:root{--sky:#0099FF;--ink:#06203D;--muted:#4A6382;--line:#D8E7F7;--soft:#EAF5FF}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text",system-ui,sans-serif;color:var(--ink);background:#FDFDFE;font-size:16.5px;line-height:1.65;-webkit-font-smoothing:antialiased}
header{border-bottom:1px solid var(--line);background:rgba(253,253,254,.9);position:sticky;top:0;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
header div{max-width:820px;margin:0 auto;padding:0 20px;height:62px;display:flex;align-items:center;gap:10px}
header a{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink);text-decoration:none}
header img{width:30px;height:30px}
main{max-width:820px;margin:0 auto;padding:48px 20px 80px}
h1{font-size:clamp(34px,6vw,52px);font-weight:900;letter-spacing:-.04em;line-height:1;margin:0 0 10px}
.date{color:var(--muted);font-size:14px;margin:0 0 30px}
nav.toc{background:var(--soft);border-radius:18px;padding:18px 22px;margin:0 0 40px;font-size:15px}
nav.toc a{color:var(--ink)}
h2{font-size:22px;font-weight:800;letter-spacing:-.015em;margin:42px 0 10px;scroll-margin-top:80px}
ol,ul{padding-left:22px}li{margin:6px 0}
a{color:#0080E6}
.box{border:1px solid var(--line);border-radius:16px;padding:16px 20px;margin:18px 0}
table{border-collapse:collapse;width:100%;font-size:15px;margin:14px 0}
th,td{border-bottom:1px solid var(--line);text-align:left;padding:10px 8px;vertical-align:top}
th{font-weight:700}
.ph{background:#FFF4D6;border-radius:4px;padding:0 4px}
footer{max-width:820px;margin:0 auto;padding:0 20px 50px;color:var(--muted);font-size:14px;display:flex;gap:20px;flex-wrap:wrap}
footer a{color:var(--muted)}
@media (max-width:600px){table{font-size:14px}th,td{padding:8px 4px}}