/* ===== MODERN EDUCATION SYSTEM DESIGN 2025 ===== */

/* Modern Color Palette - Dark & Professional */
:root {
    --primary-color: #1e3a8a;
    --primary-dark: #1e40af;
    --secondary-color: #374151;
    --accent-color: #7c3aed;
    --success-color: #059669;
    --warning-color: #d97706;
    --danger-color: #dc2626;
    --info-color: #0891b2;
    --light-color: #f8fafc;
    --dark-color: #0f172a;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-light: #64748b;
    --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #3730a3 100%);
    --gradient-success: linear-gradient(135deg, #059669 0%, #047857 100%);
    --gradient-warning: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    --gradient-danger: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    --gradient-info: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 30px rgba(0,0,0,0.2);
    --border-radius: 12px;
    --border-radius-small: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mobile First Responsive Design */
@media (max-width: 768px) {
    .exam-container {
        padding: 10px;
    }
    
    .exam-header {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .exam-timer {
        font-size: 1.2rem;
    }
    
    .exam-navigation {
        flex-direction: column;
        gap: 10px;
    }
    
    .exam-navigation button {
        width: 100%;
        padding: 12px;
        font-size: 16px;
    }
    
    .question-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }
    
    .question-nav-btn {
        padding: 8px;
        font-size: 14px;
    }
    
    .card {
        margin: 10px 0;
        padding: 15px;
    }
    
    .question-option {
        padding: 12px;
        margin: 8px 0;
        font-size: 16px;
    }
    
    .question-text {
        font-size: 18px;
        line-height: 1.4;
    }
    
    .admin-layout {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .admin-main {
        width: 100%;
        padding: 15px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .content-card {
        padding: 15px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .btn {
        padding: 10px 15px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .question-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .question-nav-btn {
        padding: 6px;
        font-size: 12px;
    }
    
    .exam-header h2 {
        font-size: 1.5rem;
    }
    
    .question-text {
        font-size: 16px;
    }
    
    .question-option {
        padding: 10px;
        font-size: 14px;
    }
}

/* CSS Custom Properties (Variables) */
:root {
    /* Primary Colors */
    --primary-50: #f0f4ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;
    
    /* Secondary Colors */
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;
    
    /* Success Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-200: #bbf7d0;
    --success-300: #86efac;
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    --success-800: #166534;
    --success-900: #14532d;
    
    /* Warning Colors */
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-200: #fde68a;
    --warning-300: #fcd34d;
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;
    --warning-800: #92400e;
    --warning-900: #78350f;
    
    /* Error Colors */
    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-200: #fecaca;
    --error-300: #fca5a5;
    --error-400: #f87171;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --error-700: #b91c1c;
    --error-800: #991b1b;
    --error-900: #7f1d1d;
    
    /* Neutral Colors */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;
    
    /* Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-Index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--neutral-800);
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%),
        linear-gradient(135deg, 
            #667eea 0%, 
            #764ba2 25%, 
            #f093fb 50%, 
            #f5576c 75%, 
            #4facfe 100%);
    min-height: 100vh;
    padding: var(--space-4);
    position: relative;
    overflow-x: hidden;
}

/* Təhsil sistemi üçün Azərbaycan əlifba hərfləri background */
body::before {
    content: 'ا ب ت ث ج ح خ د ذ ر ز س ش ص ض ط ظ ع غ ف ق ك ل م ن ه و ي آ أ إ ؤ ئ ء';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    font-size: 120px;
    font-weight: 100;
    color: rgba(255, 255, 255, 0.03);
    z-index: -1;
    pointer-events: none;
    line-height: 1.2;
    letter-spacing: 0.1em;
    transform: rotate(-15deg);
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow: hidden;
}

/* Riyaziyyat və elm simvolları */
body::after {
    content: '∑ ∫ ∏ ∆ ∇ π α β γ δ ε ζ η θ λ μ ν ξ ο ρ σ τ υ φ χ ψ ω ∞ ± × ÷ = ≠ < > ≤ ≥ ∈ ∉ ⊂ ⊃ ∪ ∩ ∅ ∀ ∃ ∴ ∵';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    font-size: 80px;
    font-weight: 100;
    color: rgba(255, 255, 255, 0.02);
    z-index: -1;
    pointer-events: none;
    line-height: 1.5;
    letter-spacing: 0.2em;
    transform: rotate(15deg);
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(76, 99, 210, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(214, 51, 132, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(220, 53, 69, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 60% 60%, rgba(13, 110, 253, 0.25) 0%, transparent 50%);
    animation: backgroundShift 25s ease-in-out infinite;
    z-index: -1;
}

@keyframes backgroundShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Container Styles */
.container {
    max-width: 600px;
    margin: var(--space-12) auto;
    position: relative;
    z-index: 1;
}

.admin-container {
    display: flex;
    gap: var(--space-6);
    max-width: 1400px;
    margin: 0 auto;
}

