/* ==========================================================================
   CSS Design System: EduTest Platform
   Theme: Modern Futuristic Dark with Glowing Backdrops (Premium Look)
   ========================================================================== */

:root {
    /* Color Palette (Чиста, ніжна та контрасна версія EduTest) */
    --bg-light: #ffffff;
    --bg-gradient: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
    
    /* Центральний блок – тепер чистий, ніжний небесно-блакитний колір */
    --bg-card: #e3f2fd; 
    --border-color: #cdddf7;
    --border-hover: #b3d4fc;
    
    /* Текст головної сторінки */
    --text-primary: #0f172a;   /* Глибокий темний для назви "Кабінет вчителя" */
    --text-secondary: #334155; /* Для опису під заголовком */
    
    /* Текст всередині ніжно-блакитного центрального блоку */
    --text-card-main: #1e3a8a; /* Насичений темно-синій для назви тесту */
    --text-muted: #475569;     /* Чіткий темний колір для "Запитань: 4", "Здано разів: 0" */

    /* Вкладки (Tabs) – Повертаємо яскравість та видимість */
    --text-tab-active: #4f46e5;   /* Яскравий індиго/фіолетовий для активної вкладки */
    --text-tab-inactive: #64748b; /* Неактивні вкладки тепер ЧІТКО видимі (темно-сірі) */

    /* Кнопки та акценти */
    --primary: #6b87e8; /* Світла кнопка "Створити тест" */
    --text-btn-primary: #4f46e5;
    --primary-glow: rgba(79, 70, 229, 0.1);
    
    /* Елементи профілю (Повертаємо контраст плашці ролі) */
    --bg-role-teacher: #4f46e5;   /* Насичений колір для плашки "ВЧИТЕЛЬ" */
    --text-role-teacher: #ffffff; /* Білий текст на насиченому фоні */
    
    --secondary: #ff006e;
    --secondary-glow: rgba(255, 0, 110, 0.15);

    --success: #10b981; /* Зелена кнопка "Провести" */
    --success-glow: rgba(16, 185, 129, 0.2);
    
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Фірмові яскраві градієнти (Для логотипа EduTest та веселкового вайбу) */
    --gradient-hero: linear-gradient(135deg, #9d4edd 0%, #ff006e 100%); 
    --gradient-glow: linear-gradient(90deg, #ff006e, #ffd166, #06d6a0, #118ab2, #9d4edd);
    
    /* Модальне вікно (Overlay) */
    --modal-overlay: rgba(15, 23, 42, 0.25); 
    --blur-effect: blur(8px);
    --bg-modal-card: #ffffff; 

    /* Layout & Styling Details */
    --font-primary: 'Inter', system-ui, sans-serif;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-premium: 0 10px 25px -5px rgba(15, 23, 42, 0.04);
}

/* ==========================================================================
   Base & Layout Reset
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background: var(--bg-gradient);
    color: var(--text-primary);
    font-family: var(--font-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* Background Glowing Orbs */
.bg-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.45;
    pointer-events: none;
}

.bg-glow-1 {
    width: 500px;
    height: 500px;
    background: rgba(255, 0, 110, 0.15);
    top: -150px;
    left: -150px;
}

.bg-glow-2 {
position: fixed;
    width: 600px;
    height: 600px;
    background: rgba(255, 209, 102, 0.15);
    bottom: -100px;
    right: -100px;
}

.bg-glow-3 {
    width: 400px;
    height: 400px;
    background: rgba(157, 78, 221, 0.1);
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   Typography & Headers
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.02em;
}

p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.gradient-text {
    background: var(--gradient-glow);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================================================
   Navigation Bar (Header)
   ========================================================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 0;
    transition: var(--transition-fast);
}

.nav-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    cursor: pointer;
    user-select: none;
    transition: var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    font-size: 1.75rem;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-highlight {
    background: var(--gradient-glow);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-user-info {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    animation: fadeIn var(--transition-fast) ease;
}

.user-badge {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.user-badge i {
    color: var(--primary);
}

.role-lbl {
    font-size: 0.75rem;
    background: var(--primary);
    color: white;
    padding: 0.1rem 0.5rem;
    border-radius: 10px;
    text-transform: uppercase;
    font-weight: 700;
}

