body {
    transition: background-color 0.4s ease, color 0.4s ease;
}

.light-mode {
    --bg-main: #f0f4ff;
    --bg: #f0f4ff;
    --bg2: #ffffff;
    --glass: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.08);
    --text-main: #0f172a;
    --text: #1e293b;
    --text-muted: #64748b;
    background: #f0f4ff !important;
    color: #1e293b !important;
}
.light-mode .sidebar {
    background: #ffffff;
    border-right: 1px solid var(--glass-border);
}
.light-mode .sidebar-logo span {
    background: var(--primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.light-mode .nav-item { color: var(--text-muted); }
.light-mode .nav-item:hover { background: rgba(108, 99, 255, 0.1); color: var(--primary); }
.light-mode .nav-item.active { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; }
.light-mode .icon-btn { background: #ffffff; border: 1px solid var(--glass-border); color: var(--text); }
.light-mode .card, .light-mode .stat-card, .light-mode .test-card, .light-mode .quick-btn, .light-mode .panel, .light-mode .reminder-dropdown {
    background: #ffffff !important; border: 1px solid var(--glass-border) !important; box-shadow: 0 4px 15px rgba(0,0,0,0.03) !important; color: var(--text) !important;
}
.light-mode .table, .light-mode table th, .light-mode .table td { color: var(--text-main); }
.light-mode select, .light-mode input { background: #ffffff !important; color: var(--text) !important; border: 1px solid var(--glass-border) !important; }
.light-mode .search-bar input { background: transparent !important; border: none !important; outline: none !important; }
.light-mode select option { background: #ffffff; color: var(--text); }
.light-mode .perf-subject, .light-mode .stat-info .value { color: var(--text-main); }
.light-mode .reminder-item {
    background: rgba(0,0,0,0.02);
    border: 1px solid var(--glass-border);
}
.light-mode .reminder-item:hover {
    background: rgba(0,0,0,0.05);
}

/* Global Mass Loader */
.spinner-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-main, #000000);
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 24px;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.light-mode .spinner-overlay {
    background: #f0f4ff !important;
}

.loader-mass {
    position: relative;
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: var(--primary);
    border-bottom-color: var(--secondary);
    animation: spin-mass 1.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
    box-shadow: 0 0 20px rgba(108, 99, 255, 0.2);
}

.loader-ring::before {
    content: '';
    position: absolute;
    inset: 8px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-left-color: var(--accent);
    border-right-color: var(--success);
    animation: spin-mass 2s linear infinite reverse;
}

.loader-logo {
    width: 45px;
    height: auto;
    animation: pulseLogo 2s ease-in-out infinite;
    z-index: 2;
}

.loader-text {
    color: var(--text-main, #e2e8f0);
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: pulseText 2s ease-in-out infinite;
}

.light-mode .loader-text {
    color: #1e293b;
    -webkit-text-fill-color: #1e293b;
}

@keyframes spin-mass {
    to { transform: rotate(360deg); }
}
@keyframes pulseLogo {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 10px rgba(108,99,255,0.4)); }
    50% { transform: scale(1.15); filter: drop-shadow(0 0 25px rgba(108,99,255,0.8)); }
}
@keyframes pulseText {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; transform: scale(1.05); }
}

/* Global Light Mode Modals */
.light-mode .modal,
.light-mode .modal-card {
    background: #ffffff !important;
    border: 1px solid var(--glass-border) !important;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1) !important;
}

/* =========================================
   GLOBAL MOBILE UX & SMOOTHNESS UPGRADES
   ========================================= */

/* 1. Hardware Accelerated Smooth Animations */
.sidebar, .modal, .modal-card, .btn, .nav-item, .card, .stat-card, .test-card {
    will-change: transform, opacity;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1) !important;
}

/* 2. Standardized Sidebar Overlay */
.overlay {
    position: fixed !important;
    inset: 0 !important;
    background: rgba(0, 0, 0, 0.5) !important;
    backdrop-filter: blur(4px) !important;
    z-index: 998 !important; /* Just below sidebar which is usually 1000 */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    display: block !important;
    pointer-events: none !important;
}
.overlay.active {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
}

/* 3. Table Responsiveness */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1rem;
    border-radius: 12px;
}
.table-responsive table {
    width: 100%;
    min-width: 600px; /* Forces scrolling on small screens instead of squishing */
}

/* 4. Global Mobile Media Queries (Overrides) */
@media (max-width: 768px) {
    /* Touch Targets */
    .icon-btn, .menu-toggle, .close-modal {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Modals should fit screen with margin */
    .modal, .modal-card {
        width: calc(100% - 32px) !important;
        max-width: calc(100% - 32px) !important;
        margin: 16px !important;
        max-height: calc(100vh - 32px) !important;
    }
    
    /* Ensure Sidebars properly hide */
    .sidebar {
        transform: translateX(-100%);
        position: fixed !important;
        z-index: 999 !important;
        height: 100vh !important;
        box-shadow: 10px 0 30px rgba(0,0,0,0.5) !important;
    }
    .sidebar.open {
        transform: translateX(0) !important;
    }
    
