:root{--bg: #0f172a;--card: #1e293b;--text: #e2e8f0;--muted: #94a3b8;--accent: #38bdf8;--error: #f87171;--border: #334155;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);min-height:100vh}.app{max-width:640px;margin:0 auto;padding:2rem 1rem 4rem}.footer-counter{position:fixed;left:0;right:0;bottom:0;padding:.5rem 1rem;text-align:center;font-size:.8125rem;color:var(--muted);background:#0f172ad9;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border-top:1px solid var(--border);font-variant-numeric:tabular-nums;z-index:10}h1{margin:0 0 1.5rem;font-size:1.75rem}h2{margin:0;font-size:1rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.05em}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.25rem;margin-bottom:1rem}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.field{display:flex;flex-direction:column;gap:.25rem;flex:1;min-width:0}.field span{font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}.row{display:flex;gap:.5rem;align-items:flex-end;margin-top:1rem}input,select{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:.5rem .75rem;font-size:1rem;font-family:inherit;width:100%}input[readonly]{color:var(--accent);font-weight:600}input:focus,select:focus{outline:none;border-color:var(--accent)}button{background:var(--accent);color:var(--bg);border:0;border-radius:6px;padding:.5rem .75rem;font-size:1rem;cursor:pointer;font-family:inherit}button:hover{filter:brightness(1.1)}button.ghost{background:transparent;color:var(--muted);border:1px solid var(--border);font-size:.75rem;padding:.25rem .5rem}#swap{align-self:flex-end;height:38px;width:38px;flex-shrink:0;font-size:1.1rem}.error{color:var(--error);margin:.75rem 0 0;font-size:.875rem}.history{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.4rem}.history li{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:.5rem .75rem;display:flex;justify-content:space-between;font-variant-numeric:tabular-nums}.history li.empty{color:var(--muted);font-style:italic;justify-content:center}.history .from{color:var(--muted)}.history .arrow{margin:0 .5rem;color:var(--muted)}.history .to{color:var(--accent);font-weight:600}