* {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Custom Variables */
:root {
    --primary-gradient: linear-gradient(135deg, #007bff 0%, #17a2b8 100%);
    --secondary-gradient: linear-gradient(135deg, #20c997 0%, #28a745 100%);
    --success-gradient: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    --info-gradient: linear-gradient(135deg, #17a2b8 0%, #007bff 100%);
    --warning-gradient: linear-gradient(135deg, #ffc107 0%, #fd7e14 100%);
    --danger-gradient: linear-gradient(135deg, #dc3545 0%, #e83e8c 100%);
    --light-bg: #f8f9fa;
    --light-text: #212529;
    --light-border: rgba(0, 0, 0, 0.1);
}

/* Light Mode (Default) */
[data-bs-theme="light"] {
    --bs-body-bg: var(--light-bg);
    --bs-body-color: var(--light-text);
}

/* Sticky Navbar */
.navbar-sticky {
    position: sticky;
    top: 0;
    z-index: 1030;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar-sticky.scrolled {
    background: rgba(0, 123, 255, 0.95) !important;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

/* Hero Section */
.hero-section {
    background: var(--primary-gradient);
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="60" cy="80" r="1.5" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.5;
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

.stats h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: white !important;
}

.stats p {
    color: rgba(255, 255, 255, 0.9) !important;
}

/* Features Section */
.features-section {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

.features-section .display-5 {
    color: var(--bs-body-color);
}

.features-section .lead {
    color: var(--bs-body-color);
    opacity: 0.8;
}

/* Feature Cards */
.feature-card {
    transition: all 0.3s ease;
    border-radius: 15px;
    background-color: var(--bs-body-bg);
    border: 1px solid var(--light-border);
    color: var(--bs-body-color);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.feature-card .card-title {
    color: var(--bs-body-color);
}

.feature-card .card-text {
    color: var(--bs-body-color);
    opacity: 0.8;
}

.feature-icon {
    transition: transform 0.3s ease;
    color: var(--bs-body-color);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

/* CTA Section */
.cta-section {
    background: var(--secondary-gradient);
    color: white;
}

/* Newsletter Section */
.newsletter-section {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

/* Dropdown Menus */
.dropdown-menu {
    background-color: var(--bs-body-bg);
    border: 1px solid var(--light-border);
}

.dropdown-item {
    color: var(--bs-body-color);
}

.dropdown-item:hover {
    background-color: var(--light-bg);
    color: var(--bs-body-color);
}

/* Tooltips */
.tooltip-inner {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    border: 1px solid var(--light-border);
}

.bs-tooltip-auto[data-popper-placement^=top] .tooltip-arrow::before,
.bs-tooltip-top .tooltip-arrow::before {
    border-top-color: var(--light-border);
}

.newsletter-section h3,
.newsletter-section p {
    color: var(--bs-body-color);
}

/* Footer */
footer {
    background-color: #212529;
    color: #ffffff;
}

footer .nav-link {
    color: rgba(255, 255, 255, 0.7);
}

footer .nav-link:hover {
    color: #ffffff;
}

footer h5,
footer h6 {
    color: #ffffff;
}

footer p {
    color: rgba(255, 255, 255, 0.8);
}

footer .text-muted {
    color: rgba(255, 255, 255, 0.6) !important;
}

footer hr {
    border-color: rgba(255, 255, 255, 0.1);
}

/* Form Elements */
.form-control {
    background-color: var(--bs-body-bg);
    border: 1px solid var(--light-border);
    color: var(--bs-body-color);
}

[data-bs-theme="dark"] .form-control {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--dark-border);
    color: var(--bs-body-color);
}

.form-control:focus {
    background-color: var(--bs-body-bg);
    border-color: #667eea;
    color: var(--bs-body-color);
}

[data-bs-theme="dark"] .form-control:focus {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Buttons */
.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.btn-outline-primary {
    color: #007bff;
    border-color: #007bff;
}

.btn-outline-primary:hover {
    background-color: #007bff;
    border-color: #007bff;
}

.btn-outline-light {
    color: #ffffff;
    border-color: #ffffff;
}

.btn-outline-light:hover {
    background-color: #ffffff;
    color: #667eea;
}

.btn-light {
    background-color: #ffffff;
    color: #667eea;
    border-color: #ffffff;
}

.btn-light:hover {
    background-color: rgba(255, 255, 255, 0.9);
    color: #5a67d8;
}

/* Links */
a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    color: #0056b3;
}

/* Icons */
.bi {
    color: var(--bs-body-color);
}

/* Shadows and Effects */

/* Focus styles */
.btn:focus,
.form-control:focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Newsletter Form */
.newsletter-form input:focus,
.newsletter-form-footer input:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-section {
        text-align: center;
        padding: 3rem 0;
    }

    .stats .col-4 {
        margin-bottom: 2rem;
    }

    .feature-card {
        margin-bottom: 2rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading Animation */
.loading {
    opacity: 0;
    animation: fadeIn 0.5s ease-out 0.5s forwards;
}

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

/* Quiz Page Styles */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.question-card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.question-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.question-header {
    background: var(--primary-gradient);
    color: white;
    border-radius: 15px 15px 0 0;
    padding: 1rem;
}

.option-label {
    display: block;
    padding: 1rem;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.option-label:hover {
    border-color: #007bff;
    background-color: rgba(0, 123, 255, 0.05);
}

.option-input:checked + .option-label {
    border-color: #007bff;
    background-color: rgba(0, 123, 255, 0.1);
}

.progress-bar {
    background: var(--primary-gradient);
    border-radius: 10px;
}

.timer-display {
    background: var(--warning-gradient);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: bold;
}

/* Leaderboard Styles */
.leaderboard-table {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.rank-badge {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
}

.rank-1 { background: linear-gradient(135deg, #ffd700, #ffb347); }
.rank-2 { background: linear-gradient(135deg, #c0c0c0, #a8a8a8); }
.rank-3 { background: linear-gradient(135deg, #cd7f32, #a0522d); }

/* Dashboard Styles */
.stats-card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.stats-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.stats-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

/* Auth Pages */
.auth-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

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

.auth-header h1 {
    color: #007bff;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: #6c757d;
}

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

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.animate-slide-up {
    animation: slideUp 0.6s ease-out 0.2s both;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.animate-bounce {
    animation: bounce 2s infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

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

.animate-pulse {
    animation: pulse 2s infinite;
}