body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
}

.navbar {
    background: #2c3e50;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    margin: 0;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
}

.nav-links a:hover {
    text-decoration: underline;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 4rem 1rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

.cta-button {
    background: #e67e22;
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-size: 1rem;
}

.cta-button:hover {
    background: #d35400;
}

.courses {
    padding: 2rem;
    text-align: center;
}

.courses h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.course-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

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

.course-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.course-card p {
    font-size: 1rem;
    color: #666;
    margin-bottom: 1rem;
}

.course-link {
    color: #667eea;
    text-decoration: none;
    font-weight: bold;
}

.course-link:hover {
    text-decoration: underline;
}

.about {
    background: #f9f9f9;
    padding: 2rem;
    text-align: center;
}

.about h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem;
}

footer a {
    color: #667eea;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.login-container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    margin: 2rem auto;
}

.login-form h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #666;
}

.input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s;
}

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

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-container input {
    margin-right: 0.5rem;
    width: auto;
}

.checkmark {
    height: 20px;
    width: 20px;
    background-color: #eee;
    border-radius: 3px;
    margin-right: 0.5rem;
    position: relative;
}

.checkbox-container input:checked ~ .checkmark {
    background-color: #667eea;
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

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

.forgot-link:hover {
    text-decoration: underline;
}

.login-btn {
    width: 100%;
    padding: 0.75rem;
    background: #e67e22;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: opacity 0.3s;
}

.login-btn:hover {
    opacity: 0.9;
}

.signup-link {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
}

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

.signup-link a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 1rem;
    }
}