:root{--c:#2b59c3;--ink:#1d2433;--mut:#5b6577;--bg:#f6f8fc;--card:#fff;--line:#e2e7f0}
*{box-sizing:border-box}body{margin:0;font:16px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--c)}header,footer{background:#fff;border-bottom:1px solid var(--line)}footer{border-top:1px solid var(--line);border-bottom:0;margin-top:48px;font-size:14px;color:var(--mut)}
.wrap{max-width:1100px;margin:0 auto;padding:16px}nav{display:flex;flex-wrap:wrap;gap:16px;align-items:center}nav .brand{font-weight:800;font-size:20px;text-decoration:none;color:var(--ink);margin-right:auto;display:inline-flex;align-items:center;gap:8px}nav .brand img{display:block;height:28px;width:auto;border-radius:4px}
h1{font-size:clamp(28px,5vw,42px);line-height:1.15;margin:.4em 0}.lead{font-size:18px;color:var(--mut);max-width:760px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}@media(max-width:800px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
label{display:block;font-size:14px;font-weight:600;margin:10px 0 4px}input,select,textarea{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;font:inherit}textarea{min-height:140px;font-family:ui-monospace,monospace;font-size:13px}
.btn{display:inline-block;background:var(--c);color:#fff;border:0;border-radius:8px;padding:11px 18px;font-weight:700;cursor:pointer;text-decoration:none;margin:6px 6px 0 0}.btn.alt{background:#fff;color:var(--c);border:1px solid var(--c)}
.tabs button{background:none;border:0;border-bottom:3px solid transparent;padding:10px 14px;font-weight:700;cursor:pointer;font:inherit}.tabs button.on{border-color:var(--c);color:var(--c)}
.preview{background:#fff;border:1px dashed var(--line);border-radius:8px;padding:16px;overflow:auto}.msg{font-size:14px;margin-top:8px}.ok{color:#18794e}.err{color:#b42318}
.price{font-size:40px;font-weight:800}table.cmp{width:100%;border-collapse:collapse}table.cmp td,table.cmp th{border-bottom:1px solid var(--line);padding:8px;text-align:left}
details{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:8px 0}summary{font-weight:700;cursor:pointer}