*{box-sizing:border-box}
html{font-family:Arial,Helvetica,sans-serif;background:#f2f3f5;color:#1b1d20}
body{margin:0;padding:32px 16px}
.wrap{max-width:720px;margin:0 auto}
.panel{background:#fff;border:1px solid #d9dde3;border-radius:10px;padding:28px;box-shadow:0 4px 18px rgba(0,0,0,.05)}
h1{margin:0 0 6px;font-size:26px}
h2{font-size:18px;margin:0 0 14px}
.intro{margin:0 0 24px;color:#5d626b;line-height:1.5}
.field-label,legend{display:block;font-weight:700;font-size:14px;margin-bottom:8px}
input[type=url],input[type=number],select{width:100%;height:44px;border:1px solid #bfc5cd;border-radius:6px;background:#fff;padding:0 12px;font-size:16px;color:#17191c;outline:none}
input:focus,select:focus{border-color:#3367d6;box-shadow:0 0 0 3px rgba(51,103,214,.12)}
fieldset{border:0;padding:0;margin:20px 0}
.presets{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.preset{position:relative;cursor:pointer}
.preset input{position:absolute;opacity:0;pointer-events:none}
.preset span{display:block;border:1px solid #cbd0d7;border-radius:7px;padding:12px;min-height:68px;background:#fff}
.preset strong,.preset small{display:block}
.preset small{margin-top:5px;color:#6b7078;font-size:12px}
.preset input:checked+span{border-color:#3367d6;background:#f3f7ff;box-shadow:0 0 0 1px #3367d6 inset}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.with-unit{display:grid;grid-template-columns:1fr 48px;align-items:center}
.with-unit input{border-radius:6px 0 0 6px}
.with-unit span{height:44px;border:1px solid #bfc5cd;border-left:0;border-radius:0 6px 6px 0;background:#f5f6f7;display:flex;align-items:center;justify-content:center;font-weight:700;color:#5c6169}
.note,.print-note{font-size:13px;line-height:1.5;color:#5b616a;background:#f6f7f9;border-radius:6px;padding:11px 12px}
.print-note{margin-top:24px;border-left:3px solid #8c939c}
.message{margin-top:12px;border-radius:6px;padding:10px 12px;font-size:13px;line-height:1.45}
.error{background:#fff1f1;border:1px solid #efb6b6;color:#8a1f1f}
.status{background:#eef7ee;border:1px solid #b8dab8;color:#255d25}
button{font:inherit;cursor:pointer;border-radius:6px;height:44px;padding:0 18px;font-weight:700}
.primary{width:100%;margin-top:16px;border:0;background:#2457c5;color:#fff}
.primary:hover{background:#1d49a7}
.secondary{border:1px solid #b9bec6;background:#fff;color:#24272b;margin-top:12px}
.result{border-top:1px solid #e0e3e7;margin-top:24px;padding-top:22px}
.preview{width:300px;height:300px;max-width:100%;background:#fff;border:1px solid #d7dbe1;display:flex;align-items:center;justify-content:center;padding:8px}
.preview img{display:block;max-width:100%;max-height:100%;image-rendering:pixelated}
@media(max-width:620px){body{padding:12px}.panel{padding:20px}.presets{grid-template-columns:1fr}.row{grid-template-columns:1fr}.preview{width:100%;height:auto;aspect-ratio:1}}