:root{--bg: #0f0f12;--surface: #18181d;--border: #2a2a32;--border-hover: #3a3a44;--text-primary: #f0f0f2;--text-secondary: #b8b8c0;--text-muted: #6e6e78;--input-bg: #1e1e24;--accent: #e68619;--accent-glow: rgba(230, 134, 25, .2);--profit-positive: #22c55e;--profit-negative: #ef4444}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Segoe UI,system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.5;color:var(--text-primary);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem}input[type=number]{-moz-appearance:textfield}input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.app{width:100%;max-width:420px;margin:0 auto;padding:2rem}.header{text-align:center;margin-bottom:2rem}.header h1{font-size:1.75rem;font-weight:700;margin:0 0 .5rem;color:var(--text-primary);letter-spacing:-.02em}.subtitle{margin:0;font-size:.95rem;color:var(--text-muted)}.calculator{display:flex;flex-direction:column;gap:1.25rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.5rem;box-shadow:0 4px 24px #00000040}.card h2{font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:0 0 1.25rem}.field{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1.25rem}.field:last-of-type{margin-bottom:0}.label{font-size:.9rem;font-weight:500;color:var(--text-secondary)}.field input{width:100%;padding:.75rem 1rem;font-size:1rem;font-family:inherit;color:var(--text-primary);background:var(--input-bg);border:1px solid var(--border);border-radius:8px;box-sizing:border-box;transition:border-color .2s,box-shadow .2s}.field input::placeholder{color:var(--text-muted)}.field input:hover{border-color:var(--border-hover)}.field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.hint{font-size:.75rem;color:var(--text-muted)}.fee-presets{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.5rem}.fee-preset-btn{background:none;border:none;padding:0;font-size:.875rem;font-weight:500;color:var(--text-muted);cursor:pointer;text-decoration:none;font-family:inherit}.fee-preset-btn:hover{color:var(--accent)}.results .result-row{display:flex;justify-content:space-between;align-items:center;padding:.6rem 0;font-size:.95rem;border-bottom:1px solid var(--border)}.results .result-row:last-child{border-bottom:none}.results .result-row.highlight{padding:.85rem 0;font-size:1.05rem;font-weight:600}.results .result-row .value{font-variant-numeric:tabular-nums}.results .result-row .value.positive{color:var(--profit-positive)}.results .result-row .value.negative{color:var(--profit-negative)}