:root {
    --primary-color: #6c5ce7;
    --secondary-color: #a8a4e6;
    --success-color: #00b894;
    --danger-color: #d63031;
    --warning-color: #fdcb6e;
    --dark-color: #2d3436;
    --light-color: #f5f6fa;
}

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

body {
    font-family: 'Poppins', sans-serif;
    color: var(--dark-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Navbar Styling */
.navbar {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95) !important;
}

.navbar-brand {
    font-size: 1.5rem;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 120px 0;
    color: white;
    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 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
}

/* Cards */
.course-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    height: 100%;
    position: relative;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(108, 92, 231, 0.2);
}

.course-card .card-img-top {
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.course-card:hover .card-img-top {
    transform: scale(1.05);
}

.course-card .card-body {
    padding: 1.5rem;
}

.course-card .card-title {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.course-card .card-text {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.6;
}

.course-card .price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.course-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    z-index: 1;
}

.badge-beginner { background: var(--success-color); color: white; }
.badge-intermediate { background: var(--warning-color); color: var(--dark-color); }
.badge-advanced { background: var(--danger-color); color: white; }

/* Dashboard */
.dashboard-stats {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
    border-radius: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: scale(1.05);
}

.stat-card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.stat-card h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

/* Forms */
.auth-form {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 450px;
    margin: 2rem auto;
}

.auth-form h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--dark-color);
    font-weight: 600;
}

.form-control {
    border-radius: 10px;
    padding: 0.75rem 1rem;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(108, 92, 231, 0.25);
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 10px;
    padding: 0.75rem 2rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(108, 92, 231, 0.3);
}

/* Animations */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 80px 0;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .auth-form {
        padding: 2rem;
        margin: 1rem;
    }
    
    .stat-card {
        margin-bottom: 1rem;
    }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    min-width: 250px;
    padding: 1rem;
    border-radius: 10px;
    background: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}