:root{--bg: #0f172a;--surface: #1e293b;--surface2: #334155;--text: #f1f5f9;--text-muted: #94a3b8;--accent: #3b82f6;--accent-hover: #2563eb;--border: #475569;--success: #22c55e;--radius: 10px;--shadow: 0 4px 24px rgba(0,0,0,.3)}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.skip-link{position:absolute;top:-40px;left:0;background:var(--accent);color:#fff;padding:8px 16px;z-index:100;border-radius:0 0 6px;text-decoration:none;font-weight:600;font-size:14px}.skip-link:focus{top:0}.container{max-width:1100px;margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:50}.site-header .container{display:flex;align-items:center;justify-content:space-between}.site-logo{font-weight:700;font-size:18px;color:var(--accent);text-decoration:none}.site-nav{display:flex;gap:20px}.site-nav a{color:var(--text-muted);text-decoration:none;font-size:14px;font-weight:500;transition:color .2s}.site-nav a:hover{color:var(--text)}.hero{text-align:center;padding:40px 0 20px}.hero h1{font-size:2rem;margin:0 0 12px;background:linear-gradient(135deg,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.lead{color:var(--text-muted);font-size:1.05rem;max-width:680px;margin:0 auto;line-height:1.7}.tool-section{margin:30px 0}.controls-panel{background:var(--surface);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:24px}.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}@media (max-width:640px){.tool-grid{grid-template-columns:1fr}}.input-group{display:flex;flex-direction:column;gap:6px}.input-group label{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted)}.input-group select,.input-group input{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:12px 14px;color:var(--text);font-size:16px;outline:none;transition:border-color .2s}.input-group select:focus,.input-group input:focus{border-color:var(--accent)}.input-group input{font-size:20px;font-weight:600;font-family:JetBrains Mono,monospace}.input-with-suffix{position:relative;display:flex;align-items:center}.input-with-suffix input{flex:1;padding-right:40px}.input-with-suffix .suffix{position:absolute;right:14px;color:var(--text-muted);font-size:16px;font-weight:600;pointer-events:none}.results-panel{background:var(--surface);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:24px}.result-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border)}.result-row:last-child{border-bottom:none;font-weight:700}.result-row .label{color:var(--text-muted);font-size:14px}.result-row .value{font-size:18px;font-weight:600;color:var(--text);font-family:JetBrains Mono,monospace}.result-row .value.negative{color:#ef4444}.result-row .value.positive{color:var(--success)}.result-breakdown{background:var(--surface2);border-radius:8px;padding:16px;margin-top:12px;font-size:13px;color:var(--text-muted);line-height:1.8}.result-breakdown span{display:block}.export-bar{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-outline:hover{background:var(--surface2);border-color:var(--text-muted)}.copy-feedback{font-size:13px;color:var(--success);opacity:0;transition:opacity .3s;align-self:center}.copy-feedback.show{opacity:1}.content-section{padding:32px 0;border-top:1px solid var(--border)}.content-section h2{font-size:1.5rem;margin:0 0 20px;color:var(--text)}.content-section h3{font-size:1.1rem;margin:24px 0 10px;color:var(--text)}.content-section p,.content-section li{color:var(--text-muted);line-height:1.7}.steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;padding:0;list-style:none}.steps li{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;font-size:14px}.steps li strong{display:block;color:var(--text);margin-bottom:4px}.faq-item{margin-bottom:20px}.faq-item h3{font-size:1rem;margin:0 0 6px;color:var(--text)}.faq-item p{margin:0;color:var(--text-muted);font-size:14px}.rec-links{display:flex;flex-wrap:wrap;gap:10px}.rec-pill{display:inline-block;padding:8px 16px;background:var(--surface);border:1px solid var(--border);border-radius:20px;color:var(--text);text-decoration:none;font-size:13px;font-weight:500;transition:all .2s}.rec-pill:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.site-footer{border-top:1px solid var(--border);padding:24px 0;text-align:center}.site-footer p{margin:0;font-size:13px;color:var(--text-muted)}.site-footer a{color:var(--accent);text-decoration:none}@media (max-width:768px){.hero h1{font-size:1.5rem}.steps{grid-template-columns:1fr}.export-bar{flex-direction:column}.btn{justify-content:center}}