
   ════════════════════════════════════════════════════════════════════ */

@layer layout;

/* ══ BASE LAYOUT ══ */
@layer layout {
  /* App shell — full viewport */
  .app-shell {
    min-height: 100vh;
    min-height: 100dvh;
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    color: var(--text-primary);
    /* View transition for page changes */
    view-transition-name: var(--vt-page);
  }
  
  /* Skip link for accessibility */
  .skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
    z-index: var(--z-max);
  }
  
  .skip-link:focus {
    position: fixed;
    left: var(--space-4);
    top: var(--space-4);
    width: auto;
    height: auto;
    overflow: visible;
    padding: var(--space-3) var(--space-5);
    background: var(--accent);
    color: var(--text-on-accent);
    border-radius: var(--radius-lg);
    font-weight: var(--fw-medium);
    z-index: var(--z-max);
    animation: none;
  }
  
  /* ─────────────────────────────────────────────────────────────
     APP HEADER — Sticky with backdrop blur
     ───────────────────────────────────────────────────────────── */
  .app-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
    padding: 0 var(--space-6);
    background: color-mix(in oklch, var(--bg) 85%, transparent);
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    transition: background var(--transition-normal), border-color var(--transition-normal);
  }
  
  .app-header:has(+ .app-main .app-content:has(:target)) {
    box-shadow: var(--shadow-md);
  }
  
  .header-brand {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--fw-semibold);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
  
  .header-brand em {
    font-style: italic;
    color: var(--accent);
    font-weight: var(--fw-regular);
  }
  
  .header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
  }
  
  /* ─────────────────────────────────────────────────────────────
     MAIN CONTENT AREA
     ───────────────────────────────────────────────────────────── */
  .app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg);
    transition: margin-left var(--transition-normal);
    position: relative;
    z-index: var(--z-base);
    /* Container for container queries */
    container-type: inline-size;
    container-name: app-main;
  }
  
  .app-sidebar.sidebar--collapsed ~ .app-main {
    margin-left: var(--sidebar-collapsed);
  }
  
  /* Page content wrapper — constrained width for readability */
  .app-content {
    padding: var(--space-fluid-md) var(--space-fluid-lg);
    max-width: var(--container-max);
    margin: 0 auto;
    width: 100%;
    /* View transition for content changes */
    view-transition-name: var(--vt-content);
  }
  
  /* ─────────────────────────────────────────────────────────────
     PAGE HEADER — Editorial, not UI chrome
     ───────────────────────────────────────────────────────────── */
  .page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
  }
  
  .page-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 1.75rem + 1.5vw, 3rem);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin: 0 0 var(--space-3);
    /* Text balance for better wrapping */
    text-wrap: balance;
  }
  
  .page-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 50ch;
    margin: 0;
    font-weight: var(--fw-regular);
  }
  
  .page-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    align-items: center;
    margin-top: var(--space-4);
  }
  
  /* ─────────────────────────────────────────────────────────────
     SECTION HEADER — Editorial section titles
     ───────────────────────────────────────────────────────────── */
  .section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
  }
  
  .section-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 500;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin: 0;
  }
  
  .section-subtitle {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 55ch;
    margin: var(--space-2) 0 0;
  }
  
  .section-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    align-items: center;
  }
  
  /* ─────────────────────────────────────────────────────────────
     EDITORIAL DIVIDER
     ───────────────────────────────────────────────────────────── */
  .section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin: var(--space-16) 0;
  }
  
  /* ─────────────────────────────────────────────────────────────
     PAGE FOOTER
     ───────────────────────────────────────────────────────────── */
  .page-footer {
    margin-top: var(--space-24);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
    font-size: var(--text-sm);
  }
}

/* ══ DESKTOP SIDEBAR ══ */
@layer layout {
  .app-sidebar {
    width: var(--nav-width);
    height: 100vh;
    height: 100dvh;
    position: fixed;
    left: 0;
    top: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    z-index: var(--z-sidebar);
    transition: width var(--transition-normal), transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* View transition for sidebar changes */
    view-transition-name: var(--vt-sidebar);
  }
  
  .app-sidebar.sidebar--collapsed {
    width: var(--nav-collapsed);
  }
  
  .app-sidebar.sidebar--hidden {
    display: none;
  }
  
  .app-sidebar.sidebar--mobile-open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-drawer);
  }
  
  /* ─────────────────────────────────────────────────────────────
     SIDEBAR HEADER — Logo + collapse toggle
     ───────────────────────────────────────────────────────────── */
  .sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }
  
