/* /assets/css/teacher-dashboard.css - COMPLETE DASHBOARD (Mobile + Desktop Sidebar) */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* --- COLOR PALETTE --- */
    --mcq-primary: #2563eb;
    --mcq-primary-hover: #1d4ed8;
    --mcq-primary-light: #dbeafe;
    --mcq-secondary: #64748b;
    --mcq-success: #059669;
    --mcq-success-light: #d1fae5;
    --mcq-danger: #dc2626;
    --mcq-danger-light: #fee2e2;
    --mcq-warning: #d97706;
    --mcq-warning-light: #fef3c7;
    --mcq-bg: #f8fafc;
    --mcq-surface: #ffffff;
    --mcq-text-main: #111827;
    --mcq-text-muted: #6b7280;
    --mcq-border: #e2e8f0;
    --mcq-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --mcq-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    --mcq-radius: 16px;
    --mcq-radius-sm: 12px;
    
    /* --- LAYOUT VARIABLES --- */
    --sidebar-width: 260px;
    --header-height: 70px;
}

/* =========================================
   1. RESET & BASE STYLES
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--mcq-bg);
    color: var(--mcq-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.mcq-td-wrapper {
    max-width: 100%;
    min-height: 100vh;
}

/* =========================================
   2. HEADER
   ========================================= */
.mcq-td-header {
    background: var(--mcq-surface);
    height: var(--header-height);
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--mcq-border);
    position: sticky;
    top: 0;
    z-index: 500; /* High z-index to stay on top */
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mcq-td-header h1 {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
}

.mcq-td-header p {
    font-size: 0.85rem;
    color: var(--mcq-text-muted);
    margin: 0;
    font-weight: 500;
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* =========================================
   3. LAYOUT STRUCTURE (Grid System)
   ========================================= */
.mcq-dashboard-layout {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - var(--header-height));
}

.mcq-main-content {
    padding: 20px;
    flex: 1;
    animation: fadeIn 0.3s ease;
    padding-bottom: 80px; /* Space for mobile nav */
}

/* Desktop Sidebar (Hidden by default, shown in Media Query) */
.mcq-desktop-sidebar {
    display: none;
    background: var(--mcq-surface);
    border-right: 1px solid var(--mcq-border);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    position: sticky;
    top: var(--header-height);
    padding: 20px;
    overflow-y: auto;
}

/* Sidebar Navigation Items */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--mcq-text-muted);
    text-decoration: none;
    border-radius: var(--mcq-radius-sm);
    font-weight: 500;
    transition: all 0.2s ease;
}

.sidebar-item:hover {
    background: var(--mcq-bg);
    color: var(--mcq-primary);
}

.sidebar-item.active {
    background: var(--mcq-primary-light);
    color: var(--mcq-primary);
}

.sidebar-icon {
    font-size: 20px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-divider {
    height: 1px;
    background: var(--mcq-border);
    margin: 8px 0;
}

.sidebar-badge {
    background: var(--mcq-danger);
    color: white;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: auto;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================
   4. MESSAGING CREDITS
   ========================================= */
.credits-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--mcq-radius);
    padding: 24px;
    margin-bottom: 24px;
    color: white;
    box-shadow: var(--mcq-shadow-lg);
    position: relative;
    overflow: hidden;
}

.credits-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.credits-card h3 {
    margin: 0 0 20px 0;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.credits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    position: relative;
    z-index: 1;
}

.credit-item {
    text-align: center;
    padding: 16px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--mcq-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.2s;
}

.credit-item:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.2);
}

.credit-icon {
    font-size: 24px;
    margin-bottom: 8px;
    display: block;
    height: 24px;
    width: 24px;
    margin-left: auto;
    margin-right: auto;
}

.credit-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
    display: block;
}

.credit-label {
    font-size: 0.8rem;
    opacity: 0.9;
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* =========================================
   5. COURSES & LISTS
   ========================================= */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--mcq-text-main);
    margin: 0;
}

/* Grid for cards (Desktop enhancement) */
.courses-grid, .requests-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.course-card {
    background: var(--mcq-surface);
    border-radius: var(--mcq-radius);
    padding: 24px;
    box-shadow: var(--mcq-shadow);
    border: 1px solid var(--mcq-border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    height: 100%; /* For grid consistency */
    display: flex;
    flex-direction: column;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--mcq-primary);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--mcq-shadow-lg);
    border-color: var(--mcq-primary-light);
}

.course-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--mcq-text-main);
    margin: 0 0 12px 0;
    line-height: 1.4;
}

.course-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    color: var(--mcq-text-muted);
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.course-status {
    display: inline-block;
    padding: 4px 12px;
    background: var(--mcq-success-light);
    color: var(--mcq-success);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.course-actions {
    margin-top: auto; /* Pushes actions to bottom */
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

