:root {
    --color-bg: #fafaf8;
    --color-ink: #1a1a1a;
    --color-soft: #444;
    --color-muted: #777;
    --color-line: #e6e6e0;
    --color-accent: #1f3a2e;
    --color-accent-soft: #e8efe9;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, serif;
    --font-mono: "SF Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font-serif);
    color: var(--color-ink);
    background: var(--color-bg);
    line-height: 1.85;
    font-size: 16.5px;
    -webkit-font-smoothing: antialiased;
}
.doc-nav {
    background: #fff;
    border-bottom: 1px solid var(--color-line);
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(8px);
}
.doc-nav .nav-inner {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 28px;
    font-family: var(--font-sans);
    font-size: 14px;
    color: var(--color-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}
.doc-nav a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}
.doc-nav a:hover { border-bottom-color: var(--color-accent); }
.doc-nav .nav-title { font-weight: 600; color: var(--color-ink); }
.doc-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 32px 28px 80px;
}
.doc-container h1 {
    font-size: 30px;
    font-weight: 700;
    color: var(--color-accent);
    margin: 0 0 8px;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 12px;
    line-height: 1.35;
}
.doc-container h2 {
    font-size: 22px;
    color: var(--color-accent);
    margin: 38px 0 14px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--color-line);
}
.doc-container h3 {
    font-size: 17px;
    color: var(--color-ink);
    margin: 28px 0 10px;
    font-weight: 600;
}
.doc-container h4 {
    font-size: 15.5px;
    color: var(--color-soft);
    margin: 22px 0 8px;
    font-weight: 600;
}
.doc-container p { margin: 0 0 14px; text-align: justify; }
.doc-container ul, .doc-container ol { margin: 10px 0 16px; padding-left: 28px; }
.doc-container li { margin: 6px 0; }
.doc-container strong { color: var(--color-accent); }
.doc-container em { color: var(--color-soft); }
.doc-container a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid var(--color-accent-soft);
}
.doc-container a:hover { border-bottom-color: var(--color-accent); }
.doc-container hr {
    border: 0;
    border-top: 1px solid var(--color-line);
    margin: 32px 0;
}
.doc-container blockquote {
    border-left: 3px solid var(--color-accent);
    background: var(--color-accent-soft);
    margin: 16px 0;
    padding: 12px 18px;
    color: var(--color-soft);
    border-radius: 0 4px 4px 0;
}
.doc-container blockquote p { margin: 0; }
.doc-container code {
    font-family: var(--font-mono);
    background: #f0f0eb;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.9em;
}
.doc-container pre {
    background: #f5f5f0;
    border: 1px solid var(--color-line);
    padding: 14px 16px;
    border-radius: 4px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.6;
    font-family: var(--font-mono);
}
.doc-container pre code {
    background: transparent;
    padding: 0;
    font-size: inherit;
}
.doc-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14.5px;
    font-family: var(--font-sans);
}
.doc-container th, .doc-container td {
    border: 1px solid var(--color-line);
    padding: 8px 12px;
    text-align: left;
    vertical-align: top;
}
.doc-container th {
    background: #f0f0eb;
    font-weight: 600;
}
.doc-container tr:nth-child(even) td {
    background: #fbfbf7;
}
.privacy-banner {
    background: #fff8e6;
    border: 1px solid #e8d5a0;
    border-radius: 6px;
    padding: 12px 18px;
    margin: 0 0 24px;
    font-family: var(--font-sans);
    font-size: 13.5px;
    color: #6b5a2b;
    line-height: 1.6;
}
@media (max-width: 700px) {
    .doc-container { padding: 22px 18px 60px; }
    .doc-container h1 { font-size: 24px; }
    .doc-container h2 { font-size: 19px; }
    body { font-size: 15.5px; }
}