* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    margin: 0;
    background: #f5f6f8;
    color: #333;
    line-height: 1.7;
}

a {
    color: #0a58ca;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.header {
    background: #111827;
    color: #fff;
    padding: 40px 20px;
    text-align: center;
}

.header h1 {
    margin: 0;
    font-size: 32px;
}

.header p {
    margin: 8px 0;
}

.updated {
    font-size: 14px;
    opacity: 0.8;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.box {
    background: #fff;
    padding: 25px;
    margin-bottom: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.box h2 {
    margin-top: 0;
    color: #111827;
}

.toc {
    padding-left: 20px;
}

.toc li {
    margin-bottom: 8px;
}

ul {
    padding-left: 20px;
}

.note {
    background: #fef3c7;
    padding: 12px;
    border-left: 4px solid #f59e0b;
    font-size: 14px;
}

.footer {
    background: #111827;
    color: #d1d5db;
    text-align: center;
    padding: 20px;
    font-size: 14px;
}