/* =========================================
   6. REQUESTS & QUIZZES
   ========================================= */
.requests-card {
    background: var(--mcq-surface);
    border-radius: var(--mcq-radius);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--mcq-shadow);
    border: 1px solid var(--mcq-border);
}

.requests-card h3 {
    margin: 0 0 20px 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--mcq-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.request-badge {
    background: var(--mcq-danger);
    color: white;
    font-size: 0.8rem;
    padding: 4px 10px;
    border-radius: 12px;
    margin-left: 8px;
}

.request-item {
    background: var(--mcq-bg);
    border-radius: var(--mcq-radius-sm);
    padding: 16px;
    border: 1px solid var(--mcq-border);
    transition: all 0.2s;
}

.request-item:hover {
    border-color: var(--mcq-primary);
    background: var(--mcq-primary-light);
}

.request-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.request-student {
    font-weight: 600;
    color: var(--mcq-text-main);
    font-size: 1rem;
}

.request-time {
    font-size: 0.75rem;
    color: var(--mcq-text-muted);
    background: var(--mcq-surface);
    padding: 4px 8px;
    border-radius: 8px;
    white-space: nowrap;
}

.request-course {
    color: var(--mcq-primary);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 16px;
    display: block;
}

.request-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.quiz-card {
    background: var(--mcq-surface);
    border-radius: var(--mcq-radius);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: var(--mcq-shadow);
    border: 1px solid var(--mcq-border);
    transition: all 0.3s ease;
}

.quiz-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--mcq-shadow-lg);
    border-color: var(--mcq-primary);
}

.quiz-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--mcq-text-main);
    margin: 0 0 16px 0;
}

.quiz-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--mcq-text-muted);
}

.quiz-actions {
    display: flex;
    gap: 10px;
}

/* =========================================
   7. BUTTONS
   ========================================= */
.mcq-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
    font-family: inherit;
}

.mcq-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.mcq-btn:active {
    transform: translateY(0);
}

.mcq-btn-primary {
    background: var(--mcq-primary);
    color: white;
}

.mcq-btn-primary:hover {
    background: var(--mcq-primary-hover);
}

.mcq-btn-success {
    background: var(--mcq-success);
    color: white;
}

.mcq-btn-success:hover {
    background: #047857;
}

.mcq-btn-danger {
    background: var(--mcq-danger);
    color: white;
}

.mcq-btn-danger:hover {
    background: #b91c1c;
}

.mcq-btn-outline {
    background: transparent;
    border: 1px solid var(--mcq-border);
    color: var(--mcq-text-main);
}

.mcq-btn-outline:hover {
    border-color: var(--mcq-primary);
    background: var(--mcq-primary-light);
    color: var(--mcq-primary);
}

.mcq-btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.mcq-btn-full {
    width: 100%;
}

.desktop-only-btn {
    display: none;
}

/* =========================================
   8. MOBILE NAVIGATION & FAB
   ========================================= */
.mcq-mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--mcq-surface);
    border-top: 1px solid var(--mcq-border);
    display: flex;
    justify-content: space-around;
    padding: 12px 10px;
    z-index: 100;
    box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.05);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--mcq-text-muted);
    font-size: 0.7rem;
    padding: 8px 12px;
    border-radius: var(--mcq-radius-sm);
    transition: all 0.2s;
    position: relative;
    min-width: 60px;
}

.nav-item.active {
    color: var(--mcq-primary);
    background: var(--mcq-primary-light);
}

.nav-icon {
    font-size: 20px;
    margin-bottom: 4px;
    height: 20px;
    width: 20px;
}

.nav-badge {
    position: absolute;
    top: -2px;
    right: 0;
    background: var(--mcq-danger);
    color: white;
    font-size: 0.6rem;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.fab {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--mcq-primary);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    z-index: 99;
    transition: all 0.3s ease;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
}

/* =========================================
   9. NOTIFICATIONS & MODALS
   ========================================= */
.notification-bell {
    position: relative;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.2s;
}

.notification-bell:hover {
    background: var(--mcq-bg);
}

.notification-dropdown {
    display: none;
    position: absolute;
    top: 55px; /* Fixed: Positioned nicely below header */
    right: 10px;
    width: 320px;
    max-width: 90vw;
    background: var(--mcq-surface);
    border-radius: var(--mcq-radius);
    box-shadow: var(--mcq-shadow-lg);
    border: 1px solid var(--mcq-border);
    z-index: 1000; /* Fixed: Higher than content */
    animation: slideUp 0.2s ease;
}

.notification-header {
    padding: 16px;
    border-bottom: 1px solid var(--mcq-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notification-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--mcq-text-main);
    margin: 0;
}