  .sidebar-logo {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: opacity var(--transition-fast);
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-logo {
    opacity: 0;
    pointer-events: none;
  }
  
  .sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-normal);
  }
  
  .sidebar-toggle:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
  }
  
  .sidebar-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  
  .sidebar-toggle .material-symbols-outlined {
    font-size: 22px;
    line-height: 1;
    transition: transform var(--transition-normal);
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-toggle .material-symbols-outlined {
    transform: rotate(180deg);
  }
  
  /* ─────────────────────────────────────────────────────────────
     SIDEBAR NAVIGATION
     ───────────────────────────────────────────────────────────── */
  .sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
  }
  
  .sidebar-nav::-webkit-scrollbar {
    width: 6px;
  }
  
  .sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
  }
  
  .sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--radius-full);
  }
  
  .sidebar-section {
    margin-bottom: var(--space-6);
  }
  
  .sidebar-section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 0 var(--space-4);
    margin-bottom: var(--space-2);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-section-title {
    display: none;
  }
  
  .sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    color: var(--text-dim);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all var(--duration-fast) var(--ease-out);
    margin-bottom: var(--space-1);
    border: 1px solid transparent;
  }
  
  .sidebar-link:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    transform: translateX(4px);
    border-color: var(--border);
  }
  
  .sidebar-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
  }
  
  .sidebar-link--active {
    background: var(--accent-light);
    color: var(--accent);
    border-color: var(--accent);
    box-shadow: var(--shadow-sm), 0 0 20px var(--accent-glow);
  }
  
  .sidebar-link-icon {
    font-size: var(--text-lg);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    line-height: 1;
  }
  
  .sidebar-link-text {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-link-text {
    display: none;
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-link {
    justify-content: center;
    padding: var(--space-3);
    margin: var(--space-1) var(--space-2);
    width: auto;
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-link:hover {
    transform: none;
  }
  
  /* ─────────────────────────────────────────────────────────────
     SIDEBAR FOOTER / USER PROFILE
     ───────────────────────────────────────────────────────────── */
  .sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border);
    background: color-mix(in oklch, var(--surface) 98%, transparent);
    flex-shrink: 0;
  }
  
  .sidebar-user-card-link {
    text-decoration: none;
    display: block;
  }
  
  .sidebar-user-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal) var(--ease-out);
    border: 1px solid transparent;
  }
  
  .sidebar-user-card:hover {
    background: var(--surface-hover);
    border-color: var(--border);
    transform: translateY(-2px);
  }
  
  .sidebar-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--text-on-accent);
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
  }
  
  .sidebar-user-info {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
  }
  
  .sidebar-user-name {
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  .sidebar-user-role {
    font-size: var(--text-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
  }
  
  .sidebar-user-chevron {
    margin-left: auto;
    font-size: 16px;
    color: var(--text-muted);
    transition: transform var(--transition-normal), color var(--transition-fast);
  }
  
  .sidebar-user-card:hover .sidebar-user-chevron {
    color: var(--text-primary);
    transform: translateX(3px);
  }
  
  .app-sidebar.sidebar--collapsed .sidebar-footer {
    display: none;
  }
}

/* ══ MOBILE DRAWER ══ */
@layer layout {
  .mobile-drawer {
    position: fixed;
    inset: 0;
    z-index: var(--z-drawer-backdrop);
    display: none;
    hidden: true;
  }
  
  .mobile-drawer.open {
    display: block;
    hidden: false;
  }
  
  .mobile-drawer-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity var(--transition-normal);
  }
  
  .mobile-drawer.open .mobile-drawer-backdrop {
    opacity: 1;
  }
  
  .mobile-drawer-content {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(var(--drawer-width), 85vw);
    background: var(--surface);
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-spring);
  }
  
  .mobile-drawer.open .mobile-drawer-content {
    transform: translateX(0);
  }
  
  .mobile-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }
  
  .mobile-drawer-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--text-primary);
    margin: 0;
  }
  
  .mobile-drawer-close {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    transition: background-color var(--duration-fast), color var(--duration-fast);
  }
  
  .mobile-drawer-close:hover {
    background: var(--surface-hover);
    color: var(--text-main);
  }
  
  .mobile-drawer-close:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
  
  .mobile-drawer-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4) var(--space-6);
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
  }
  
  .mobile-drawer-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--text-sm);
    margin-bottom: var(--space-1);
    transition: all var(--duration-fast);
    border: 1px solid transparent;
  }
  
