* {
    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: #1a1a1a;
    background: #ffffff;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    border-bottom: 1px solid #e5e5e5;
    padding: 24px 0;
}

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

.logo {
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    color: #1a1a1a;
}

nav a {
    color: #0066cc;
    text-decoration: none;
    margin-left: 24px;
    font-size: 14px;
}

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

main {
    padding: 48px 0;
}

h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 8px;
}

.update-date {
    font-size: 14px;
    color: #666;
    margin-bottom: 32px;
}

h2 {
    font-size: 20px;
    font-weight: 600;
    margin-top: 48px;
    margin-bottom: 16px;
}

h3 {
    font-size: 16px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 12px;
}

p {
    margin-bottom: 16px;
}

ul,
ol {
    margin-left: 24px;
    margin-bottom: 16px;
}

li {
    margin-bottom: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
}

th,
td {
    padding: 12px;
    text-align: left;
    border: 1px solid #e5e5e5;
}

th {
    background: #f9f9f9;
    font-weight: 600;
}

main a {
    color: #0066cc;
    text-decoration: none;
}

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

.subtitle {
    font-size: 18px;
    color: #666;
    margin-bottom: 48px;
}

.contact-info {
    background: #f9f9f9;
    padding: 24px;
    border-radius: 8px;
    margin: 32px 0;
}

.toc {
    border: 1px solid #e5e5e5;
    background: #f9f9f9;
    border-radius: 8px;
    padding: 16px 20px;
    margin-bottom: 32px;
}

.toc-title {
    font-size: 14px;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.toc ul {
    margin-left: 20px;
    margin-bottom: 0;
}

@media (min-width: 1100px) {
    .toc {
        position: fixed;
        right: 32px;
        top: 140px;
        width: 280px;
        max-height: calc(100vh - 200px);
        margin-bottom: 0;
        overflow: auto;
    }
}

footer {
    border-top: 1px solid #e5e5e5;
    padding: 24px 0;
    margin-top: 60px;
    font-size: 14px;
    color: #666;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-links a {
    color: #0066cc;
    text-decoration: none;
    margin-right: 16px;
}

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

@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    nav a {
        margin-left: 0;
        margin-right: 16px;
    }

    h1 {
        font-size: 28px;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }

    table {
        font-size: 14px;
    }

    th,
    td {
        padding: 8px;
    }
}