/* Card Component */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--space-8);
    border-radius: var(--radius-3xl);
    box-shadow: 
        var(--shadow-2xl),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-6);
    position: relative;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.4) 50%, 
        transparent 100%);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 
        0 32px 64px -12px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--neutral-900);
    margin-bottom: var(--space-6);
    text-align: center;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 2rem;
    color: var(--neutral-800);
}

h3 {
    font-size: 1.5rem;
    color: var(--neutral-700);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-6);
    position: relative;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

label {
    display: block;
    margin-bottom: var(--space-2);
    color: var(--neutral-700);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="file"],
input[type="tel"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    font-size: 1rem;
    font-family: inherit;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
    position: relative;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 
        0 0 0 3px rgba(99, 102, 241, 0.1),
        var(--shadow-lg);
    transform: translateY(-1px);
}

input:hover,
select:hover,
textarea:hover {
    border-color: var(--primary-300);
    background: rgba(255, 255, 255, 0.9);
}

/* Button Component */
.btn {
    padding: var(--space-4) var(--space-6);
    border: none;
    border-radius: var(--radius-xl);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    text-decoration: none;
    letter-spacing: 0.025em;
    backdrop-filter: blur(10px);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.2), 
        transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.btn:active {
    transform: translateY(-1px) scale(0.98);
}

/* Button Variants */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    border: 1px solid var(--primary-600);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    box-shadow: 
        0 20px 25px -5px rgba(99, 102, 241, 0.3),
        0 8px 10px -6px rgba(99, 102, 241, 0.2);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--neutral-500), var(--neutral-600));
    color: white;
    border: 1px solid var(--neutral-600);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--neutral-600), var(--neutral-700));
    box-shadow: 
        0 20px 25px -5px rgba(71, 85, 105, 0.3),
        0 8px 10px -6px rgba(71, 85, 105, 0.2);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-500), var(--success-600));
    color: white;
    border: 1px solid var(--success-600);
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--success-600), var(--success-700));
    box-shadow: 
        0 20px 25px -5px rgba(34, 197, 94, 0.3),
        0 8px 10px -6px rgba(34, 197, 94, 0.2);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-500), var(--warning-600));
    color: white;
    border: 1px solid var(--warning-600);
}

.btn-warning:hover {
    background: linear-gradient(135deg, var(--warning-600), var(--warning-700));
    box-shadow: 
        0 20px 25px -5px rgba(245, 158, 11, 0.3),
        0 8px 10px -6px rgba(245, 158, 11, 0.2);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-500), var(--error-600));
    color: white;
    border: 1px solid var(--error-600);
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--error-600), var(--error-700));
    box-shadow: 
        0 20px 25px -5px rgba(239, 68, 68, 0.3),
        0 8px 10px -6px rgba(239, 68, 68, 0.2);
}

.btn-info {
    background: linear-gradient(135deg, var(--primary-400), var(--primary-500));
    color: white;
    border: 1px solid var(--primary-500);
}

.btn-info:hover {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    box-shadow: 
        0 20px 25px -5px rgba(129, 140, 248, 0.3),
        0 8px 10px -6px rgba(129, 140, 248, 0.2);
}

.btn-lg {
    padding: var(--space-5) var(--space-8);
    font-size: 1.125rem;
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

/* Tab Navigation */
.tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
    border-bottom: 2px solid var(--neutral-200);
    flex-wrap: wrap;
    background: rgba(255, 255, 255, 0.5);
    padding: var(--space-2);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
}

.tab-btn {
    padding: var(--space-4) var(--space-6);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--neutral-600);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: var(--radius-lg);
}

.tab-btn:hover {
    color: var(--primary-600);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.tab-btn:hover::before {
    opacity: 0.1;
}

.tab-btn.active {
    color: white;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    box-shadow: var(--shadow-md);
}

.tab-btn.active::before {
    opacity: 0;
}

.tab-content {
    display: none;
    animation: fadeInUp var(--transition-normal) ease-out;
}

.tab-content.active {
    display: block;
}

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

/* Admin Panel Styles */

/* Section Management */
.section {
    display: none;
}

.section.active {
    display: block;
}

/* Pending Parents Styles */
.pending-parent-item {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border-left: 4px solid #ffc107;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.parent-info {
    flex: 1;
}

.parent-info strong {
    display: block;
    font-size: 18px;
    color: #2c3e50;
    margin-bottom: 8px;
}

.parent-info span {
    display: block;
    color: #6c757d;
    margin-bottom: 4px;
}

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

.btn-approve {
    background: #28a745;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

.btn-approve:hover {
    background: #218838;
}

.btn-reject {
    background: #dc3545;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

.btn-reject:hover {
    background: #c82333;
}

.no-pending {
    text-align: center;
    color: #6c757d;
    font-style: italic;
    padding: 40px;
    background: #f8f9fa;
    border-radius: 10px;
}
.admin-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.admin-header:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.sidebar {
    width: 280px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    height: fit-content;
    transition: all var(--transition-normal);
}

.sidebar:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.sidebar-btn {
    width: 100%;
    padding: var(--space-4);
    margin-bottom: var(--space-3);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.sidebar-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.4), 
        transparent);
    transition: left var(--transition-slow);
}

.sidebar-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--primary-300);
    transform: translateX(4px) translateY(-1px);
    box-shadow: var(--shadow-md);
}

.sidebar-btn:hover::before {
    left: 100%;
}

.sidebar-btn.active {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    border-color: var(--primary-600);
    box-shadow: var(--shadow-lg);
}