/* ==========================================================================
   Buttons System
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
    outline: none;
    user-select: none;
}

.btn-primary {
    background: rgba(224, 242, 254, 0.95);
    color: var(--text-primary);
    border: 2px solid transparent;
    background-clip: padding-box;
    box-shadow: 0 4px 14px var(--primary-glow);
    position: relative;
    z-index: 1;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    background: var(--rainbow-border);
    z-index: -1;
    border-radius: calc(var(--radius-md) + 2px);
    transition: var(--transition-fast);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

.btn-primary:hover::before {
    filter: brightness(1.2);
}

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

.btn-secondary {
    background: var(--secondary);
    color: #fff;
    box-shadow: 0 4px 14px var(--secondary-glow);
}

.btn-secondary:hover {
    background: hsl(280, 75%, 65%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--secondary-glow);
}

.btn-success {
    background: var(--success);
    color: #fff;
    box-shadow: 0 4px 14px var(--success-glow);
}

.btn-success:hover {
    background: hsl(158, 65%, 50%);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
    color: #000;
    transform: translateY(-2px);
}

.btn-logout {
    background: hsla(350, 80%, 60%, 0.1);
    color: var(--danger);
    border: 1px solid hsla(350, 80%, 60%, 0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.btn-logout:hover {
    background: var(--danger);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px hsla(350, 80%, 60%, 0.3);
}

.btn-block {
    width: 100%;
}

/* ==========================================================================
   Screen Management (Single Page App)
   ========================================================================== */
.main-content {
    flex: 1;
    width: 90%;
    max-width: 1200px;
    margin: 2.5rem auto;
    position: relative;
}

.screen {
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity var(--transition-smooth) ease, transform var(--transition-smooth) ease;
}

.screen.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Screen 1: Hero & Role Selection
   ========================================================================== */
.hero-section {
    text-align: center;
    margin-bottom: 4rem;
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    line-height: 1.15;
    margin-bottom: 1.25rem;
    font-weight: 800;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    max-width: 600px;
    margin: 0 auto;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    max-width: 900px;
    margin: 0 auto;
}

/* Role Cards Design */
.role-card {
    background: var(--bg-card);
    border: 2px solid transparent;
    background-clip: padding-box;
    border-radius: var(--radius-lg);
    padding: 3rem 2.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    box-shadow: var(--shadow-premium);
    transition: var(--transition-smooth);
}

.role-card::after {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    background: var(--rainbow-border);
    z-index: -2;
    border-radius: calc(var(--radius-lg) + 2px);
    opacity: 0.5;
    transition: var(--transition-smooth);
}

.role-card:hover::after {
    opacity: 1;
}

.role-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: var(--transition-smooth);
    z-index: -1;
}

.card-teacher::before {
    background: var(--gradient-card-teacher);
}

.card-student::before {
    background: var(--gradient-card-student);
}

.card-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    transition: var(--transition-smooth);
}

.card-teacher .card-icon-wrapper {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.card-student .card-icon-wrapper {
    background: rgba(192, 38, 211, 0.1);
    color: var(--secondary);
    border: 1px solid rgba(192, 38, 211, 0.2);
}

.role-card h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    transition: var(--transition-fast);
}

.role-card p {
    font-size: 0.95rem;
    margin-bottom: 2.5rem;
}

.card-arrow {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    opacity: 0.8;
    transition: var(--transition-smooth);
}

.card-teacher .card-arrow { color: var(--primary); }
.card-student .card-arrow { color: var(--secondary); }

/* Role Card Hover Effects */
.role-card:hover {
    transform: translateY(-8px) scale(1.01);
    border-color: var(--border-hover);
    box-shadow: 0 30px 60px -15px rgba(99, 102, 241, 0.15);
}

.role-card:hover::before {
    opacity: 1;
}

.role-card:hover .card-icon-wrapper {
    transform: scale(1.1) rotate(5deg);
}

.card-teacher:hover .card-icon-wrapper {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 0 20px var(--primary-glow);
}

.card-student:hover .card-icon-wrapper {
    background: var(--secondary);
    color: #fff;
    box-shadow: 0 0 20px var(--secondary-glow);
}

