:root {
    --bg: #f7f8fb;
    --paper: #ffffff;
    --text: #172033;
    --muted: #667085;
    --line: #d9e0ea;
    --brand: #1d4ed8;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.72;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.page {
    max-width: 820px;
    margin: 0 auto;
    padding: 42px 20px 70px;
}
.back {
    display: inline-block;
    margin-bottom: 24px;
    color: var(--muted);
}
h1 {
    margin: 0 0 10px;
    font-size: clamp(30px, 5vw, 44px);
    line-height: 1.14;
    color: #0f172a;
}
h2 {
    margin: 30px 0 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--line);
    color: #0f172a;
    font-size: 22px;
}
p, li, dd { color: #475467; }
.updated { color: var(--muted); }
.mail {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
    font-size: 20px;
    font-weight: 700;
}
.contact-list {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}
.contact-list div {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
}
dt {
    color: #0f172a;
    font-weight: 800;
}
dd {
    margin: 6px 0 0;
}