":root{--bg:#fff;--fg:#14161a;--muted:#5b6472;--line:#e3e6ea;--accent:#0b6b3a;--chip:#f2f5f3}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}
header{border-bottom:1px solid var(--line);padding:14px 18px}
header a{color:var(--fg);font-weight:700;text-decoration:none}
main{max-width:760px;margin:0 auto;padding:20px 18px 48px}
h1{font-size:1.6rem;line-height:1.25;margin:.4em 0 .5em}
h2{font-size:1.12rem;margin:1.6em 0 .4em}
h3{font-size:1rem;margin:1.2em 0 .2em}
a{color:#0b57d0}
table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.95rem}
th,td{border-bottom:1px solid var(--line);padding:7px 6px;text-align:left}
.meta{color:var(--muted);font-size:.88rem}
.ans{font-weight:700;letter-spacing:.06em}
code{background:var(--chip);padding:1px 5px;border-radius:4px;font-size:.95em}
details{border:1px solid var(--line);border-radius:8px;padding:8px 12px;margin:8px 0;background:#fafbfa}
summary{cursor:pointer;font-weight:600}
section.h{border-top:1px solid var(--line);padding-top:6px}
ul{padding-left:1.1em}
.disclaimer{color:var(--muted);font-size:.82rem;border-top:1px solid var(--line);margin-top:26px;padding-top:12px}
footer{max-width:760px;margin:0 auto;padding:14px 18px 40px;color:var(--muted);font-size:.85rem}
footer a{color:var(--muted);margin-right:12px}
.cards{display:grid;gap:12px;grid-template-columns:1fr;margin:18px 0}
@media(min-width:620px){.cards{grid-template-columns:repeat(3,1fr)}}
.card{border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.card b{display:block;margin-bottom:4px}
@media(prefers-color-scheme:dark){:root{--bg:#15171a;--fg:#eef1f4;--muted:#9aa4b2;--line:#2b2f36;--chip:#22262b}
details{background:#1b1f24}a{color:#7cb6ff}}