.role-card:hover .card-arrow {
    gap: 0.85rem;
    opacity: 1;
}

/* ==========================================================================
   Premium Glassmorphism Cards
   ========================================================================== */
.glass-card {
    background: var(--bg-card);
    border: 2px solid transparent;
    background-clip: padding-box;
    border-radius: var(--radius-lg);
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    box-shadow: var(--shadow-premium);
    position: relative;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    background: var(--rainbow-border);
    z-index: -1;
    border-radius: calc(var(--radius-lg) + 2px);
    pointer-events: none;
    opacity: 0.8;
}

/* ==========================================================================
   Dashboards Shared Layout
   ========================================================================== */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.dashboard-title {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
}

.dashboard-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2rem;
}

@media (max-width: 992px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

.dash-card {
    display: flex;
    flex-direction: column;
    min-height: 450px;
}

.card-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.count-badge {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
}

/* ==========================================================================
   Teacher Dashboard Views, Tabs & List
   ========================================================================== */
.tabs-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom: 2px solid;
    border-image: var(--rainbow-border) 1;
}

.tab-content {
    display: none;
    animation: fadeIn var(--transition-fast) ease;
}

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

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.pagination-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--primary);
    border-color: var(--primary);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.tests-list {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    flex: 1;
    
}

.test-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.test-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.test-item-info h4 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}

.test-item-meta {
    display: flex;
    gap: 1.25rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.test-item-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.test-item-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-icon-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

/* Empty state design */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    gap: 1rem;
    height: 100%;
    margin: auto;
}

.empty-state i {
    font-size: 3rem;
    opacity: 0.3;
}

.empty-state p {
    font-size: 0.95rem;
    max-width: 280px;
}

/* Results Table */
.results-table-wrapper {
    flex: 1;
    overflow-x: auto;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.results-table th, .results-table td {
    padding: 1.15rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.results-table th {
    background: rgba(0, 0, 0, 0.15);
    color: var(--text-secondary);
    font-weight: 600;
}

.results-table tbody tr {
    transition: var(--transition-fast);
}

.results-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.py-4 { padding-top: 2rem; padding-bottom: 2rem; }

.grade-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.85rem;
}

.grade-excelent {
    background: rgba(16, 185, 129, 0.15);
    color: hsl(158, 65%, 45%);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.grade-good {
    background: rgba(59, 130, 246, 0.15);
    color: hsl(217, 91%, 60%);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.grade-satisfactory {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.grade-poor {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ==========================================================================
   Student Dashboard Specifics
   ========================================================================== */
.student-test-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.student-test-card:hover {
    border-color: var(--success);
    background: rgba(255, 255, 255, 0.04);
}

.grades-list {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    flex: 1;
    max-height: 450px;
}

.grade-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.grade-item-info h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.grade-item-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Modals Backdrop & Container
   ========================================================================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(4, 7, 18, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast) ease;
}

.modal-backdrop.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    width: 90%;
    max-width: 500px;
    padding: 3rem 2.5rem;
    position: relative;
    transform: scale(0.95);
    transition: transform var(--transition-fast) ease;
}

.modal-lg {
    max-width: 750px;
    max-height: 85vh;
    overflow-y: auto;
}

.modal-backdrop.active .modal-container {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close-btn:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.modal-icon {
    font-size: 2.5rem;
    color: var(--primary);
    text-align: center;
    margin-bottom: 1.5rem;
}

.modal-title {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.modal-subtitle {
    font-size: 0.95rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2.25rem;
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Forms Inputs */
input[type="text"], select {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.85rem 1.2rem;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
    width: 100%;
}

input[type="text"]:focus, select:focus {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Input with icon */
.input-icon-wrapper {
    position: relative;
}

.input-icon-wrapper input {
    padding-left: 2.75rem;
}

.input-icon {
    position: absolute;
    left: 1.1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

/* ==========================================================================
   Question Builder (Create Test Modal)
   ========================================================================== */
.questions-section {
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
    padding-top: 1.5rem;
}

.questions-section h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.question-builder-card {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    animation: slideDown 0.3s ease;
}

