:root{color-scheme:dark;--bg:#0b0d11;--card:#151922;--line:#252b36;--ink:#eef1f6;--muted:#9aa4b2;--accent:#f5c451;--accent-ink:#17130a;--ok:#39d98a;--err:#ff6b6b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}main{max-width:560px;margin:0 auto;padding:22px 16px 72px}.top{justify-content:space-between;margin-bottom:22px}.brand,.top{display:flex;align-items:center}.brand{gap:9px;font-weight:800;font-size:19px;letter-spacing:-.01em}.brand .logo{width:30px;height:30px;border-radius:8px;display:block}.verified{font-size:12.5px;color:var(--muted);text-decoration:none}.verified:hover{color:var(--ink)}.hero{margin:4px 0 18px}.hero h1{font-size:26px;line-height:1.2;margin:0 0 8px;letter-spacing:-.02em}.hero .lede{color:var(--muted);margin:0;font-size:15.5px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:10px}.section{margin-top:22px}.section>h3{font-size:15px;color:var(--ink);margin:0 0 10px;font-weight:650}h2{margin:0;font-size:20px}label{font-size:12px;color:var(--muted);margin-top:6px}input,textarea{width:100%;background:#0f131a;border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:10px 12px;font:inherit}input:focus,textarea:focus{outline:none;border-color:var(--accent)}textarea{min-height:88px;resize:vertical}.btn,button{background:var(--accent);color:var(--accent-ink);border:0;border-radius:10px;padding:11px 14px;font:inherit;font-weight:700;cursor:pointer;text-align:center;text-decoration:none;display:inline-block}button:disabled{opacity:.5;cursor:default}.btn.ghost,button.ghost{background:transparent;border:1px solid var(--line);color:var(--ink)}.muted{color:var(--muted);margin:0}.small{font-size:13px}.ok{color:var(--ok);font-weight:600;margin:0}.err{color:var(--err);margin:0}.pill{align-self:flex-start;color:var(--muted);font-size:12.5px;font-weight:600}.content{white-space:pre-wrap;background:#0f131a;border:1px solid var(--line);border-radius:10px;padding:12px}footer{margin-top:34px;padding-top:18px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:12.5px}footer,footer a{color:var(--muted)}footer a{text-decoration:none;border-bottom:1px solid var(--line)}footer a:hover{color:var(--ink)}footer .spacer{flex:1 1}.chessboard{display:grid;grid-template-columns:repeat(8,1fr);width:100%;max-width:420px;margin:10px auto;aspect-ratio:1;border:2px solid var(--line);border-radius:8px;overflow:hidden}.csq{display:flex;align-items:center;justify-content:center;font-size:clamp(20px,6.5vw,34px);line-height:1;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none;aspect-ratio:1}.csq.light{background:#e9e2cf}.csq.dark{background:#7d9b76}.csq.sel{outline:3px solid var(--accent,#f5c451);outline-offset:-3px}.csq .wp{color:#fbfbfb;text-shadow:0 1px 2px rgba(0,0,0,.55)}.csq .bp{color:#1a1a1a;text-shadow:0 1px 1px rgba(255,255,255,.25)}.vtabs{display:flex;gap:8px;margin:4px 0 2px}.vtab{flex:1 1;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px;color:var(--muted,#9aa4b2);font-size:15px;cursor:pointer}.vtab.on{border-color:var(--accent,#f5c451);color:var(--accent,#f5c451);background:rgba(245,196,81,.1)}.how,.safe{margin:0;padding-left:20px;display:grid;grid-gap:7px;gap:7px;color:var(--muted);font-size:14px}.how b,.safe b{color:var(--ink);font-weight:600}