:root{--bg:#f7f8fa;--fg:#1b1f24;--card:#fff;--ac:#4f46e5;--bd:#e2e5ea}
@media(prefers-color-scheme:dark){:root{--bg:#14161a;--fg:#e8eaed;--card:#1d2026;--bd:#2d3139}}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:var(--bg);color:var(--fg);line-height:1.5}
header{display:flex;flex-wrap:wrap;gap:12px;align-items:center;padding:12px 20px;background:var(--card);border-bottom:1px solid var(--bd)}
.logo{font-weight:800;font-size:1.3rem;text-decoration:none;color:var(--fg)}.logo span{color:var(--ac)}
nav{display:flex;flex-wrap:wrap;gap:14px}nav a{color:var(--fg);text-decoration:none;font-size:.9rem}nav a:hover{color:var(--ac)}
main{max-width:960px;margin:0 auto;padding:20px}footer{text-align:center;padding:20px;font-size:.85rem;opacity:.8}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--bd);border-radius:10px;padding:16px;text-decoration:none;color:inherit}
.card:hover{border-color:var(--ac)}.card h2{margin:0 0 6px;font-size:1.05rem}
.ad{min-height:90px;margin:16px 0;border:1px dashed var(--bd);display:flex;align-items:center;justify-content:center;font-size:.8rem;opacity:.6}
textarea,input,select{width:100%;padding:10px;border:1px solid var(--bd);border-radius:8px;background:var(--card);color:var(--fg);font:inherit}
textarea{min-height:200px;font-family:ui-monospace,monospace;font-size:.9rem}
button{padding:9px 16px;border:0;border-radius:8px;background:var(--ac);color:#fff;font:inherit;cursor:pointer;margin:8px 8px 8px 0}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:700px){.row{grid-template-columns:1fr}}
.err{color:#dc2626}pre{white-space:pre-wrap;word-break:break-all}