.sidebar-btn.active::before {
    opacity: 0;
}

.main-content {
    flex: 1;
}

.section {
    display: none;
    animation: fadeInUp var(--transition-normal) ease-out;
}

.section.active {
    display: block;
}

/* List Items */
.student-item,
.question-item,
.exam-item {
    padding: var(--space-6);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.student-item:hover,
.question-item:hover,
.exam-item:hover {
    border-color: var(--primary-300);
    background: rgba(255, 255, 255, 0.95);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.student-code {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-family: var(--font-family-mono);
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.question-text-preview {
    flex: 1;
    margin-right: var(--space-4);
}

/* Exam Interface Styles */
.exam-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.exam-header:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.exam-header h2 {
    font-size: 1.875rem;
    margin: 0;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.exam-info span {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--neutral-700);
}

#studentName {
    color: var(--primary-600);
    font-size: 1.25rem;
    font-weight: 700;
}

.timer {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-600);
    font-family: var(--font-family-mono);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.timer:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.timer.warning {
    color: var(--error-600);
    background: rgba(239, 68, 68, 0.1);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.8; 
        transform: scale(1.05);
    }
}

.exam-container {
    max-width: 1200px;
    margin: 0 auto;
}

.exam-info {
    display: flex;
    gap: var(--space-8);
    align-items: center;
}

#examScreen {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-6);
}

.exam-sidebar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    height: fit-content;
    max-height: 70vh;
    overflow-y: auto;
    transition: all var(--transition-normal);
}

.exam-sidebar:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.question-nav-item {
    width: 48px;
    height: 48px;
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: var(--space-2);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 600;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.question-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: var(--radius-lg);
}

.question-nav-item:hover {
    border-color: var(--primary-400);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.question-nav-item:hover::before {
    opacity: 0.1;
}

.question-nav-item.answered {
    background: linear-gradient(135deg, var(--success-500), var(--success-600));
    color: white;
    border-color: var(--success-600);
    box-shadow: var(--shadow-md);
}

.question-nav-item.current {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    border-color: var(--primary-600);
    box-shadow: var(--shadow-lg);
    transform: scale(1.1);
}

.exam-main {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.exam-main:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

.question-container {
    min-height: 400px;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-4);
    border-bottom: 2px solid var(--neutral-200);
}

.subject-badge {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.subject-badge:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.question-number {
    color: var(--neutral-600);
    font-weight: 600;
    font-size: 0.875rem;
}

.question-text {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--space-8);
    color: var(--neutral-800);
    font-weight: 500;
}

/* Mathematical formatting */
.question-text sup,
.option-text sup {
    font-size: 0.7em;
    vertical-align: super;
    color: var(--primary-600);
    font-weight: bold;
}

.question-text sub,
.option-text sub {
    font-size: 0.7em;
    vertical-align: sub;
    color: var(--primary-600);
    font-weight: bold;
}

.options {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.option {
    display: flex;
    align-items: center;
    padding: var(--space-5);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(99, 102, 241, 0.1), 
        transparent);
    transition: left var(--transition-slow);
}

.option:hover {
    border-color: var(--primary-400);
    background: rgba(255, 255, 255, 0.95);
    transform: translateX(8px) translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.option:hover::before {
    left: 100%;
}

.option input[type="radio"] {
    width: 24px;
    height: 24px;
    margin-right: var(--space-4);
    cursor: pointer;
    accent-color: var(--primary-500);
}

.option-label {
    font-weight: 700;
    color: var(--primary-600);
    margin-right: var(--space-3);
    font-size: 1.125rem;
    min-width: 32px;
}

.option-text {
    flex: 1;
    font-size: 1rem;
    font-weight: 500;
}

.option input[type="radio"]:checked + .option-label {
    color: var(--primary-600);
}

.option:has(input[type="radio"]:checked) {
    border-color: var(--primary-500);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: 
        0 0 0 3px rgba(99, 102, 241, 0.1),
        var(--shadow-md);
}

.option.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    gap: var(--space-4);
}

.btn-finish {
    width: 100%;
    font-size: 1.125rem;
    padding: var(--space-5);
    font-weight: 700;
}

.btn-finish:hover {
    transform: translateY(-4px) scale(1.03);
}

/* Results Styles */
.results-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin: var(--space-8) 0;
}

.result-item {
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    text-align: center;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.result-item:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-2xl);
}

.result-item.correct {
    background: linear-gradient(135deg, 
        rgba(34, 197, 94, 0.1), 
        rgba(34, 197, 94, 0.05));
    border-color: var(--success-300);
}

.result-item.wrong {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.1), 
        rgba(239, 68, 68, 0.05));
    border-color: var(--error-300);
}

.result-item.unanswered {
    background: linear-gradient(135deg, 
        rgba(245, 158, 11, 0.1), 
        rgba(245, 158, 11, 0.05));
    border-color: var(--warning-300);
}

.result-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--space-3);
    transition: all var(--transition-normal);
}

.result-item:hover .result-number {
    transform: scale(1.1);
}

.result-item.correct .result-number {
    color: var(--success-600);
}

.result-item.wrong .result-number {
    color: var(--error-600);
}

.result-item.unanswered .result-number {
    color: var(--warning-600);
}

.result-label {
    font-size: 1rem;
    color: var(--neutral-600);
    font-weight: 500;
}