.notification-clear {
    background: none;
    border: none;
    color: var(--mcq-primary);
    font-size: 0.85rem;
    cursor: pointer;
}

.notification-list {
    max-height: 400px;
    overflow-y: auto;
}

.notification-item {
    padding: 16px;
    border-bottom: 1px solid var(--mcq-border);
    transition: background 0.2s;
    cursor: pointer;
}

.notification-item:hover {
    background: var(--mcq-bg);
}

.notification-item.unread {
    background: var(--mcq-primary-light);
}

/* Modal Styles */
.mcq-modal-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.mcq-modal-content {
    background: var(--mcq-surface);
    width: 100%;
    max-width: 450px;
    border-radius: var(--mcq-radius);
    padding: 24px;
    position: relative;
    box-shadow: var(--mcq-shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.mcq-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 24px;
    line-height: 1;
    color: var(--mcq-text-muted);
    cursor: pointer;
    background: var(--mcq-bg);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.mcq-modal-title {
    margin: 0 0 20px 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--mcq-text-main);
}

.mcq-form-group { margin-bottom: 20px; }

.mcq-form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--mcq-text-main);
    font-size: 0.9rem;
}

.mcq-form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--mcq-border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--mcq-text-main);
    background: var(--mcq-surface);
    transition: all 0.2s;
    font-family: inherit;
}

.mcq-form-input:focus {
    outline: none;
    border-color: var(--mcq-primary);
    box-shadow: 0 0 0 3px var(--mcq-primary-light);
}

.mcq-modal-actions { display: flex; gap: 12px; }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--mcq-text-muted);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    color: #cbd5e1;
    display: block;
    height: 48px;
    width: 48px;
    margin-left: auto;
    margin-right: auto;
}

/* =========================================
   10. DESKTOP OPTIMIZATION (THE BIG FIXES)
   ========================================= */
@media (min-width: 1024px) {
    /* Layout: Switch to Grid */
    .mcq-dashboard-layout {
        flex-direction: row;
    }
    
    /* Show Desktop Sidebar */
    .mcq-desktop-sidebar {
        display: block;
    }

    /* Hide Mobile Elements */
    .mcq-mobile-nav,
    .fab {
        display: none !important;
    }

    .mobile-only {
        display: none !important;
    }

    /* Show Desktop Elements */
    .desktop-only-btn {
        display: inline-flex;
    }

    /* Main Content Adjustments */
    .mcq-main-content {
        padding: 40px;
        max-width: 100%;
        margin: 0;
        padding-bottom: 40px; /* No need for mobile nav space */
    }

    /* Grid Layouts for Cards */
    .courses-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: 24px;
    }

    .requests-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
        gap: 20px;
    }
    
    /* Enhance Course Actions */
    .course-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    /* Quiz Actions */
    .quiz-actions {
        margin-left: auto; /* Push to right */
    }
    .quiz-card {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 20px 30px;
    }
    .quiz-title, .quiz-meta {
        margin: 0;
    }
    .quiz-card > * { margin-bottom: 0; }
    
    /* Notification Positioning */
    .notification-dropdown {
        top: 50px;
        right: 0;
    }
}

/* =========================================
   11. UTILITY CLASSES
   ========================================= */
.text-center { text-align: center; }
.text-muted { color: var(--mcq-text-muted); }
.text-primary { color: var(--mcq-primary); }
.text-success { color: var(--mcq-success); }
.text-danger { color: var(--mcq-danger); }
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 8px !important; }
.mb-2 { margin-bottom: 16px !important; }
.w-100 { width: 100%; }
.d-flex { display: flex; }
.hidden { display: none !important; }

/* =========================================
   12. DARK MODE SUPPORT
   ========================================= */
@media (prefers-color-scheme: dark) {
    :root {
        --mcq-bg: #0f172a;
        --mcq-surface: #1e293b;
        --mcq-text-main: #f1f5f9;
        --mcq-text-muted: #94a3b8;
        --mcq-border: #334155;
    }
    
    .mcq-td-header, 
    .mcq-desktop-sidebar,
    .mcq-mobile-nav,
    .notification-dropdown {
        background: var(--mcq-surface);
        border-color: var(--mcq-border);
    }

    .credits-card {
        background: linear-gradient(135deg, #4338ca 0%, #7c3aed 100%);
    }
    
    .credit-item {
        background: rgba(255, 255, 255, 0.05);
        border-color: rgba(255, 255, 255, 0.1);
    }
    
    .mcq-modal-content {
        background: var(--mcq-surface);
        border: 1px solid var(--mcq-border);
    }
    
    .mcq-form-input {
        background: #0f172a;
        border-color: var(--mcq-border);
        color: white;
    }
    
    .request-item {
        background: #0f172a;
    }
    
    .empty-icon {
        color: #475569;
    }
}