:root{--bg:#fff;--fg:#111827;--muted:#6b7280;--card:#f9fafb;--line:#e5e7eb;--brand:#4f46e5;--brand2:#7c3aed;--r:14px}
@media(prefers-color-scheme:dark){:root{--bg:#0f1117;--fg:#f3f4f6;--muted:#9ca3af;--card:#181b25;--line:#2a2f3d;--brand:#818cf8;--brand2:#a78bfa}}
*{box-sizing:border-box}
body{margin:0;font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--brand)}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--fg);text-decoration:none}
.logo img{border-radius:8px}
header nav a{margin-left:18px;text-decoration:none;color:var(--muted);font-weight:500}
.crumbs{font-size:.875rem;color:var(--muted);padding-top:16px}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(1.7rem,4vw,2.3rem);line-height:1.2;margin:.4em 0 .3em}
h2{font-size:1.35rem;margin:1.8em 0 .5em}
.lead{color:var(--muted);font-size:1.075rem;margin-top:0}
.meta{font-size:.85rem;color:var(--muted)}
.tool{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;margin:22px 0}
label{display:block;font-weight:600;font-size:.9rem;margin:14px 0 6px}
input,select,textarea{width:100%;padding:11px 12px;font:inherit;color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:10px}
textarea{font:.85rem/1.4 ui-monospace,monospace}
input:focus,select:focus,button:focus-visible{outline:3px solid var(--brand);outline-offset:1px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:560px){.row{grid-template-columns:1fr}}
button{cursor:pointer;font:inherit;font-weight:600;border:0;border-radius:10px;padding:11px 18px;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2))}
button.ghost{background:transparent;color:var(--brand);border:1px solid var(--line)}
.result{margin-top:18px;padding:18px;border-radius:12px;background:var(--bg);border:1px solid var(--line)}
.big{font-size:2rem;font-weight:800;color:var(--brand)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.card{display:block;padding:16px;border:1px solid var(--line);border-radius:var(--r);background:var(--card);text-decoration:none;color:var(--fg)}
.card:hover{border-color:var(--brand)}
.card b{display:block}.card span{color:var(--muted);font-size:.9rem}
.toc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 18px}
.toc ul{margin:6px 0;padding-left:18px}
details{border-bottom:1px solid var(--line);padding:10px 0}
summary{cursor:pointer;font-weight:600}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.actions a{padding:11px 18px;border:1px solid var(--line);border-radius:10px;text-decoration:none;font-weight:600}
footer.site{margin-top:60px;border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:.9rem}
footer.site a{color:var(--muted);margin-right:14px}
.hero{padding:40px 0 10px}
#q{font-size:1.05rem;padding:14px 16px}
.onlyembed{display:none}
.embed header.site,.embed .noembed{display:none}
.embed .onlyembed{display:block;text-align:right;font-size:.8rem}
.embed .tool{margin:0}
h3{font-size:1.1rem;margin:1.2em 0 .4em}
.tabs{display:flex;gap:8px;margin-bottom:6px}
button.tab{background:transparent;color:var(--brand);border:1px solid var(--line)}
button.tab.on{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-color:transparent}
.row3{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:14px}
@media(max-width:560px){.row3{grid-template-columns:1fr}}
.prow{grid-template-columns:1fr auto;align-items:center;margin-bottom:8px}
.item{border:1px solid var(--line);border-radius:12px;padding:12px;margin:10px 0;background:var(--bg)}
.chips{margin:8px 0}
.chips label{display:inline-flex;align-items:center;gap:6px;margin:4px 14px 4px 0;font-weight:500}
.chips input{width:auto}
button.rm{background:transparent;color:var(--muted);border:1px solid var(--line);padding:6px 12px;font-weight:500}
.res{width:100%;border-collapse:collapse;margin-bottom:8px}
.res th,.res td{text-align:right;padding:8px 6px;border-bottom:1px solid var(--line)}
.res th:first-child,.res td:first-child{text-align:left}

.video-block{margin:28px 0}
.yt-facade{position:relative;max-width:480px;cursor:pointer;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.yt-facade img{display:block;width:100%;height:auto}
.yt-facade .yt-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:64px;height:64px;line-height:64px;text-align:center;font-size:22px;color:#fff;background:rgba(0,0,0,.65);border-radius:50%}
.yt-facade:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.video-block iframe{width:100%;max-width:480px;aspect-ratio:16/9;border:0;border-radius:12px}