.result-rank {
    margin: var(--space-6) 0;
    padding: var(--space-6);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.result-rank:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.result-rank strong {
    color: var(--primary-600);
    font-size: 1.25rem;
}

/* History Styles */
.history-item {
    padding: var(--space-6);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-4);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.history-item:hover {
    border-color: var(--primary-300);
    background: rgba(255, 255, 255, 0.95);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.history-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--neutral-800);
}

.history-date {
    color: var(--neutral-500);
    font-size: 0.875rem;
}

.history-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.stat-item {
    text-align: center;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.8);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Checkbox styles */
input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: var(--space-3);
    cursor: pointer;
    accent-color: var(--primary-500);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-height: 300px;
    overflow-y: auto;
    border: 2px solid var(--neutral-200);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.checkbox-item {
    display: flex;
    align-items: center;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.checkbox-item:hover {
    background: rgba(99, 102, 241, 0.05);
    transform: translateX(4px);
}

/* Status badges */
.status-badge {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-pending {
    background: linear-gradient(135deg, var(--warning-100), var(--warning-200));
    color: var(--warning-800);
}

.status-active {
    background: linear-gradient(135deg, var(--success-100), var(--success-200));
    color: var(--success-800);
}

.status-completed {
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    color: var(--primary-800);
}

/* Parent Panel Styles */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-6);
}

.stat-box {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
    text-align: center;
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.1), 
        transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.stat-box:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-2xl);
}

.stat-box:hover::before {
    opacity: 1;
}

.stat-box .stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--space-3);
    transition: all var(--transition-normal);
}

.stat-box:hover .stat-number {
    transform: scale(1.1);
}

.stat-box .stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 500;
}

.subject-performance-item {
    padding: var(--space-6);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-4);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.subject-performance-item:hover {
    border-color: var(--primary-300);
    background: rgba(255, 255, 255, 0.95);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.subject-performance-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.subject-performance-header h4 {
    margin: 0;
    color: var(--neutral-800);
    font-weight: 600;
}

.performance-badge {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.performance-badge.excellent {
    background: linear-gradient(135deg, var(--success-100), var(--success-200));
    color: var(--success-800);
}

.performance-badge.good {
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    color: var(--primary-800);
}

.performance-badge.average {
    background: linear-gradient(135deg, var(--warning-100), var(--warning-200));
    color: var(--warning-800);
}

.performance-badge.weak {
    background: linear-gradient(135deg, var(--error-100), var(--error-200));
    color: var(--error-800);
}

.performance-badge.failed {
    background: linear-gradient(135deg, var(--error-200), var(--error-300));
    color: var(--error-900);
}

.progress-bar-container {
    width: 100%;
    height: 32px;
    background: var(--neutral-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-3);
    box-shadow: var(--shadow-inner);
}

.progress-bar {
    height: 100%;
    transition: width var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--space-3);
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.2), 
        transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-bar.excellent {
    background: linear-gradient(90deg, var(--success-500), var(--success-400));
}

.progress-bar.good {
    background: linear-gradient(90deg, var(--primary-500), var(--primary-400));
}

.progress-bar.average {
    background: linear-gradient(90deg, var(--warning-500), var(--warning-400));
}

.progress-bar.weak {
    background: linear-gradient(90deg, var(--error-500), var(--error-400));
}

.progress-bar.failed {
    background: linear-gradient(90deg, var(--error-600), var(--error-500));
}

.subject-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--neutral-600);
}

/* Exam start form */
.exam-start-form {
    display: flex;
    gap: var(--space-3);
}

/* Alert/Message styles */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.alert:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.alert-success {
    background: linear-gradient(135deg, 
        rgba(34, 197, 94, 0.1), 
        rgba(34, 197, 94, 0.05));
    color: var(--success-800);
    border-color: var(--success-300);
}

.alert-error {
    background: linear-gradient(135deg, 
        rgba(239, 68, 68, 0.1), 
        rgba(239, 68, 68, 0.05));
    color: var(--error-800);
    border-color: var(--error-300);
}

.alert-info {
    background: linear-gradient(135deg, 
        rgba(59, 130, 246, 0.1), 
        rgba(59, 130, 246, 0.05));
    color: var(--primary-800);
    border-color: var(--primary-300);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet and Mobile (768px and below) */
@media (max-width: 768px) {
    body {
        padding: var(--space-3);
    }

    .container {
        margin: var(--space-6) auto;
        padding: 0 var(--space-3);
    }

    .card {
        padding: var(--space-6);
        border-radius: var(--radius-2xl);
    }

    h1 {
        font-size: 2rem !important;
    }

    h2 {
        font-size: 1.75rem !important;
    }

    h3 {
        font-size: 1.25rem !important;
    }

    .btn-lg {
        padding: var(--space-4) var(--space-6) !important;
        font-size: 1rem !important;
    }

    .admin-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .sidebar-btn {
        padding: var(--space-3);
        font-size: 0.875rem;
    }

    #examScreen {
        grid-template-columns: 1fr;
    }

    .exam-sidebar {
        max-height: none;
        margin-bottom: var(--space-6);
    }

