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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.8;
}

/* Hero Section */
.hero {
    background: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #4a5568;
    max-width: 700px;
    margin: 0 auto 2rem;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

/* Main Content */
main {
    padding: 4rem 0;
}

.content-section {
    background: white;
    padding: 3rem;
    margin-bottom: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.content-section h2 {
    color: #2d3748;
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.content-section h3 {
    color: #4a5568;
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
}

.content-section p {
    color: #4a5568;
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.content-section ul, .content-section ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
    color: #4a5568;
}

.content-section li {
    margin-bottom: 0.5rem;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.feature-card h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #4a5568;
}

/* Example Box */
.example-box {
    background: #f7fafc;
    border-left: 4px solid #667eea;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 5px;
}

.example-box h4 {
    color: #2d3748;
    margin-bottom: 0.5rem;
}

/* Internal Links */
.internal-links {
    background: #edf2f7;
    padding: 2rem;
    border-radius: 10px;
    margin: 2rem 0;
}

.internal-links h3 {
    color: #2d3748;
    margin-bottom: 1rem;
}

.internal-links ul {
    list-style: none;
    margin-left: 0;
}

.internal-links li {
    margin-bottom: 0.5rem;
}

.internal-links a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.internal-links a:hover {
    color: #764ba2;
}

/* Footer */
footer {
    background: #2d3748;
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: #667eea;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #4a5568;
    color: #a0aec0;
}

.copyright a {
    color: #90cdf4;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.copyright a:hover {
    color: #63b3ed;
    text-decoration: underline;
}

/* 404 Page Specific */
.error-page {
    text-align: center;
    padding: 6rem 0;
}

.error-page h1 {
    font-size: 6rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.error-page h2 {
    font-size: 2rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .content-section {
        padding: 1.5rem;
    }

    .content-section h2 {
        font-size: 1.5rem;
    }

    .content-section h3 {
        font-size: 1.2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .cta-button {
        padding: 0.8rem 2rem;
        font-size: 0.9rem;
    }

    .content-section {
        padding: 1rem;
    }

    .error-page h1 {
        font-size: 4rem;
    }

    .error-page h2 {
        font-size: 1.5rem;
    }
}