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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
    background: #fafafa;
    color: #1a1a1a;
    line-height: 1.7;
    padding: 40px 20px;
}

.container {
    max-width: 640px;
    margin: 0 auto;
}

header {
    margin-bottom: 40px;
}

.back {
    display: inline-block;
    font-size: 0.85rem;
    color: #666;
    text-decoration: none;
    margin-bottom: 20px;
}

.back:hover {
    color: #1a1a1a;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 30px 0 15px;
}

h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 25px 0 10px;
}

p {
    font-size: 0.95rem;
    color: #333;
    margin-bottom: 12px;
}

ul, ol {
    margin-left: 20px;
    margin-bottom: 15px;
    font-size: 0.95rem;
    color: #333;
}

li {
    margin-bottom: 6px;
}

pre {
    background: #f5f5f5;
    padding: 12px 14px;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.85rem;
    margin: 15px 0;
    line-height: 1.5;
}

code {
    background: #f0f0f0;
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 0.9em;
}

.note {
    font-size: 0.85rem;
    color: #888;
    padding: 12px 14px;
    background: #f5f5f5;
    border-radius: 6px;
    margin: 15px 0;
}

a {
    color: #1a1a1a;
    text-decoration: none;
    border-bottom: 1px solid #ddd;
}

a:hover {
    border-bottom-color: #1a1a1a;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

th, td {
    text-align: left;
    padding: 8px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid #f5f5f5;
}

th {
    font-weight: 600;
    color: #1a1a1a;
}

@media (max-width: 480px) {
    body { padding: 30px 16px; }
    h1 { font-size: 1.3rem; }
}