/* ============================================
   Assessment Portal — Design System
   Dark theme, glassmorphism, premium feel
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Colors */
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --bg-glass: rgba(255, 255, 255, 0.06);
    --border-glass: rgba(255, 255, 255, 0.1);
    --border-glass-hover: rgba(255, 255, 255, 0.18);

    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b85;
    --text-accent: #c4b5fd;

    --accent-primary: #8b5cf6;
    --accent-primary-hover: #7c3aed;
    --accent-secondary: #06b6d4;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    --accent-gradient-hover: linear-gradient(135deg, #7c3aed 0%, #0891b2 100%);

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.12);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* 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;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    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);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Animated background gradient orbs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.3;
    z-index: -1;
    animation: float 20s ease-in-out infinite;
}

body::before {
    width: 600px;
    height: 600px;
    background: var(--accent-primary);
    top: -200px;
    right: -200px;
}

body::after {
    width: 500px;
    height: 500px;
    background: var(--accent-secondary);
    bottom: -150px;
    left: -150px;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(-30px, 30px) scale(1.05); }
    50% { transform: translate(20px, -20px) scale(0.95); }
    75% { transform: translate(-20px, -30px) scale(1.02); }
}

/* --- App Container --- */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Navigation --- */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-8);
    background: rgba(10, 10, 26, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.navbar-brand .brand-icon {
    width: 36px;
    height: 36px;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    padding: var(--space-8);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* --- Page Header --- */
.page-header {
    margin-bottom: var(--space-8);
}

.page-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
}

.page-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

/* --- Glass Card --- */
.card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-normal);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glass-hover);
    box-shadow: var(--shadow-glow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-glass);
}

.card-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.card-body {
    color: var(--text-secondary);
}

/* --- Grid Layout --- */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* --- Stats Cards --- */
.stat-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: var(--border-glass-hover);
}

.stat-card .stat-value {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card .stat-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-top: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 2px 12px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    background: var(--accent-gradient-hover);
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glass-hover);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.4);
}

.btn-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.btn-success:hover {
    background: rgba(16, 185, 129, 0.2);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
    border-radius: var(--radius-lg);
}

.btn-block {
    width: 100%;
}

/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
    background: rgba(255, 255, 255, 0.08);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

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

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a0a0b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    cursor: pointer;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.form-check label {
    cursor: pointer;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

/* Scale input (1-5) */
.scale-group {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.scale-option {
    position: relative;
}

.scale-option input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.scale-option label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--bg-glass);
    border: 2px solid var(--border-glass);
    color: var(--text-secondary);
    font-weight: 700;
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.scale-option input:checked + label {
    background: var(--accent-gradient);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: 0 0 16px rgba(139, 92, 246, 0.3);
    transform: scale(1.1);
}

.scale-option label:hover {
    border-color: var(--accent-primary);
    background: rgba(139, 92, 246, 0.1);
    transform: scale(1.05);
}

/* --- Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-pre {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.25);
}

.badge-post {
    background: rgba(139, 92, 246, 0.15);
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.25);
}

.badge-active {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.badge-inactive {
    background: rgba(107, 107, 133, 0.15);
    color: var(--text-muted);
    border: 1px solid rgba(107, 107, 133, 0.25);
}

/* --- Tables --- */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-glass);
}

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

thead th {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--space-4) var(--space-5);
    text-align: left;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-glass);
}

tbody td {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

tbody tr {
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* --- Flash Messages --- */
.flash {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: 500;
    animation: slideDown 0.3s ease;
}

.flash-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.flash-error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.flash-info {
    background: var(--info-bg);
    color: var(--info);
    border: 1px solid rgba(59, 130, 246, 0.25);
}

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

/* --- Auth Page (Login/Access Code) --- */
.auth-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-4);
}

.auth-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    width: 100%;
    max-width: 420px;
    text-align: center;
    animation: fadeInUp 0.5s ease;
}

.auth-card .auth-icon {
    width: 64px;
    height: 64px;
    background: var(--accent-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    margin: 0 auto var(--space-6);
    box-shadow: var(--shadow-glow);
}

.auth-card h1 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: var(--space-2);
}

.auth-card .auth-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    font-size: var(--font-size-sm);
}

.auth-card .form-input {
    text-align: center;
    font-size: var(--font-size-lg);
    letter-spacing: 0.15em;
    padding: var(--space-4);
}

