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

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

/* Navbar Styles */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
}

.logo i {
    margin-right: 10px;
}

.nav-links a {
    margin-left: 2rem;
    text-decoration: none;
    color: #333;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: #667eea;
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 100px auto 0;
    padding: 4rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: white;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.highlight {
    color: #ffd700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.hero-buttons .btn {
    display: inline-block;
    padding: 12px 30px;
    margin-right: 1rem;
    text-decoration: none;
    border-radius: 5px;
    transition: transform 0.3s;
}

.btn-primary {
    background: #ffd700;
    color: #333;
}

.btn-secondary {
    background: transparent;
    border: 2px solid white;
    color: white;
}

.btn-primary:hover,
.btn-secondary:hover {
    transform: translateY(-2px);
}

.hero-image i {
    font-size: 200px;
    color: rgba(255, 255, 255, 0.3);
}

/* Features Section */
.features {
    background: white;
    padding: 4rem 2rem;
    text-align: center;
}

.features h2 {
    margin-bottom: 3rem;
    color: #333;
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #333;
}

/* Auth Forms */
.auth-container {
    max-width: 500px;
    margin: 100px auto;
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.1);
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #667eea;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.auth-btn {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.auth-btn:hover {
    background: #5a67d8;
}

.auth-link {
    text-align: center;
    margin-top: 1rem;
}

.auth-link a {
    color: #667eea;
    text-decoration: none;
}

/* Dashboard */
.dashboard-container {
    max-width: 1200px;
    margin: 80px auto 0;
    padding: 2rem;
}

.dashboard-header {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.welcome-text {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.dashboard-card {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.dashboard-card h3 {
    margin-bottom: 1rem;
    color: #667eea;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 0.5rem;
}

/* Course Cards */
.course-card {
    background: #f9f9f9;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: transform 0.3s;
}

.course-card:hover {
    transform: translateX(5px);
    background: #f0f0f0;
}

/* Alert Messages */
.alert {
    padding: 12px;
    border-radius: 5px;
    margin-bottom: 1rem;
    display: none;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* Profile Section */
.profile-info {
    display: grid;
    gap: 1rem;
}

.profile-field {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

.profile-field strong {
    color: #666;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-image i {
        font-size: 150px;
        margin-top: 2rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links a {
        margin: 0 1rem;
    }
}

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background: white;
    margin: 50px auto;
    padding: 2rem;
    border-radius: 10px;
    max-width: 500px;
    position: relative;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: #999;
}

.close:hover {
    color: #333;
}