:root{--bg:#f8fafc;--card:#fff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--primary:#2563eb;--primary-dark:#1d4ed8;--accent:#f59e0b}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.55}a{color:var(--primary)}.container{max-width:920px;margin:0 auto;padding:32px 20px 64px}.hero{text-align:center;padding:28px 0 8px}.hero h1{font-size:40px;line-height:1.1;margin:0 0 12px;letter-spacing:-.02em}.hero p{font-size:18px;color:var(--muted);margin:0 auto;max-width:560px}.tariffs{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px;margin:28px 0}.tariff-card{background:var(--card);border:2px solid var(--line);border-radius:14px;padding:20px;cursor:pointer;transition:border-color .15s,box-shadow .15s}.tariff-card:hover{border-color:#cbd5e1}.tariff-card.active{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}.tariff-card .name{font-weight:600;font-size:18px}.tariff-card .price{font-size:30px;font-weight:700;margin:6px 0}.tariff-card .price span{font-size:15px;font-weight:400;color:var(--muted)}.tariff-card .limit{color:var(--muted);font-size:14px}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}.field{margin-bottom:18px}.field label{display:block;font-weight:600;font-size:14px;margin-bottom:6px}.field input,.field select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;background:#fff;color:var(--ink)}.field input:focus,.field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}.hint{font-size:13px;color:var(--muted);margin-top:4px}.styles{display:grid;grid-template-columns:1fr 1fr 1fr;grid-gap:10px;gap:10px}.style-opt{border:1px solid var(--line);border-radius:10px;padding:12px;text-align:center;cursor:pointer;font-size:14px;font-weight:500}.style-opt.active{border-color:var(--primary);background:rgba(37,99,235,.06);color:var(--primary-dark)}.btn{width:100%;padding:14px 20px;background:var(--primary);color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer;transition:background .15s}.btn:hover{background:var(--primary-dark)}.btn:disabled{opacity:.6;cursor:not-allowed}.error{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:10px 14px;margin-bottom:16px}.error,.total{font-size:14px}.total{text-align:center;color:var(--muted);margin-top:12px}.center-box{max-width:540px;margin:60px auto;text-align:center}.spinner{width:42px;height:42px;border:4px solid var(--line);border-top-color:var(--primary);border-radius:50%;margin:0 auto 20px;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.footer{text-align:center;color:var(--muted);font-size:13px;margin-top:40px}@media (max-width:640px){.tariffs{grid-template-columns:1fr}.hero h1{font-size:30px}}