:root{--bg:#0f1115;--card:#151a22;--text:#e9eef7;--muted:#9aa7bd;--line:#263145;--btn:#2b7cff}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;color:var(--text);background:linear-gradient(180deg,#0b0d12,#0f1115)}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(15,17,21,.9);backdrop-filter: blur(8px)}
.brand{font-weight:700}
.right{display:flex;gap:10px;align-items:center}
.card{max-width:920px;margin:22px auto;padding:18px;border:1px solid var(--line);border-radius:16px;background:rgba(21,26,34,.92);box-shadow: 0 10px 30px rgba(0,0,0,.25)}
.grid{max-width:1200px;margin:22px auto;display:grid;grid-template-columns: 1.2fr .8fr;gap:16px;padding:0 14px}
h2{margin:0 0 10px}
label{display:block;font-size:13px;color:var(--muted);margin:12px 0 6px}
input{width:100%;padding:12px 12px;border-radius:12px;border:1px solid var(--line);background:#0c0f14;color:var(--text);outline:none}
input:focus{border-color:#3c8bff}
.row{display:flex;gap:10px;align-items:center;margin-top:12px;flex-wrap:wrap}
.btn{border:0;border-radius:12px;padding:10px 14px;background:var(--btn);color:white;font-weight:700;cursor:pointer}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}
.muted{color:var(--muted);font-size:13px}
.msg{margin-top:12px;font-size:13px;color:#ffd38a;min-height:18px}
.pre{margin:0;margin-top:10px;padding:12px;border-radius:12px;border:1px dashed var(--line);background:#0c0f14;white-space:pre-wrap;min-height:140px;color:#cfe3ff}
@media(max-width:980px){.grid{grid-template-columns:1fr}}