  .mobile-drawer-item:hover,
  .mobile-drawer-item.active {
    background: var(--accent-light);
    color: var(--accent);
    border-color: var(--accent);
  }
  
  .mobile-drawer-item .material-symbols-outlined {
    font-size: var(--text-lg);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    line-height: 1;
  }
  
  .mobile-drawer-divider {
    height: 1px;
    background: var(--border);
    margin: var(--space-3) 0;
  }
  
  .mobile-drawer-section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: var(--space-2) var(--space-4);
    margin-bottom: var(--space-1);
  }
}

/* ══ MOBILE BOTTOM NAVIGATION ══ */
@layer layout {
  .bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--surface);
    border-top: 1px solid var(--border);
    display: none;
    justify-content: space-around;
    align-items: center;
    z-index: var(--z-sticky);
    padding-bottom: env(safe-area-inset-bottom);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
    transform: translateY(100%);
    transition: transform var(--transition-normal);
    hidden: true;
  }
  
  .bottom-nav.visible {
    display: flex;
    hidden: false;
    transform: translateY(0);
  }
  
  .bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 10px;
    font-weight: 500;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast);
    min-width: 0;
    flex: 1;
    max-width: 100%;
  }
  
  .bottom-nav-item .material-symbols-outlined {
    font-size: 24px;
    line-height: 1;
    font-variation-settings: 'FILL' 0;
  }
  
  .bottom-nav-item.active {
    color: var(--accent);
  }
  
  .bottom-nav-item.active .material-symbols-outlined {
    font-variation-settings: 'FILL' 1;
  }
  
  .bottom-nav-item:not(.active):active {
    background: var(--surface-hover);
  }
  
  .bottom-nav-item:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
}

/* ══ MOBILE HEADER TOGGLE ══ */
@layer layout {
  .mobile-sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
  }
  
  .mobile-sidebar-toggle:hover {
    background: var(--surface-hover);
    color: var(--text-main);
  }
  
  .mobile-sidebar-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
}

/* ══ RESPONSIVE VISIBILITY ══ */
@layer layout {
  /* Mobile (< 640px) */
  @media (max-width: 639px) {
    .app-main {
      margin-left: 0;
      padding-bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom) + var(--space-4));
    }
    
    .app-sidebar {
      transform: translateX(-100%);
    }
    
    .app-sidebar.sidebar--mobile-open {
      transform: translateX(0);
      box-shadow: var(--shadow-xl);
    }
    
    .bottom-nav {
      display: flex;
      hidden: false;
    }
    
    .mobile-drawer {
      display: block;
      hidden: false;
    }
    
    .mobile-sidebar-toggle {
      display: flex;
    }
    
    .sidebar-toggle {
      display: none;
    }
    
    .header-user-name {
      display: none;
    }
    
    .app-header {
      padding: 0 var(--space-4);
    }
  }
  
  /* Tablet (640px - 1023px) */
  @media (min-width: 640px) and (max-width: 1023px) {
    .app-main {
      margin-left: var(--sidebar-collapsed);
    }
    
    .app-sidebar {
      width: var(--sidebar-collapsed);
    }
    
    .app-sidebar.sidebar--mobile-open {
      width: var(--sidebar-width);
      box-shadow: var(--shadow-xl);
      z-index: var(--z-drawer);
    }
    
    .app-sidebar.sidebar--collapsed {
      width: var(--sidebar-collapsed);
    }
    
    .bottom-nav {
      display: none;
      hidden: true;
    }
    
    .mobile-drawer {
      display: none;
      hidden: true;
    }
    
    .mobile-sidebar-toggle {
      display: flex;
    }
    
    .sidebar-toggle {
      display: none;
    }
  }
  
  /* Desktop (≥ 1024px) */
  @media (min-width: 1024px) {
    .app-main {
      margin-left: var(--sidebar-width);
    }
    
    .app-sidebar {
      width: var(--sidebar-width);
      transform: none;
    }
    
    .app-sidebar.sidebar--collapsed {
      width: var(--sidebar-collapsed);
    }
    
    .app-sidebar.sidebar--collapsed ~ .app-main {
      margin-left: var(--sidebar-collapsed);
    }
    