.btn-remove-question {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background: transparent;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.1rem;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.btn-remove-question:hover {
    opacity: 1;
    transform: scale(1.1);
}

.builder-options-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1rem 0;
}

.dynamic-option-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
}

.dynamic-option-row input[type="text"] {
    flex: 1;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    padding: 0.4rem 0.25rem;
    color: var(--text-primary);
}

.dynamic-option-row input[type="text"]:focus {
    border-bottom-color: var(--primary);
    box-shadow: none;
    background: transparent;
}

.dynamic-option-row input[type="radio"],
.dynamic-option-row input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    cursor: pointer;
    outline: none;
    transition: var(--transition-fast);
}

.dynamic-option-row input[type="radio"] {
    border-radius: 50%;
}
.dynamic-option-row input[type="checkbox"] {
    border-radius: 4px;
}

.dynamic-option-row input[type="radio"]:checked,
.dynamic-option-row input[type="checkbox"]:checked {
    border-color: var(--primary);
    background: var(--primary);
    position: relative;
}

.dynamic-option-row input[type="radio"]:checked::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.dynamic-option-row input[type="checkbox"]:checked::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: white;
    font-size: 12px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.btn-remove-option {
    background: transparent;
    border: none;
    color: var(--danger);
    cursor: pointer;
    opacity: 0.5;
    font-size: 1.1rem;
    transition: var(--transition-fast);
}

.btn-remove-option:hover {
    opacity: 1;
    transform: scale(1.1);
}

/* Matching UI */
.matching-columns-container {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}
@media (max-width: 768px) {
    .matching-columns-container {
        flex-direction: column;
    }
}
.matching-col {
    flex: 1;
    background: rgba(255,255,255,0.4);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}
.matching-col h5 {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}
.matching-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    background: white;
    padding: 0.4rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}
.matching-row input[type="text"] {
    flex: 1;
    border: none;
    border-bottom: 1px solid var(--border-color);
    padding: 0.2rem;
    background: transparent;
    color: var(--text-primary);
}
.matching-row select {
    width: 60px;
    padding: 0.2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

/* Sequence UI */
.sequence-container {
    margin-top: 1rem;
    background: rgba(255,255,255,0.4);
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}
.sequence-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    background: white;
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}
.sequence-row .seq-num {
    font-weight: bold;
    color: var(--primary);
    width: 24px;
    text-align: center;
}
.sequence-row input[type="text"] {
    flex: 1;
    border: none;
    border-bottom: 1px solid var(--border-color);
    padding: 0.2rem;
    background: transparent;
    color: var(--text-primary);
}

/* Question Image Upload */
.question-image-preview {
    margin: 10px 0;
    max-width: 100%;
    border-radius: var(--radius-md);
    position: relative;
    display: inline-block;
}

.question-image-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.btn-remove-image {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: all 0.2s;
}
.btn-remove-image:hover {
    transform: scale(1.1);
}

/* UI Toolbar for Question Types */
.type-selector-toolbar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    background: white;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
    width: fit-content;
}
.type-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid transparent;
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}
.type-btn:hover {
    background: var(--gray-100);
}
.type-btn.active {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary-light);
    font-weight: 600;
}

/* WYSIWYG Toolbar for Formatting & LaTeX */
.wysiwyg-toolbar {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.75rem;
    background: var(--gray-100);
    padding: 0.35rem;
    border-radius: var(--radius-sm);
    width: 100%;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}
.wysiwyg-btn {
    background: white;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: all 0.15s ease;
}
.wysiwyg-btn:hover {
    background: white;
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.rich-input {
    width: 100%;
    min-height: 2.5rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: white;
    font-size: 1rem;
    line-height: 1.5;
    outline: none;
    transition: border-color 0.2s;
    cursor: text;
}
.rich-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}
.rich-input:empty:before {
    content: attr(data-placeholder);
    color: #999;
    pointer-events: none;
    display: block;
}

/* Global LaTeX Modal */
.latex-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}
.latex-modal-overlay.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}
.latex-modal {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.latex-modal h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-family: var(--font-display);
}
.latex-modal input {
    width: 100%;
    margin-bottom: 1rem;
    font-family: monospace;
    font-size: 1.1rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.katex-inline {
    display: inline-block;
    padding: 0 0.3rem;
    cursor: default;
    background: rgba(67, 97, 238, 0.05);
    border-radius: 4px;
}

