*{box-sizing:border-box}:root{--primary:#111827;--primary-hover:#374151;--bg:#f5f7fb;--card-bg:white;--border:#e5e7eb;--text:#111827;--text-secondary:#6b7280;--error:#b91c1c;--success:#059669;--radius:16px;--radius-lg:24px}html,body{background:var(--bg);min-height:100%;color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}a{color:inherit}.container{flex-direction:column;width:100%;max-width:480px;min-height:100dvh;margin:0 auto;padding:16px;display:flex}.hero{text-align:center;padding:12px 0 8px}.hero h1{letter-spacing:-.02em;margin:0 0 4px;font-size:clamp(22px,5vw,28px);font-weight:800;line-height:1.2}.hero p{color:var(--text-secondary);margin:0;font-size:14px}.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius-lg);flex:1;padding:20px;box-shadow:0 4px 24px #0f172a0f}.field{gap:6px;display:grid}label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;font-size:12px;font-weight:700}input,select{border:2px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text);appearance:none;background:#fff;padding:14px 16px;font-size:18px;font-weight:600;transition:border-color .15s,box-shadow .15s}input:focus,select:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #1118271a}select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-position:right 14px center;background-repeat:no-repeat;padding-right:40px}.currency-row{grid-template-columns:1fr auto 1fr;align-items:end;gap:8px;display:grid}.swap-btn{border:2px solid var(--border);cursor:pointer;background:#fff;border-radius:50%;place-items:center;width:44px;height:44px;margin-bottom:2px;transition:all .15s;display:grid}.swap-btn:active{background:var(--bg);transform:scale(.92)}.swap-btn svg{width:20px;height:20px;color:var(--text-secondary)}.amount-input{text-align:center;padding:16px;font-size:28px;font-weight:700}button[type=submit],.convert-btn{border-radius:var(--radius);cursor:pointer;background:var(--primary);color:#fff;border:0;width:100%;min-height:52px;margin-top:16px;padding:16px 20px;font-size:17px;font-weight:700;transition:background .15s,transform .1s}button:active{transform:scale(.98)}button:disabled{opacity:.5;cursor:not-allowed;transform:none}.spinner{vertical-align:middle;border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:18px;height:18px;margin-right:8px;animation:.6s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.result{border-radius:var(--radius);text-align:center;background:linear-gradient(135deg,#f0fdf4 0%,#ecfdf5 100%);border:1px solid #bbf7d0;margin-top:16px;padding:16px}.result-amount{color:var(--text-secondary);margin-bottom:4px;font-size:14px}.result strong{color:var(--success);margin:4px 0;font-size:32px;font-weight:800;display:block}.result-rate{color:var(--text-secondary);margin-top:4px;font-size:12px}.error{border-radius:var(--radius);color:var(--error);text-align:center;background:#fef2f2;border:1px solid #fecaca;margin-top:12px;padding:12px;font-size:14px;font-weight:600}.adBox{border-radius:var(--radius);min-height:100px;color:var(--text-secondary);text-align:center;background:#fafafa;border:1px dashed #d1d5db;place-items:center;margin:16px 0;padding:12px;font-size:13px;display:grid}.footer{text-align:center;color:var(--text-secondary);margin-top:auto;padding:16px 0 8px;font-size:12px}@media (min-width:700px){.container{max-width:520px;padding:32px 20px}.hero{padding:24px 0 16px}.hero h1{font-size:36px}.hero p{font-size:16px}.card{padding:28px}}