*{box-sizing:border-box}
:root{--bg:#f5f3ec;--card:#ffffff;--text:#22303a;--muted:#5e6c78;--border:#d9d4c6;--accent:#1d5f7e;--midbg:#eee9dd}
@media(prefers-color-scheme:dark){:root{--bg:#0f171d;--card:#19242d;--text:#e7e3d6;--muted:#98a6b0;--border:#2d3a44;--accent:#6fb3d2;--midbg:#222d36}}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;font-size:16px}
.nav{max-width:760px;margin:0 auto;padding:18px 16px 6px;display:flex;flex-wrap:wrap;gap:6px 16px;align-items:baseline}
.nav .brand{font-weight:600;font-size:17px;color:var(--text);text-decoration:none;margin-right:6px}
.nav a{color:var(--muted);text-decoration:none;font-size:14px}
.nav a:hover{color:var(--accent)}
.nav a.on{color:var(--accent);font-weight:600}
main{max-width:760px;margin:0 auto;padding:8px 16px 40px}
h1{font-size:28px;line-height:1.25;margin:18px 0 6px}
h2{font-size:21px;margin:28px 0 8px}
h3{font-size:17px;margin:22px 0 6px}
a{color:var(--accent)}
.lead{font-size:18px;color:var(--muted);margin-top:0}
.callout{background:var(--midbg);border-radius:12px;padding:12px 16px;margin:16px 0}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin:14px 0}
table{border-collapse:collapse;width:100%;margin:14px 0;font-size:15px}
th,td{border:1px solid var(--border);padding:8px 10px;text-align:left;vertical-align:top}
th{background:var(--midbg)}
dt{font-weight:600;margin-top:10px}
dd{margin:2px 0 0 0;color:var(--muted)}
footer{max-width:760px;margin:0 auto;padding:0 16px 40px;color:var(--muted);font-size:13px}
footer a{color:var(--muted)}
.btn{display:inline-block;background:var(--accent);color:#ffffff !important;text-decoration:none;border-radius:10px;padding:10px 16px;font-size:15px;margin:6px 0}
.adslot{margin:22px 0}
@media(max-width:520px){h1{font-size:23px}}