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

/* --- Assessment Cards Grid --- */
.assessment-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    animation: fadeInUp 0.4s ease backwards;
}

.assessment-card:nth-child(1) { animation-delay: 0s; }
.assessment-card:nth-child(2) { animation-delay: 0.05s; }
.assessment-card:nth-child(3) { animation-delay: 0.1s; }
.assessment-card:nth-child(4) { animation-delay: 0.15s; }
.assessment-card:nth-child(5) { animation-delay: 0.2s; }
.assessment-card:nth-child(6) { animation-delay: 0.25s; }

.assessment-card:hover {
    border-color: var(--border-glass-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.assessment-card .card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.assessment-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    line-height: 1.3;
}

.assessment-card .card-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    flex: 1;
}

.assessment-card .card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.assessment-card .card-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: auto;
}

/* --- Question Builder (Admin) --- */
.question-builder {
    margin-top: var(--space-6);
}

.question-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    transition: all var(--transition-normal);
    animation: fadeInUp 0.3s ease;
    position: relative;
}

.question-item:hover {
    border-color: var(--border-glass-hover);
}

.question-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    gap: var(--space-3);
}

.question-header .question-number {
    background: var(--accent-gradient);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.question-header .question-controls {
    display: flex;
    gap: var(--space-2);
}

.question-body {
    display: grid;
    gap: var(--space-4);
}

.question-body .row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-4);
}

@media (max-width: 640px) {
    .question-body .row {
        grid-template-columns: 1fr;
    }
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

.option-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.option-row .form-input {
    flex: 1;
}

.option-row .btn-remove-option {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: var(--font-size-lg);
}

.option-row .btn-remove-option:hover {
    color: var(--danger);
    background: var(--danger-bg);
}

/* --- Assessment Form (Public) --- */
.assessment-form {
    max-width: 800px;
    margin: 0 auto;
}

.assessment-form .form-question {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-5);
    animation: fadeInUp 0.4s ease backwards;
}

.assessment-form .form-question:nth-child(1) { animation-delay: 0.05s; }
.assessment-form .form-question:nth-child(2) { animation-delay: 0.1s; }
.assessment-form .form-question:nth-child(3) { animation-delay: 0.15s; }
.assessment-form .form-question:nth-child(4) { animation-delay: 0.2s; }
.assessment-form .form-question:nth-child(5) { animation-delay: 0.25s; }

.assessment-form .question-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
}

.assessment-form .question-title .q-number {
    color: var(--accent-primary);
    font-weight: 800;
    flex-shrink: 0;
}

.assessment-form .question-title .required-marker {
    color: var(--danger);
    margin-left: var(--space-1);
}

/* --- Response Viewer --- */
.response-detail {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
}

.response-detail .answer-item {
    padding: var(--space-4) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.response-detail .answer-item:last-child {
    border-bottom: none;
}

.response-detail .answer-question {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.response-detail .answer-value {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 500;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-6);
    color: var(--text-muted);
}

.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state p {
    margin-bottom: var(--space-6);
}

/* --- Thank You Page --- */
.thank-you {
    text-align: center;
    padding: var(--space-12);
    max-width: 500px;
    margin: 0 auto;
    animation: fadeInUp 0.5s ease;
}

.thank-you .check-icon {
    width: 80px;
    height: 80px;
    background: var(--success-bg);
    border: 2px solid var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto var(--space-6);
    animation: popIn 0.5s ease 0.2s backwards;
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.thank-you h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--space-4);
}

.thank-you p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-8);
}

/* --- Toggle Switch --- */
.toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.toggle input:checked + .toggle-slider {
    background: var(--accent-primary);
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

/* --- Utilities --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.text-center { text-align: center; }
.text-sm { font-size: var(--font-size-sm); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-danger { color: var(--danger); }
.font-bold { font-weight: 700; }
.w-full { width: 100%; }
.hidden { display: none !important; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .main-content {
        padding: var(--space-4);
    }

    .navbar {
        padding: var(--space-3) var(--space-4);
    }

    .page-header h1 {
        font-size: var(--font-size-2xl);
    }

    .auth-card {
        padding: var(--space-6);
    }

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

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

    .scale-group {
        flex-wrap: wrap;
    }
}

/* --- Loading Spinner --- */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* --- Modal / Confirm Dialog --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    max-width: 420px;
    width: 100%;
    text-align: center;
    animation: fadeInUp 0.3s ease;
}

.modal-content h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-3);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.modal-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}