    .exam-header {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }

    .exam-info {
        flex-direction: column;
        gap: var(--space-3);
    }

    .timer {
        font-size: 1.25rem;
    }

    .question-text {
        font-size: 1rem;
    }

    .option {
        padding: var(--space-4);
    }

    .navigation-buttons {
        flex-direction: column;
    }

    .navigation-buttons button {
        width: 100%;
    }

    .results-container {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .history-stats {
        grid-template-columns: 1fr;
    }

    .admin-header {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }

    .admin-header h1 {
        font-size: 1.5rem !important;
    }

    .student-item,
    .question-item,
    .exam-item {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }

    .student-code {
        width: 100%;
        text-align: center;
    }

    /* Input and buttons optimized for mobile */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="number"],
    input[type="tel"],
    select,
    textarea {
        font-size: 16px; /* Prevent iOS zoom */
        padding: var(--space-4);
    }

    .checkbox-group {
        max-height: 200px;
    }

    /* Login options for mobile */
    .login-options {
        gap: var(--space-3);
    }

    /* Admin header mobile */
    .admin-header div {
        text-align: center;
    }

    /* Exam info mobile */
    .exam-main {
        padding: var(--space-4);
    }

    .question-header {
        flex-direction: column;
        gap: var(--space-3);
        align-items: flex-start;
    }

    .subject-performance-header {
        flex-direction: column;
        gap: var(--space-3);
        align-items: flex-start;
    }

    /* Table responsive */
    table {
        font-size: 0.75rem;
    }

    table th,
    table td {
        padding: var(--space-2) !important;
    }
}

/* Small Mobile (480px and below) */
@media (max-width: 480px) {
    body {
        padding: var(--space-2);
    }

    .container {
        margin: var(--space-4) auto;
    }

    .card {
        padding: var(--space-4);
        border-radius: var(--radius-xl);
    }

    .btn {
        padding: var(--space-3) var(--space-4);
        font-size: 0.875rem;
    }

    .btn-lg {
        padding: var(--space-3) var(--space-5) !important;
        font-size: 0.875rem !important;
    }

    .option-text {
        font-size: 0.875rem;
    }

    .option-label {
        font-size: 1rem;
    }

    .question-text {
        font-size: 0.875rem;
    }

    .question-nav-item {
        width: 40px;
        height: 40px;
        font-size: 0.75rem;
        margin: var(--space-1);
    }

    .result-number {
        font-size: 2.25rem;
    }

    .result-label {
        font-size: 0.875rem;
    }

    /* Forms for mobile */
    .form-group label {
        font-size: 0.75rem;
    }

    /* Student/Parent items */
    .student-item > div,
    .student-item > div > div {
        flex-direction: column !important;
        gap: var(--space-2) !important;
    }

    .student-item h4 {
        font-size: 1rem;
    }

    .student-item small {
        font-size: 0.75rem;
    }

    /* Sidebar mobile */
    .sidebar-btn {
        padding: var(--space-3);
        font-size: 0.75rem;
    }
}

/* Large Screens (1200px+) */
@media (min-width: 1200px) {
    .container {
        max-width: 700px;
    }

    .admin-container {
        max-width: 1600px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --neutral-50: #0f172a;
        --neutral-100: #1e293b;
        --neutral-200: #334155;
        --neutral-300: #475569;
        --neutral-400: #64748b;
        --neutral-500: #94a3b8;
        --neutral-600: #cbd5e1;
        --neutral-700: #e2e8f0;
        --neutral-800: #f1f5f9;
        --neutral-900: #f8fafc;
    }
}

/* Print Styles */
@media print {
    body {
        background: white !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
    
    .btn {
        display: none !important;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
.btn:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.sidebar-btn:focus-visible,
.tab-btn:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--neutral-800);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* ===== ADMIN PANEL STYLES ===== */

/* Admin Body */
.admin-body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Admin Header */
.admin-header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo i {
    font-size: 2.5rem;
    color: #3498db;
}

.logo-text h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
}

.logo-text span {
    font-size: 0.9rem;
    color: #bdc3c7;
    font-weight: 400;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.1);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    backdrop-filter: blur(10px);
}

.admin-info i {
    font-size: 1.2rem;
    color: #3498db;
}

.logout-btn {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.logout-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.4);
}

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: calc(100vh - 80px);
}

/* Admin Sidebar */
.admin-sidebar {
    width: 280px;
    background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.3);
    position: sticky;
    top: 80px;
    height: calc(100vh - 80px);
    overflow-y: auto;
}

.sidebar-header {
    padding: 2rem 1.5rem 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: #ecf0f1;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu-item {
    margin: 0;
}

.menu-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: #bdc3c7;
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
    position: relative;
}

.menu-link:hover {
    background: rgba(255,255,255,0.1);
    color: white;
    border-left-color: #3498db;
}

.menu-link.active {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: white;
    border-left-color: #2980b9;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.2);
}

.menu-link i {
    font-size: 1.2rem;
    width: 24px;
    margin-right: 1rem;
}

.menu-link span {
    flex: 1;
    font-weight: 500;
}

.badge {
    background: #3498db;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

.badge.pending {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* Admin Main */
.admin-main {
    flex: 1;
    padding: 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    min-height: calc(100vh - 80px);
}

