:root {
    --brand: #5B57E0;
    --text: #1F2430;
    --muted: #6B7280;
    --border: #E6E8EC;
    --bg: #FFFFFF;
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    margin: 0;
    line-height: 1.62;
}

.container { max-width: 760px; margin: 0 auto; padding: 32px 20px 64px; }

header.doc { border-bottom: 2px solid var(--brand); padding-bottom: 16px; margin-bottom: 4px; }
.brand { color: var(--brand); font-size: 24px; font-weight: 700; margin: 0; }
header.doc h1 { font-size: 22px; margin: 14px 0 4px; }
.updated { color: var(--muted); font-size: 13px; margin: 0; }

.langnav { margin: 18px 0 4px; font-size: 14px; }
.langnav a { color: var(--brand); text-decoration: none; font-weight: 600; }
.langnav a:hover { text-decoration: underline; }

h2 { font-size: 18px; margin-top: 32px; }
h3 { font-size: 15px; margin-top: 22px; }
p, li { font-size: 15px; }
ul { padding-left: 22px; }
a { color: var(--brand); }
strong { font-weight: 600; }

hr.sep { border: none; border-top: 1px solid var(--border); margin: 44px 0; }

.backlink { display: inline-block; margin-top: 24px; font-size: 14px; }

footer.doc { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }

.card-list { list-style: none; padding: 0; margin-top: 24px; }
.card-list li { margin: 12px 0; }
.card-list a {
    display: block;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
}
.card-list a:hover { border-color: var(--brand); }
.card-list small { display: block; color: var(--muted); font-weight: 400; margin-top: 4px; }