:root{--bg:#171a2d;--surface:#1f2340;--line:#343a5f;--text:#ece6dc;--muted:#a3a7c2;--accent:#e0613f;color-scheme:dark}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 'Bricolage Grotesque',system-ui,-apple-system,'Segoe UI',sans-serif}
a{color:#f0a58f}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
header{padding:40px 0 24px}
.brand{display:flex;align-items:center;gap:18px}
.brand img{width:72px;height:72px;object-fit:contain}
h1{margin:0;font-size:clamp(1.9rem,5vw,3rem);line-height:1.05;font-weight:800;letter-spacing:-.02em}
.sub{margin:14px 0 0;color:var(--muted);max-width:58ch}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:#10132288;padding:.1em .35em;border-radius:4px}
.bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:14px 0 6px;border-top:1px solid var(--line)}
.bar button{font:inherit;font-size:.9rem;color:var(--muted);background:none;border:1px solid var(--line);border-radius:999px;padding:3px 14px;cursor:pointer}
.bar button[aria-pressed=true]{color:var(--bg);background:var(--text);border-color:var(--text)}
#prog{margin-left:auto;color:var(--muted);font-size:.9rem}
section{margin:34px 0;--d:#e8c9a0}
section>h2{margin:0 0 10px;padding-left:14px;border-left:6px solid var(--d);font-size:1.6rem;font-weight:800;display:flex;align-items:baseline;gap:12px}
section>h2 small{font-size:.9rem;font-weight:400;color:var(--muted)}
.ch{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--d);border-radius:6px;margin:8px 0}
.ch>summary{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 14px;padding:12px 16px;cursor:pointer;list-style:none}
.ch>summary::-webkit-details-marker{display:none}
.nm{font-weight:600;font-size:1.05rem}
.cat{color:var(--d);font-size:.9rem}
.au{color:var(--muted);font-size:.9rem}
.ok{display:none;margin-left:auto;color:#8fd19e;font-size:.9rem}
.solved .ok{display:inline}
.body{padding:2px 16px 18px;border-top:1px solid var(--line)}
.md{max-width:70ch}
.md pre{overflow-x:auto;background:#10132299;padding:10px 12px;border-radius:6px}
.md img{max-width:100%}
.conn{display:flex;gap:8px;align-items:center;margin:12px 0;flex-wrap:wrap}
.conn code{padding:6px 10px;overflow-wrap:anywhere}
button.s{font:inherit;font-size:.85rem;color:var(--text);background:none;border:1px solid var(--line);border-radius:6px;padding:3px 10px;cursor:pointer}
.files a{display:inline-block;margin:0 14px 6px 0}
.hint{margin:6px 0}
.hint summary{cursor:pointer;color:var(--muted)}
.tags{color:var(--muted);font-size:.85rem;margin:10px 0}
.flag{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}
.flag input{flex:1 1 240px;font:inherit;font-family:ui-monospace,Menlo,Consolas,monospace;color:var(--text);background:#101322;border:1px solid var(--line);border-radius:6px;padding:8px 12px}
.flag button{font:inherit;font-weight:600;color:#fff;background:var(--accent);border:0;border-radius:6px;padding:8px 18px;cursor:pointer}
.flag button:disabled{opacity:.6;cursor:wait}
.msg{min-height:1.4em;margin:8px 0 0;font-size:.95rem}
.msg.good{color:#8fd19e}.msg.bad{color:#ff9d8a}
#status{color:var(--muted);padding:40px 0}
footer{border-top:1px solid var(--line);margin-top:48px;padding:20px 0 48px;color:var(--muted);font-size:.9rem}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}