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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

section {
    padding: 2rem;
    border-bottom: 1px solid #eee;
}

section:last-of-type {
    border-bottom: none;
}

h2 {
    color: #667eea;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

h3 {
    color: #764ba2;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.intro p {
    font-size: 1.1rem;
    color: #555;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.feature-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.2);
}

.feature-card ul {
    list-style: none;
    margin-top: 0.5rem;
}

.feature-card li {
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.feature-card li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.code-block {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    border-left: 4px solid #764ba2;
}

.code-block h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

pre {
    background: #2d3748;
    color: #e2e8f0;
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-top: 0.5rem;
}

code {
    font-family: "Courier New", Courier, monospace;
    font-size: 0.95rem;
}

.usage p {
    margin: 1rem 0;
    font-size: 1.05rem;
}

.api-section {
    margin: 1.5rem 0;
}

.api-section ul {
    list-style: none;
    margin-left: 1rem;
}

.api-section li {
    padding: 0.5rem 0;
    font-family: monospace;
    font-size: 0.95rem;
}

.api-section code {
    background: #f1f3f5;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: #667eea;
    font-weight: 600;
}

.storage ul {
    list-style: none;
    margin-left: 1rem;
}

.storage li {
    padding: 0.5rem 0;
    font-size: 1.05rem;
}

.storage code {
    background: #f1f3f5;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: #764ba2;
    font-family: monospace;
}

footer {
    background: #f8f9fa;
    text-align: center;
    padding: 2rem;
    color: #666;
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

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

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    h2 {
        font-size: 1.5rem;
    }

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

    section {
        padding: 1.5rem;
    }
}