:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #eef2ff;
    --secondary: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1e293b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
    --transition: .2s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding-top: 90px;
    padding-bottom: 40px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== NAVBAR ===== */
.navbar {
    background: rgba(255,255,255,.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 64px;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none !important;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-links a {
    color: var(--gray-600);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-links a:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-600);
    cursor: pointer;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none !important;
    line-height: 1.4;
}

.btn-primary {
    background: var(--primary);
    color: #fff !important;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: var(--success);
    color: #fff !important;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--danger);
    color: #fff !important;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.btn-warning {
    background: var(--warning);
    color: #fff !important;
}

.btn-warning:hover {
    background: #d97706;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--gray-300);
    color: var(--gray-700) !important;
}

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

.btn-google {
    background: #fff;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-google:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* ===== CARDS ===== */
.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--gray-200);
    background: var(--gray-50);
}

/* ===== FORMS ===== */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--gray-700);
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: var(--transition);
    background: #fff;
    font-family: inherit;
}

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

.form-control.error {
    border-color: var(--danger);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

.form-help {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ===== GRID LAYOUTS ===== */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: 1fr 1fr;
}

.grid-3 {
    grid-template-columns: 1fr 1fr 1fr;
}

.grid-4 {
    grid-template-columns: 1fr 1fr 1fr 1fr;
}

/* ===== STATS CARDS ===== */
.stat-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.blue { background: #eef2ff; color: var(--primary); }
.stat-icon.green { background: #ecfdf5; color: var(--success); }
.stat-icon.yellow { background: #fffbeb; color: var(--warning); }
.stat-icon.red { background: #fef2f2; color: var(--danger); }
.stat-icon.purple { background: #f5f3ff; color: #8b5cf6; }
.stat-icon.cyan { background: #ecfeff; color: var(--secondary); }

.stat-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-info p {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 2px;
}

/* ===== TABLES ===== */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
    font-size: 14px;
}

th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-600);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: .5px;
}

tr:hover {
    background: var(--gray-50);
}

/* ===== BADGES ===== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}

.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }
.badge-info { background: #cffafe; color: #155e75; }

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: .5;
}

.empty-state h3 {
    font-size: 1.2rem;
    color: var(--gray-700);
    margin-bottom: 8px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-md);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .main-content {
        padding-top: 80px;
    }
}

/* ===== FOOTER ===== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 40px 0 20px;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 12px;
    font-size: 1.2rem;
}

.footer-section h4 {
    color: #fff;
    margin-bottom: 12px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section a {
    color: var(--gray-400);
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
}

.footer-section a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 20px;
    text-align: center;
    font-size: 14px;
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* ===== PAGE SPECIFIC ===== */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== MODAL ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 24px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.modal-header h2 {
    font-size: 1.2rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-400);
}

/* ===== LOADING ===== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== QUESTION EDITOR ===== */
.question-card {
    background: #fff;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    position: relative;
    transition: var(--transition);
}

.question-card:hover {
    border-color: var(--gray-300);
}

.question-card .q-number {
    position: absolute;
    top: -12px;
    left: 16px;
    background: var(--primary);
    color: #fff;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
}

.choice-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    padding: 8px 12px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.choice-row input[type="radio"],
.choice-row input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.choice-row input[type="text"] {
    flex: 1;
    border: 1px solid var(--gray-200);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 14px;
}

/* ===== QUILL OVERRIDES ===== */
.ql-editor {
    min-height: 100px;
    font-size: 15px;
}

.ql-toolbar {
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    border-color: var(--gray-200) !important;
}

.ql-container {
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    border-color: var(--gray-200) !important;
}

.math-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary-light);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    font-weight: 600;
}