/* Section */
.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

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

.section-header {
    margin-bottom: 2rem;
}

.section-header h2 {
    margin: 0 0 0.5rem 0;
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-header h2 i {
    color: #3498db;
    font-size: 1.8rem;
}

.section-header p {
    margin: 0;
    color: #7f8c8d;
    font-size: 1.1rem;
}

/* Content Card */
.content-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 1px solid rgba(0,0,0,0.05);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.stat-card:nth-child(1) .stat-icon {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
}

.stat-card:nth-child(2) .stat-icon {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
}

.stat-card:nth-child(3) .stat-icon {
    background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
}

.stat-card:nth-child(4) .stat-icon {
    background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
}

.stat-content h3 {
    margin: 0 0 0.5rem 0;
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
}

.stat-content p {
    margin: 0;
    color: #7f8c8d;
    font-weight: 500;
}

/* List Container */
.list-container {
    min-height: 200px;
}

/* Question Actions */
.question-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.question-actions .btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
    color: white;
}

.btn-info {
    background: linear-gradient(135deg, #17a2b8 0%, #138496 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
        height: auto;
        position: static;
    }
    
    .admin-main {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .question-actions {
        flex-direction: column;
    }
    
    .question-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ===== DROPDOWN MENU STYLES ===== */
.menu-item.has-submenu .submenu {
    display: none;
    background: var(--dark-color);
    border-radius: 0 0 8px 8px;
    margin-top: 2px;
    padding: 5px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}

.menu-item.has-submenu .submenu .menu-item {
    margin: 0;
}

.menu-item.has-submenu .submenu .menu-link {
    padding: 10px 20px 10px 45px;
    font-size: 14px;
    color: #ecf0f1;
    transition: all 0.3s ease;
}

.menu-item.has-submenu .submenu .menu-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

.menu-item.has-submenu .submenu .menu-link i {
    font-size: 8px;
    margin-right: 8px;
    opacity: 0.7;
}

.submenu-arrow {
    transition: transform 0.3s ease;
    margin-left: auto;
    font-size: 12px;
}

.menu-item.has-submenu .menu-link:hover .submenu-arrow {
    color: white;
}

/* Active submenu item */
.menu-item.has-submenu .submenu .menu-link.active {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.menu-item.has-submenu .submenu .menu-link.active i {
    opacity: 1;
}

/* ===== MODERN ADMIN PANEL DESIGN 2025 ===== */

/* Admin Body */
.admin-body {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    min-height: 100vh;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Admin Header */
.admin-header {
    background: var(--gradient-primary);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    box-shadow: var(--shadow-medium);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-left .logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-left .logo i {
    font-size: 2rem;
    color: white;
    background: rgba(255,255,255,0.2);
    padding: 0.8rem;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.logo-text h1 {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo-text span {
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
    font-weight: 400;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    background: rgba(255,255,255,0.1);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-small);
    backdrop-filter: blur(10px);
}

.logout-btn {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
    padding: 0.7rem 1.5rem;
    border-radius: var(--border-radius-small);
    font-weight: 600;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logout-btn:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: calc(100vh - 80px);
}

/* Admin Sidebar */
.admin-sidebar {
    width: 280px;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-right: 1px solid rgba(0,0,0,0.05);
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 80px;
    height: calc(100vh - 80px);
    overflow-y: auto;
}

.sidebar-header {
    padding: 2rem 1.5rem 1rem;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.sidebar-header h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-menu {
    list-style: none;
    padding: 1rem 0;
    margin: 0;
}

.menu-item {
    margin: 0.2rem 1rem;
}

.menu-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
    font-weight: 500;
}

.menu-link:hover {
    background: var(--gradient-primary);
    color: white;
    transform: translateX(5px);
    box-shadow: var(--shadow-light);
}

.menu-link.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.menu-link i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.badge {
    background: var(--gradient-danger);
    color: white;
    padding: 0.3rem 0.7rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: auto;
}

.badge.pending {
    background: var(--gradient-warning);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Admin Main */
.admin-main {
    flex: 1;
    padding: 2rem;
    background: transparent;
}

/* Section */
.section {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.section.active {
    display: block;
}

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

.section-header {
    margin-bottom: 2rem;
}

.section-header h2 {
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-header h2 i {
    background: var(--gradient-primary);
    color: white;
    padding: 0.8rem;
    border-radius: var(--border-radius);
    font-size: 1.2rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0;
}

/* Content Card */
.content-card {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-light);
    border: 1px solid rgba(255,255,255,0.2);
    transition: var(--transition);
}

.content-card:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-light);
    border: 1px solid rgba(255,255,255,0.2);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: white;
}

.stat-card:nth-child(1) .stat-icon { background: var(--gradient-success); }
.stat-card:nth-child(2) .stat-icon { background: var(--gradient-primary); }
.stat-card:nth-child(3) .stat-icon { background: var(--gradient-warning); }
.stat-card:nth-child(4) .stat-icon { background: var(--gradient-danger); }

.stat-content h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
    font-weight: 500;
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-small);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.btn-warning {
    background: var(--gradient-warning);
    color: white;
}

