:root{
  --bg:#f4f8f5; --surface:#ffffff; --ink:#1c2b23; --muted:#5b6b61;
  --primary:#059669; --primary-dark:#047857; --teal:#0d9488; --line:#dde8e0;
  --soft:#ecfdf5; --radius:16px; --shadow:0 10px 30px rgba(5,150,105,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--primary-dark)}
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.3rem}
.logo-badge{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,#059669,#0d9488);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem}
.logo em{font-style:normal;background:linear-gradient(45deg,#059669,#0d9488);-webkit-background-clip:text;background-clip:text;color:transparent}
.main-nav{display:flex;gap:22px}
.main-nav a{color:var(--ink);text-decoration:none;font-weight:600;font-size:.98rem}
.main-nav a:hover{color:var(--primary)}
.nav-toggle{display:none;background:none;border:0;font-size:1.5rem;cursor:pointer;color:var(--ink)}
.hero{background:linear-gradient(160deg,#fff 0%,var(--soft) 100%);border-bottom:1px solid var(--line);padding:52px 0 38px;text-align:center}
.hero h1{font-size:2.35rem;line-height:1.15;margin:0 0 12px}
.hero h1 .grad{background:linear-gradient(45deg,#059669,#0d9488);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lede{color:var(--muted);font-size:1.1rem;max-width:680px;margin:0 auto 24px}
.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;max-width:860px;margin:0 auto;text-align:left}
.tool-card label{font-weight:700;display:block;margin-bottom:8px}
.tool-hint{color:var(--muted);font-size:.9rem;margin:10px 0 0;text-align:center}
.field-note{color:var(--muted);font-size:.85rem;margin:6px 0 0}
.mode-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.mode-btn{flex:1;min-width:200px;background:#fff;color:var(--ink);border:2px solid var(--line);border-radius:12px;padding:12px 16px;font-size:1rem;font-weight:700;cursor:pointer}
.mode-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.mode-btn:hover{border-color:var(--primary)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid input,.form-grid select{width:100%;padding:12px 14px;border:2px solid var(--line);border-radius:12px;font-size:1rem;background:#fff;color:var(--ink)}
.form-grid input:focus,.form-grid select:focus{outline:3px solid var(--primary);outline-offset:1px;border-color:var(--primary)}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-top:18px}
.btn-primary{background:var(--primary);color:#fff;border:0;border-radius:12px;padding:14px 26px;font-size:1.05rem;font-weight:800;cursor:pointer}
.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:#fff;color:var(--ink);border:2px solid var(--line);border-radius:12px;padding:14px 22px;font-size:1rem;font-weight:700;cursor:pointer}
.form-error{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;border-radius:12px;padding:12px 16px;margin-top:16px;text-align:center;font-weight:600}
.results-h{margin:28px 0 4px;text-align:center}
.estimate-tag{text-align:center;color:#92400e;background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:8px 12px;font-weight:700;font-size:.9rem}
.readout{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}
.stat{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
.stat.highlight{background:#059669;border-color:#059669}
.stat.highlight .big,.stat.highlight .lbl{color:#fff}
.stat .big{font-size:1.7rem;font-weight:800;line-height:1.1;color:var(--primary-dark)}
.stat .lbl{font-size:.85rem;color:var(--muted);font-weight:600}
.breakdown{width:100%;border-collapse:collapse;margin-top:18px;font-size:.98rem}
.breakdown th,.breakdown td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left}
.breakdown td:last-child,.breakdown th:last-child{text-align:right;font-variant-numeric:tabular-nums}
.breakdown .total-row td{font-weight:700}
.breakdown .net-row td{color:var(--primary-dark);font-size:1.05rem}
.content{padding:38px 20px 56px}
.content section{margin-bottom:34px}
.content h2{font-size:1.6rem;margin:0 0 10px}
.steps{padding-left:22px}
.steps li{margin-bottom:8px}
details{border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px;background:var(--surface)}
details summary{font-weight:700;cursor:pointer}
details p{margin:8px 0 0;color:var(--muted)}
.site-footer{background:#1c2b23;color:#cbd5cf;margin-top:0}
.site-footer a{color:#a7f3d0;text-decoration:none;display:block;margin-bottom:8px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;padding:36px 20px 10px}
.footer-brand{font-weight:800;font-size:1.15rem;color:#fff;margin:0 0 8px}
.footer-h{font-weight:700;color:#fff;margin:0 0 10px}
.footer-bottom{border-top:1px solid #33463b;padding:16px 20px 28px;font-size:.9rem;color:#94a89e}
@media (max-width:820px){
  .form-grid,.footer-grid,.readout{grid-template-columns:1fr}
  .hero h1{font-size:1.75rem}
  .stat .big{font-size:1.5rem}
  .main-nav{display:none;position:absolute;top:60px;right:16px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);flex-direction:column;padding:14px 18px;gap:12px}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
}