    /* Content wrapper fixes */
    .main {
        margin-left: 0 !important;
        width: 100% !important;
        padding: 16px !important;
    }
    
    /* Grid fixes */
    .content-grid, .stats-grid, .quick-actions, .courses-grid, .course-grid, .test-grid {
        grid-template-columns: 1fr !important;
        gap: 16px !important;
    }
}

/* Fix Mobile Header in Light Mode */
.light-mode .mobile-header {
    background: rgba(255, 255, 255, 0.7) !important;
    backdrop-filter: blur(16px) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    border: 1px solid rgba(255, 255, 255, 0.8) !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08) !important;
}

/* Fix Side Panels (Notifications & Chatbot) in Light Mode */
.light-mode .notif-panel,
.light-mode .chatbot-window {
    background: #ffffff !important;
    border-left: 1px solid var(--glass-border) !important;
}

.light-mode .notif-header .close-btn,
.light-mode .notif-header h3 {
    color: #1e293b !important;
}

.light-mode .msg.bot {
    background: #f1f5f9 !important;
    color: #1e293b !important;
}

.light-mode .chatbot-header * {
    color: #ffffff !important;
}

/* 5. Mobile Bottom Navigation */
.mobile-bottom-nav {
    display: none; /* Hidden on desktop */
}

@media (max-width: 768px) {
    /* Show bottom nav on mobile */
    .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 15px;
        left: 15px;
        right: 15px;
        height: 65px;
        background: rgba(15, 15, 35, 0.65);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        z-index: 1000;
        justify-content: space-around;
        align-items: center;
        padding: 0 10px;
        border-radius: 35px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    }
    
    /* Ensure body has padding so content doesn't hide behind nav */
    body {
        padding-bottom: 90px !important;
    }

    .mobile-bottom-nav .nav-item {
        display: flex;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        color: rgba(255, 255, 255, 0.7); /* Faded white for inactive */
        padding: 8px 14px;
        border-radius: 25px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        gap: 6px;
    }

    .mobile-bottom-nav .nav-item i {
        font-size: 18px;
    }

    .mobile-bottom-nav .nav-item .nav-text {
        font-size: 13px;
        font-weight: 600;
        max-width: 0;
        overflow: hidden;
        opacity: 0;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* Active State Pill */
    .mobile-bottom-nav .nav-item.active {
        background: rgba(255, 255, 255, 0.15);
        color: #ffffff; 
    }

    .mobile-bottom-nav .nav-item.active .nav-text {
        max-width: 100px;
        opacity: 1;
    }

    /* Light Mode Adjustments */
    .light-mode .mobile-bottom-nav {
        background: rgba(255, 255, 255, 0.65);
        border-top: 1px solid rgba(0, 0, 0, 0.05);
    }
    .light-mode .mobile-bottom-nav .nav-item {
        color: rgba(0, 0, 0, 0.5);
    }
    .light-mode .mobile-bottom-nav .nav-item.active {
        background: var(--primary); /* Use the primary purple/blue color */
        color: #ffffff;
    }
    
    /* Move Chatbot above bottom nav on mobile */
    .chatbot-fab {
        bottom: 100px !important;
    }
    .chatbot-window {
        bottom: 170px !important;
    }
}

/* 6. Staggered Sidebar Waterfall Animation */
@keyframes slideInRightStaggered {
    0% { opacity: 0; transform: translateX(-25px); }
    100% { opacity: 1; transform: translateX(0); }
}

/* By default, prepare elements for animation */
.sidebar .nav-label,
.sidebar .nav-item,
.sidebar .sidebar-user {
    opacity: 0;
    animation: slideInRightStaggered 0.4s cubic-bezier(0.2, 0.8, 0.2, 1.1) forwards;
}

@media (max-width: 768px) {
    /* On mobile, reset animation when sidebar is closed */
    .sidebar:not(.open) .nav-label,
    .sidebar:not(.open) .nav-item,
    .sidebar:not(.open) .sidebar-user {
        animation: none;
        opacity: 0;
    }
    /* Trigger animation only when opened */
    .sidebar.open .nav-label,
    .sidebar.open .nav-item,
    .sidebar.open .sidebar-user {
        animation: slideInRightStaggered 0.4s cubic-bezier(0.2, 0.8, 0.2, 1.1) forwards;
    }
}

/* 7. Staggered Card Animation */
@keyframes slideDownFadeCard {
    0% { opacity: 0; transform: translateY(-30px); }
    100% { opacity: 1; transform: translateY(0); }
}

.stat-card, .course-card, .test-card, .chart-card, .history-card, .review-card, .dsh-card, .result-hero, .stats-row {
    opacity: 0;
    animation: slideDownFadeCard 0.5s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

/* Disable loader on subsequent navigations */
html.no-loader #loader {
    display: none !important;
}
body:has(.sidebar.open) .mobile-bottom-nav { display: none !important; }