:root {
    --primary-color: #00f7ff;
    --secondary-color: #00a8ff;
    --background-dark: #0a192f;
    --background-darker: #020c1b;
    --text-light: #e6f1ff;
    --text-muted: #8892b0;
    --card-bg: #112240;
    --success: #64ffda;
    --danger: #ff5555;
    --border-radius: 8px;
    --box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    background-color: var(--background-dark);
    color: var(--text-light);
    min-height: 100vh;
    transition: var(--transition);
    position: relative;
    overflow-x: hidden;
}

/* Animated Tech Background */
#tech-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--text-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.option-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    color: var(--text-light);
    transition: var(--transition);
    border: 1px solid rgba(100, 255, 218, 0.1);
}

.option-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
    border-color: var(--primary-color);
}

.option-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.option-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.leaderboard {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-top: 2rem;
    border: 1px solid rgba(100, 255, 218, 0.1);
}

.leaderboard h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.tab-button {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    position: relative;
    transition: var(--transition);
}

.tab-button:hover {
    color: var(--primary-color);
}

.tab-button.active {
    color: var(--primary-color);
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
}

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

.leaderboard-table th,
.leaderboard-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.leaderboard-table th {
    color: var(--primary-color);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.leaderboard-table tr:last-child td {
    border-bottom: none;
}

.rank {
    font-weight: bold;
    color: var(--primary-color);
    font-family: 'Orbitron', sans-serif;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .leaderboard {
        padding: 1rem;
    }
    
    .leaderboard-table th,
    .leaderboard-table td {
        padding: 0.5rem 0.25rem;
        font-size: 0.9rem;
    }
}

/* Form Styles (for login/register pages) */
.form-container {
    max-width: 500px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--border-radius);
    color: var(--text-light);
    font-family: 'Roboto', sans-serif;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 247, 255, 0.2);
}

.btn {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: var(--background-dark);
    border: none;
    padding: 0.75rem 2rem;
    border-radius: var(--border-radius);
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 247, 255, 0.3);
}

.btn-block {
    display: block;
    width: 100%;
}

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

.mt-3 {
    margin-top: 1.5rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

/* Quiz Styles */
.quiz-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.quiz-header {
    margin-bottom: 2rem;
    text-align: center;
}

.quiz-header h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.quiz-progress {
    height: 5px;
    background: rgba(100, 255, 218, 0.1);
    border-radius: 5px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

.question-container {
    margin-bottom: 2rem;
}

.question-text {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.options-container {
    display: grid;
    gap: 1rem;
}

.option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.option:hover {
    background: rgba(100, 255, 218, 0.1);
    border-color: var(--primary-color);
}

.option.selected {
    background: rgba(0, 247, 255, 0.2);
    border-color: var(--primary-color);
}

.option.correct {
    background: rgba(100, 255, 138, 0.2);
    border-color: #64ff8a;
}

.option.incorrect {
    background: rgba(255, 100, 100, 0.2);
    border-color: #ff6464;
}

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

/* Admin Dashboard */
.admin-dashboard {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 2rem;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.admin-actions {
    display: flex;
    gap: 1rem;
}

.table-responsive {
    overflow-x: auto;
    margin-bottom: 2rem;
}

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

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

th {
    background: rgba(100, 255, 218, 0.05);
    color: var(--primary-color);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

tr:hover {
    background: rgba(100, 255, 218, 0.05);
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.btn-edit {
    background: linear-gradient(90deg, #00b4d8, #0096c7);
}

.btn-delete {
    background: linear-gradient(90deg, #ff6b6b, #ff4d4d);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--primary-color);
}

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

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

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

.text-success {
    color: var(--success);
}

.text-danger {
    color: var(--danger);
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 247, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin: 2rem auto;
}

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

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    color: white;
    z-index: 1000;
    transform: translateX(120%);
    transition: transform 0.3s ease;
    max-width: 300px;
}

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

.notification.success {
    background: #28a745;
}

.notification.error {
    background: #dc3545;
}

.notification.warning {
    background: #ffc107;
    color: #212529;
}

/* Footer Styles */
.footer {
    margin-top: 4rem;
    padding: 2rem 0 1rem 0;
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    text-align: center;
}

.footer p {
    margin: 0.5rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.footer .company-name {
    color: var(--primary-color);
    font-weight: 500;
}

@media (max-width: 768px) {
    .footer {
        margin-top: 2rem;
        padding: 1rem 0;
    }
    
    .footer p {
        font-size: 0.85rem;
    }
}