:root{color-scheme:light dark;--bg:#f4f5fb;--card:#fff;--text:#192133;--muted:#55627a;--line:#dce1ed;--link:#4438d0}@media(prefers-color-scheme:dark){:root{--bg:#151b28;--card:#1e2839;--text:#f1f3fc;--muted:#b9c3d5;--line:#3a4558;--link:#b2aaff}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.7 system-ui,sans-serif}header{max-width:1040px;margin:auto;padding:24px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none}.brand svg{width:38px;height:38px;fill:currentColor}.brand strong{font-size:21px;letter-spacing:-.7px}.brand small{display:block;font-size:11px;color:var(--muted)}main{max-width:800px;margin:24px auto 80px;padding:0 24px}h1{font-size:clamp(28px,5vw,44px);line-height:1.15;letter-spacing:-1px;margin:0 0 28px}article,details{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:clamp(20px,4vw,36px)}h2{font-size:21px;line-height:1.4;margin:30px 0 10px}h2:first-child{margin-top:0}p{margin:10px 0 18px}a{color:var(--link);text-underline-offset:3px;overflow-wrap:anywhere}details{margin-top:20px}summary{cursor:pointer;min-height:44px;font-weight:600;padding:8px 0}nav{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:24px}a:focus-visible,summary:focus-visible{outline:3px solid var(--link);outline-offset:4px}li{margin-bottom:12px}@media(max-width:430px){header{padding:18px;align-items:flex-start}header>a:last-child{font-size:13px}main{padding:0 16px}}
.choices{display:flex;flex-wrap:wrap;gap:12px}.choices button{font:inherit;min-height:48px;padding:10px 18px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--text);cursor:pointer}.choices button:focus-visible{outline:3px solid var(--link);outline-offset:3px}
:root[data-theme=light]{color-scheme:light;--bg:#f4f5fb;--card:#fff;--text:#192133;--muted:#55627a;--line:#dce1ed;--link:#4438d0}:root[data-theme=dark]{color-scheme:dark;--bg:#151b28;--card:#1e2839;--text:#f1f3fc;--muted:#b9c3d5;--line:#3a4558;--link:#b2aaff}.header-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:12px}#theme-toggle{font:inherit;font-size:13px;min-height:44px;padding:8px 12px;color:var(--text);background:var(--card);border:1px solid var(--line);border-radius:12px;cursor:pointer}

@media(max-width:600px){header{flex-wrap:wrap}.header-actions{width:100%;justify-content:flex-end}.brand{flex-shrink:0}}