:root{--primary: #2563eb;--primary-dark: #1e40af;--bg: #f8fafc;--card: #ffffff;--text: #0f172a;--border: #e2e8f0;--radius: 16px}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,Noto Sans Devanagari,sans-serif}body{background:var(--bg);color:var(--text);padding:40px 15px}.container{max-width:800px;margin:0 auto}.header{text-align:center;margin-bottom:35px}.header a{text-decoration:none;color:var(--primary);transition:.3s}.header h1{font-size:32px;font-weight:800;letter-spacing:-1px}.tabs{display:flex;background:#e2e8f0;padding:5px;border-radius:var(--radius);margin-bottom:30px;border:1px solid var(--border)}.tab-btn{flex:1;padding:14px;border:none;background:none;cursor:pointer;border-radius:12px;font-weight:700;color:#64748b;font-size:14px;transition:.2s}.tab-btn.active{background:#fff;color:var(--primary);box-shadow:0 4px 6px #0000001a}.card{background:var(--card);border-radius:var(--radius);padding:30px;border:1px solid var(--border);box-shadow:0 4px 6px -1px #0000000d}.panel{animation:fadeIn .4s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.drop-zone{border:2.5px dashed #cbd5e1;border-radius:14px;padding:40px 20px;text-align:center;cursor:pointer;background:#fafbfc;transition:.3s;position:relative;margin-bottom:15px}.drop-zone:hover{border-color:var(--primary);background:#eff6ff}.drop-zone input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.file-item{display:flex;justify-content:space-between;padding:10px;background:#f1f5f9;border-radius:8px;margin-bottom:8px;font-size:13px;font-weight:600}.levels{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-bottom:20px}@media(max-width:900px){.levels{grid-template-columns:repeat(2,1fr)}}@media(max-width:640px){.levels{grid-template-columns:1fr}}.lv-card{border:2px solid var(--border);border-radius:10px;padding:12px 8px;text-align:center;cursor:pointer;background:#fff;font-size:12px}.lv-card.selected{border-color:var(--primary);background:#eff6ff;color:var(--primary)}.btn-main{width:100%;padding:16px;border:none;border-radius:12px;font-weight:800;font-size:16px;cursor:pointer;background:var(--primary);color:#fff;transition:.2s}.btn-main:hover:not(:disabled){transform:translateY(-2px);background:var(--primary-dark)}.btn-main:disabled{background:#cbd5e1;cursor:not-allowed;transform:none}.logo-prev{width:100px;height:100px;object-fit:contain;margin:10px auto;border:1px solid #ddd;border-radius:8px;display:none}.logo-prev.is-visible{display:block}footer{text-align:center;margin-top:50px;font-size:14px;color:#64748b;font-weight:500}footer a{color:var(--primary);text-decoration:none;font-weight:700;transition:.2s}footer a:hover{text-decoration:underline}