.question-run-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 10px 0 20px 0;
    display: block;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

/* ==========================================================================
   Test-taking elements
   ========================================================================== */
.test-run-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2rem;
}
.modal-body {
    max-height: 60vh;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* ==========================================================================
   Decor Line (Novatica style)
   ========================================================================== */
.novatica-decor-line {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 3rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
}

.novatica-decor-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.dot-1 { background: #ff006e; }
.dot-2 { background: #ffd166; }
.dot-3 { background: #06d6a0; }
.dot-4 { background: #118ab2; }
.dot-5 { background: #9d4edd; }

.question-run-card {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.question-run-text {
    font-size: 1.1em;
    margin-bottom: 1.25rem;
    font-weight: 600;
    line-height: 1.5;
    word-break: break-word;
}

.answers-run-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.answer-run-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    user-select: none;
    font-size: 1em;
    word-break: break-word;
}

.answer-run-option:hover {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--border-hover);
}

.answer-run-option input[type="radio"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    outline: none;
    position: relative;
    cursor: pointer;
    transition: var(--transition-fast);
}

.answer-run-option input[type="radio"]:checked {
    border-color: var(--primary);
    background: var(--primary);
}

.answer-run-option input[type="radio"]:checked::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.answer-run-option.selected {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.15);
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    background: rgba(13, 20, 38, 0.85);
    border: 1px solid var(--border-color);
    backdrop-filter: var(--blur-effect);
    -webkit-backdrop-filter: var(--blur-effect);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-premium);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 280px;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast.show {
    transform: translateX(0);
}

.toast-success { border-left: 4px solid var(--success); }
.toast-info { border-left: 4px solid var(--primary); }
.toast-warning { border-left: 4px solid var(--warning); }
.toast-danger { border-left: 4px solid var(--danger); }

.toast-icon-success { color: var(--success); }
.toast-icon-info { color: var(--primary); }
.toast-icon-warning { color: var(--warning); }
.toast-icon-danger { color: var(--danger); }

.toast-message {
    font-size: 0.9rem;
    font-weight: 500;
    color: white;
}

/* ==========================================================================
   Keyframe Animations
   ========================================================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.animate-up {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-scale {
    animation: scaleUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes scaleUp {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* KaTeX Inline Display and Scroll */
.katex-inline {
  display: inline-block;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  vertical-align: middle;
  white-space: nowrap;
}

/* ==========================================================================
   Student Test Run UI (One-by-One & Fullscreen)
   ========================================================================== */
.question-slide {
    display: none;
    animation: fadeIn 0.3s ease;
}

.question-slide.active {
    display: block;
}

body.ios-pseudo-fullscreen-active {
    overflow: hidden !important;
}

.pseudo-fullscreen {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100% !important;
    width: 100vw !important;
    height: 100% !important;
    height: -webkit-fill-available !important;
    height: 100dvh !important;
    max-width: none !important;
    max-height: none !important;
    margin: 0 !important;
    z-index: 99999 !important;
    background: var(--bg-light) !important;
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
    overscroll-behavior-y: contain;
    padding: 1.5rem 1.5rem max(5rem, calc(3.5rem + env(safe-area-inset-bottom, 1.5rem))) 1.5rem !important;
    box-sizing: border-box !important;
}

#fullscreen-floating-panel {
    transition: opacity 0.3s ease;
}

#fullscreen-floating-panel:hover {
    opacity: 1;
}

#guest-test-area:fullscreen,
#guest-test-area:-webkit-full-screen {
    background: var(--bg-light);
    padding: 2rem 2rem max(5rem, calc(3.5rem + env(safe-area-inset-bottom, 1.5rem))) 2rem;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}


#guest-test-area {
    max-width: 650px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
}

.test-run-container {
    
    padding-right: 0.5rem;
    margin-bottom: 2rem;
}

/* ==========================================================================
   Extracted Inline Styles (Student View)
   ========================================================================== */
.answer-run-text-input input {
    width: 100%;
    padding: 0.8rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.8);
}