    .bottom-nav {
      display: none;
      hidden: true;
    }
    
    .mobile-drawer {
      display: none;
      hidden: true;
    }
    
    .mobile-sidebar-toggle {
      display: none;
    }
    
    .sidebar-toggle {
      display: flex;
    }
  }
  
  /* Large desktop */
  @media (min-width: 1440px) {
    .app-content {
      padding: var(--space-fluid-lg) var(--space-fluid-xl);
    }
  }
  
  /* Ultra-wide */
  @media (min-width: 1920px) {
    .app-content {
      max-width: var(--container-wide);
    }
  }
}

/* ══ CONTAINER QUERIES FOR COMPONENT ADAPTABILITY ══ */
@layer layout {
  /* Card container queries */
  .card-container {
    container-type: inline-size;
    container-name: card;
  }
  
  @container card (max-width: 320px) {
    .card__header { flex-direction: column; align-items: flex-start; }
    .card__actions { width: 100%; justify-content: flex-start; }
  }
  
  @container card (min-width: 480px) {
    .card__header { flex-direction: row; }
  }
  
  /* Stats grid container queries */
  .stats-grid {
    container-type: inline-size;
    container-name: stats;
  }
  
  @container stats (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr 1fr; }
  }
  
  @container stats (min-width: 640px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
  }
  
  @container stats (min-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
  }
  
  /* Schedule grid */
  .schedule-grid {
    container-type: inline-size;
    container-name: schedule;
  }
  
  @container schedule (max-width: 560px) {
    .schedule-grid { grid-template-columns: 1fr; }
  }
  
  @container schedule (min-width: 800px) {
    .schedule-grid { grid-template-columns: repeat(2, 1fr); }
  }
  
  @container schedule (min-width: 1200px) {
    .schedule-grid { grid-template-columns: repeat(5, 1fr); }
  }
  
  /* Bento grid */
  .bento-grid {
    container-type: inline-size;
    container-name: bento;
  }
  
  @container bento (max-width: 560px) {
    .bento-grid { grid-template-columns: 1fr; }
  }
  
  @container bento (min-width: 720px) {
    .bento-grid { grid-template-columns: repeat(2, 1fr); }
  }
  
  @container bento (min-width: 1100px) {
    .bento-grid { grid-template-columns: repeat(3, 1fr); }
  }
}

/* ══ SCROLL-DRIVEN ANIMATIONS ══ */
@layer layout {
  /* Scroll progress indicator */
  .scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transform-origin: 0 50%;
    transform: scaleX(0);
    transform-origin: 0 50%;
    pointer-events: none;
    z-index: var(--z-tooltip);
  }
  
  /* Scroll-aware header */
  .app-header.scrolled {
    box-shadow: var(--shadow-md);
    border-bottom-color: var(--border-strong);
  }
  
  /* Reveal animations on scroll */
  .scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  }
  
  .scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  /* Staggered reveal */
  .scroll-reveal:nth-child(1) { transition-delay: 0ms; }
  .scroll-reveal:nth-child(2) { transition-delay: 80ms; }
  .scroll-reveal:nth-child(3) { transition-delay: 160ms; }
  .scroll-reveal:nth-child(4) { transition-delay: 240ms; }
  .scroll-reveal:nth-child(5) { transition-delay: 320ms; }
  .scroll-reveal:nth-child(6) { transition-delay: 400ms; }
  
  @media (prefers-reduced-motion: reduce) {
    .scroll-reveal {
      opacity: 1;
      transform: none;
      transition: none;
    }
  }
}

/* ══ VIEW TRANSITIONS ══ */
@layer layout {
  @supports (view-transition-name: none) {
    .app-shell {
      view-transition-name: root;
    }
    
    .page {
      view-transition-name: page;
    }
    
    .card {
      view-transition-name: card;
    }
    
    .sidebar {
      view-transition-name: sidebar;
    }
    
    .header {
      view-transition-name: header;
    }
    
    .nav {
      view-transition-name: nav;
    }
    
    ::view-transition-old(root),
    ::view-transition-new(root) {
      animation-duration: var(--duration-slow);
      animation-timing-function: var(--ease-out);
    }
    
    ::view-transition-old(page),
    ::view-transition-new(page) {
      animation-duration: var(--duration-slower);
      animation-timing-function: var(--ease-out);
    }
    
    @media (prefers-reduced-motion: reduce) {
      ::view-transition-group(*),
      ::view-transition-image-pair(*),
      ::view-transition-old(*),
      ::view-transition-new(*) {
        animation-duration: 0.01ms !important;
      }
    }
  }
}