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

/* List Container */
.list-container {
    margin-top: 1rem;
}

/* Grade Buttons */
.grade-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.grade-btn {
    padding: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
}

.grade-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

/* Add Questions Tabs */
.add-questions-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.tab-btn:not(.active) {
    background: rgba(255,255,255,0.8);
    color: var(--text-secondary);
    border: 2px solid rgba(0,0,0,0.1);
}

.tab-btn:not(.active):hover {
    background: rgba(255,255,255,1);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* Form Styles */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid rgba(0,0,0,0.1);
    border-radius: var(--border-radius-small);
    font-size: 1rem;
    transition: var(--transition);
    background: rgba(255,255,255,0.9);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.3rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Upload Instructions */
.upload-instructions {
    background: rgba(255,255,255,0.8);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--success-color);
}

.upload-instructions h4 {
    color: var(--text-primary);
    margin: 0 0 1rem 0;
    font-size: 1.1rem;
}

.format-example {
    overflow-x: auto;
}

.format-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--border-radius-small);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.format-table th,
.format-table td {
    padding: 0.8rem;
    text-align: left;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.format-table th {
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
}

.format-table td {
    background: white;
    color: var(--text-primary);
}

/* Subject Cards */
.subject-card {
    background: rgba(255,255,255,0.95);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-light);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.subject-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.subject-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.subject-count {
    background: var(--gradient-primary);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.questions-grid {
    display: grid;
    gap: 1rem;
}

.question-item {
    background: rgba(255,255,255,0.8);
    padding: 1rem;
    border-radius: var(--border-radius-small);
    border: 1px solid rgba(0,0,0,0.1);
    transition: var(--transition);
    position: relative;
}

.question-item:hover {
    background: rgba(255,255,255,1);
    transform: translateX(5px);
}

.question-number {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--gradient-primary);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: var(--shadow-medium);
}

.question-index {
    font-size: 0.8rem;
}

.question-text {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.question-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
    margin-bottom: 0.8rem;
}

.option {
    padding: 0.5rem;
    border-radius: 6px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.option.correct {
    background: rgba(5, 150, 105, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.option.incorrect {
    background: rgba(220, 38, 38, 0.1);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

/* Answer feedback styles for exam */
.option.correct-answer {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.05));
    border: 2px solid #22c55e;
    color: #15803d;
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2);
    transform: scale(1.02);
    animation: correctPulse 0.6s ease-out;
}

.option.wrong-answer {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(239, 68, 68, 0.05));
    border: 2px solid #ef4444;
    color: #dc2626;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
    transform: scale(1.02);
    animation: wrongShake 0.6s ease-out;
}

.option.selected-answer {
    background: rgba(156, 163, 175, 0.1);
    border: 1px solid #9ca3af;
    color: #6b7280;
    opacity: 0.7;
}

@keyframes correctPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1.02); }
}

@keyframes wrongShake {
    0%, 100% { transform: scale(1.02) translateX(0); }
    25% { transform: scale(1.02) translateX(-5px); }
    75% { transform: scale(1.02) translateX(5px); }
}

.question-actions {
    display: flex;
    gap: 0.5rem;
}

.question-actions button {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 6px;
}

/* Bulk Actions */
.bulk-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    background: rgba(255,255,255,0.8);
    border-radius: var(--border-radius-small);
    margin-bottom: 1rem;
    border-left: 4px solid var(--danger-color);
}

.bulk-actions button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--border-radius-small);
    transition: var(--transition);
}

.bulk-actions button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Question Selection */
.question-item {
    position: relative;
}

.question-checkbox {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 20px;
    height: 20px;
    cursor: pointer;
    z-index: 10;
}

.question-item.selected {
    background: rgba(30, 58, 138, 0.1);
    border-color: var(--primary-color);
    border-width: 2px;
}

.question-item.selected .question-text {
    color: var(--primary-color);
    font-weight: 700;
}

/* Responsive Design */
@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
        height: auto;
        position: static;
    }
    
    .admin-main {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .grade-buttons {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .add-questions-tabs {
        flex-direction: column;
    }
    
    .questions-grid {
        grid-template-columns: 1fr;
    }
    
    .question-options {
        grid-template-columns: 1fr;
    }
}

/* Serious admin theme (darker) */
body.serious {
	--primary-500: #0a58ca; /* darker primary */
	--primary-600: #0947a4;
	--bg-color: #070a12; /* darker background */
	--panel-bg: #08101b; /* darker panel */
	--card-bg: #060a11; /* darker cards */
	--border-color: #0f172a; /* deep slate */
	--text-color: #e2e8f0; /* light text */
	--muted: #94a3b8; /* slate-400 */
	background: var(--bg-color);
	color: var(--text-color);
}

body.serious .sidebar {
	background: var(--panel-bg);
	border-right: 1px solid var(--border-color);
}

body.serious .sidebar .sidebar-btn {
	background: transparent;
	color: var(--text-color);
	border: 1px solid transparent;
}
body.serious .sidebar .sidebar-btn.active,
body.serious .sidebar .sidebar-btn:hover {
	background: #0a1322;
	border-color: var(--border-color);
}

body.serious .main-content .card {
	background: var(--card-bg);
	border: 1px solid var(--border-color);
	color: var(--text-color);
}