.matching-run-grid {
    overflow-x: auto;
    margin-top: 1rem;
}
.matching-table {
    width: 100%;
    border-collapse: collapse;
    text-align: center;
}
.matching-th-item {
    padding: 0.5rem;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
}
.matching-th-num {
    padding: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}
.matching-td-left {
    padding: 0.8rem 0.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.matching-td-radio {
    padding: 0.8rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
}
.matching-radio-input {
    transform: scale(1.3);
    cursor: pointer;
}
.matching-options-panel {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(255,255,255,0.5);
    border-radius: var(--radius-sm);
}
.matching-options-title {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.matching-option-item {
    display: inline-block;
    margin-right: 1.5rem;
    margin-top: 0.5rem;
}

.sequence-run-list {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.sequence-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: white;
    padding: 0.8rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.sequence-select {
    padding: 0.4rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-weight: bold;
    width: 60px;
    text-align: center;
    cursor: pointer;
}
.sequence-text {
    flex: 1;
    font-size: 0.95rem;
}

.test-header-panel {
    margin-bottom: 2rem;
    border-style: hidden;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}
.test-header-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    text-align: center;
}
.test-header-meta {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.test-timer-display {
    background: rgba(255, 255, 255, 0.9);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    font-weight: bold;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

.floating-panel-container {
    position: fixed;
    top: max(1rem, env(safe-area-inset-top, 1rem));
    right: max(1rem, env(safe-area-inset-right, 1rem));
    z-index: 100000;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    background: rgba(255,255,255,0.95);
    padding: 0.4rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    flex-wrap: wrap;
    justify-content: flex-end;
    max-width: calc(100vw - 2rem);
    margin-top: 2px;
}

.zoom-controls-wrapper {
    display: flex;
    gap: 0.2rem;
    margin-right: 0.5rem;
    background: rgba(255,255,255,0.9);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    padding: 0.1rem;
}
.zoom-btn {
    padding: 0.3rem 0.6rem;
    font-weight: bold;
    transform: none !important;
}

.test-navigation-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    border-style: hidden;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
    padding-bottom: 1rem;
    gap: 0.5rem;
}
.test-navigation-footer .btn {
    touch-action: manipulation;
    white-space: nowrap;
}
.test-progress-text {
    font-weight: 500;
    color: var(--text-secondary);
}
.btn-finish-large {
    padding: 1rem;
    font-size: 1.05rem;
    touch-action: manipulation;
}

@media (max-width: 768px) {
    .main-content {
        width: 100%;
        margin: 0 auto;
    }
    #guest-test-area {
        padding: 1rem 2% max(5rem, calc(3.5rem + env(safe-area-inset-bottom, 1.5rem))) 2%;
        -webkit-overflow-scrolling: touch;
    }
    .pseudo-fullscreen {
        padding: 1rem 2% max(6rem, calc(4.5rem + env(safe-area-inset-bottom, 2rem))) 2% !important;
        -webkit-overflow-scrolling: touch !important;
    }
    #guest-test-area:fullscreen,
    #guest-test-area:-webkit-full-screen {
        padding: 1rem 2% max(5rem, calc(3.5rem + env(safe-area-inset-bottom, 1.5rem))) 2% !important;
        -webkit-overflow-scrolling: touch !important;
    }
    .question-run-card {
        padding: 1rem 3%;
    }
    .answer-run-option {
        padding: 0.8rem 3%;
    }
    .test-run-container {
        padding-right: 0;
        margin-bottom: 1rem;
    }
    .test-navigation-footer {
        margin-top: 1.25rem;
        padding-top: 1rem;
        padding-bottom: 2rem;
        gap: 0.5rem;
    }

    .floating-panel-container {
    position: static;
    top: max(1rem, env(safe-area-inset-top, 1rem));
    right: max(1rem, env(safe-area-inset-right, 1rem));
    z-index: 100000;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    background: rgba(255,255,255,0.95);
    padding: 0.4rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    flex-wrap: wrap;
    justify-content: flex-end;
    max-width: calc(100vw - 2rem);
    min-width: 300px;
    width: 75%;
    margin: 0 auto;
}
}