/* ══ POPUP API FOR TOOLTIPS ══ */
@layer layout {
  @supports (anchor-name: none) {
    [popover] {
      position: absolute;
      margin: 0;
      padding: var(--space-3) var(--space-4);
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      z-index: var(--z-popover);
      max-width: 280px;
      animation: popoverEnter var(--duration-normal) var(--ease-out);
    }
    
    [popover]:popover-open {
      animation: popoverEnter var(--duration-normal) var(--ease-out);
    }
    
    [popover]:popover-open::backdrop {
      background: rgba(0,0,0,0.3);
      backdrop-filter: blur(4px);
      animation: backdropFade var(--duration-fast) var(--ease-out);
    }
    
    @keyframes popoverEnter {
      from { opacity: 0; transform: scale(0.95) translateY(4px); }
      to { opacity: 1; transform: scale(1) translateY(0); }
    }
    
    @keyframes backdropFade {
      from { opacity: 0; }
      to { opacity: 1; }
    }
  }
}

/* ══ ANCHOR POSITIONING ══ */
@layer layout {
  @supports (anchor-name: none) {
    [popover][anchor] {
      position: absolute;
      position-anchor: attr(anchor);
      position-try-options: flip-block, flip-inline;
      inset: auto anchor(--anchor-bottom) auto auto;
      margin-top: var(--space-2);
    }
  }
}

/* ══ PRINT STYLES ══ */
@layer layout {
  @media print {
    .app-sidebar,
    .bottom-nav,
    .mobile-drawer,
    .app-header,
    .sidebar-toggle,
    .mobile-sidebar-toggle,
    .page-actions,
    .btn,
    .chart-card,
    .chart-container,
    .quick-actions,
    .sidebar-toggle,
    .mobile-sidebar-toggle,
    .mobile-toggle,
    .mobile-drawer,
    .bottom-nav,
    .skip-link {
      display: none !important;
    }
    
    .app-main {
      margin-left: 0;
    }
    
    .app-content {
      padding: 0;
    }
    
    .card {
      box-shadow: none;
      border: 1px solid #ccc;
      break-inside: avoid;
    }
    
    .kpi-card {
      box-shadow: none;
      border: 1px solid #ccc;
    }
    
    .stat-card {
      box-shadow: none;
      border: 1px solid #ccc;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    a[href^="http"]::after {
      content: " (" attr(href) ")";
      font-size: 0.8em;
      color: #666;
    }
    
    .app-header,
    .app-sidebar,
    .bottom-nav,
    .mobile-drawer,
    .mobile-drawer-backdrop,
    .mobile-drawer-content,
    .sidebar-toggle,
    .mobile-sidebar-toggle {
      display: none !important;
    }
  }
}

/* ══ HIGH CONTRAST MODE ══ */
@layer layout {
  @media (prefers-contrast: more) {
    .app-sidebar,
    .bottom-nav,
    .mobile-drawer-content,
    .card,
    .kpi-card,
    .stat-card,
    .stat-card,
    .chart-card,
    .bento-card {
      border-color: currentColor;
    }
    
    .sidebar-link.active,
    .bottom-nav-item.active,
    .mobile-drawer-item.active {
      background: Canvas;
      color: CanvasText;
      border: 2px solid CanvasText;
    }
    
    .btn--primary,
    .btn--secondary,
    .btn--outline,
    .btn--danger {
      border: 2px solid currentColor;
    }
    
    .btn--primary {
      background: CanvasText;
      color: Canvas;
    }
  }
}

/* ══ FORCED COLORS MODE (Windows High Contrast) ══ */
@layer layout {
  @media (forced-colors: active) {
    .app-sidebar,
    .app-header,
    .bottom-nav,
    .mobile-drawer-content,
    .sidebar-link,
    .bottom-nav-item,
    .mobile-drawer-item,
    .card,
    .kpi-card,
    .stat-card,
    .chart-card,
    .bento-card,
    .stat-card,
    .btn,
    .field__input {
      forced-color-adjust: none;
      border-color: currentColor;
    }
    
    .sidebar-link:focus-visible,
    .bottom-nav-item:focus-visible,
    .mobile-drawer-item:focus-visible,
    .btn:focus-visible,
    .field__input:focus-visible {
      outline: 2px solid Highlight;
      outline-offset: 2px;
    }
    
    .btn--primary {
      background: CanvasText;
      color: Canvas;
    }
    
    .field__input:focus {
      outline: 2px solid Highlight;
      outline-offset: 2px;
    }
  }
}