/* Admin toolbar (darker) */
.admin-toolbar {
	position: sticky;
	top: 0;
	z-index: 1000;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	padding: 12px 16px;
	background: #070e19; /* darker */
	border-bottom: 1px solid var(--border-color);
	box-shadow: 0 2px 12px rgba(0,0,0,0.5);
	margin-bottom: 16px;
}
.admin-title { margin: 0; font-size: 18px; color: var(--text-color); }
.toolbar-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Buttons tweak for serious theme (darker) */
body.serious .btn { border: 1px solid var(--border-color); filter: saturate(0.9); }
body.serious .btn-success { background: #15803d; border-color: #065f2a; color: #fff; }
body.serious .btn-info { background: #0369a1; border-color: #075985; color: #fff; }
body.serious .btn-warning { background: #b45309; border-color: #92400e; color: #fef3c7; }
body.serious .btn-danger { background: #b91c1c; border-color: #7f1d1d; color: #fff; }

/* Inputs (darker) */
body.serious input, body.serious select, body.serious textarea {
	background: #0a0f1a;
	border: 1px solid var(--border-color);
	color: var(--text-color);
}

/* Lighter background for serious theme */
html.serious, body.serious {
	background-color: #1e293b; /* lighter dark */
	background-image: none;
}

body.serious {
	--bg-color: #1e293b; /* override to lighter dark */
}

/* ===== MODERN ADMIN PANEL REDESIGN ===== */

/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    overflow-x: hidden;
}

/* Serious theme enforcement */
html.serious, body.serious {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    color: #1f2937;
}

/* ===== LAYOUT SYSTEM ===== */
.admin-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
    gap: 0;
}

/* ===== HEADER ===== */
.admin-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    border-bottom: 1px solid #e2e8f0;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

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

.header-left .logo i {
    font-size: 28px;
    color: #3b82f6;
}

.logo-text h1 {
    font-size: 24px;
    font-weight: 800;
    color: #1f2937;
    margin: 0;
}

.logo-text span {
    font-size: 14px;
    color: #6b7280;
    font-weight: 500;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 12px;
    color: #93c5fd;
    font-weight: 600;
}

.logout-btn {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logout-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.3);
}

/* ===== TOOLBAR ===== */
.admin-toolbar {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-bottom: 1px solid #334155;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.admin-title {
    font-size: 20px;
    font-weight: 700;
    color: #f8fafc;
    margin: 0;
}

.toolbar-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ===== SIDEBAR ===== */
.admin-sidebar {
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border-right: 1px solid #e2e8f0;
    padding: 24px 0;
    height: 100vh;
    overflow-y: auto;
    position: sticky;
    top: 0;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
}

.sidebar-header {
    padding: 0 24px 20px;
    border-bottom: 1px solid #e2e8f0;
    margin-bottom: 20px;
}

.sidebar-header h3 {
    color: #1f2937;
    font-size: 18px;
    font-weight: 700;
    margin: 0;
}

.sidebar-menu {
    list-style: none;
    padding: 0 16px;
}

.menu-item {
    margin-bottom: 4px;
}

.menu-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    color: #6b7280;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.2s ease;
    position: relative;
    border: 1px solid transparent;
}

.menu-link:hover {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
    border-color: rgba(59, 130, 246, 0.2);
    transform: translateX(4px);
}

.menu-link.active {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.menu-link i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.badge {
    background: #3b82f6;
    color: white;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 12px;
    margin-left: auto;
}

.badge.pending {
    background: #f59e0b;
    color: #92400e;
}

/* ===== MAIN CONTENT ===== */
.admin-main {
    padding: 32px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    min-height: calc(100vh - 120px);
}

.section {
    display: none;
}

.section.active {
    display: block;
}

.section-header {
    margin-bottom: 32px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: #1f2937;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-header p {
    color: #6b7280;
    font-size: 16px;
    font-weight: 500;
}

/* ===== CARDS ===== */
.content-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    margin-bottom: 24px;
}

/* ===== STATS GRID ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6, #06b6d4);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
    border-color: #cbd5e1;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.stat-content h3 {
    font-size: 36px;
    font-weight: 800;
    color: #1f2937;
    margin: 0;
    line-height: 1;
}

.stat-content p {
    color: #6b7280;
    font-size: 14px;
    font-weight: 600;
    margin: 4px 0 0 0;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.btn-info {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: #92400e;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(107, 114, 128, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(107, 114, 128, 0.4);
}

/* ===== FORMS ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #1f2937;
    font-weight: 600;
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    color: #1f2937;
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background: #ffffff;
}

/* ===== LISTS ===== */
.list-container {
    display: grid;
    gap: 16px;
}

.list-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.2s ease;
}

.list-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    border-color: #cbd5e1;
}

/* ===== SCROLLBARS ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .admin-layout {
        grid-template-columns: 1fr;
    }
    
    .admin-sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease;
    }
    
    .admin-sidebar.open {
        left: 0;
    }
    
    .admin-main {
        padding: 20px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .admin-header {
        padding: 12px 16px;
    }
    
    .admin-toolbar {
        padding: 12px 16px;
        flex-direction: column;
        gap: 12px;
    }
    
    .toolbar-actions {
        width: 100%;
        justify-content: center;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
}