:root{--brand-dark:#062c43;--brand-mid:#0e7490;--brand-bright:#0891b2;--accent:#0e7490;--accent-dark:#155e75;--accent-soft:#e0f4fa;--brand-mint:#7dd3fc;--brand-tag:#a5d8e6;--bg:#f8fafb;--surface:#fff;--ink:#16232e;--ink-soft:#4d6070;--border:#dde5ea;--radius:10px;--shadow:0 1px 3px #16232e14, 0 4px 16px #16232e0d}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);flex-direction:column;min-height:100dvh;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:17px;line-height:1.6;display:flex}.wrap{max-width:760px;margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.site-header:before{content:"";background:linear-gradient(90deg, var(--brand-dark), var(--brand-mid) 55%, var(--brand-bright));height:4px;display:block}.site-header .wrap{justify-content:space-between;align-items:center;padding-top:14px;padding-bottom:14px;display:flex}.logo{color:var(--ink);letter-spacing:-.02em;font-size:1.15rem;font-weight:800;text-decoration:none}.logo span{color:var(--accent)}.site-header nav a{color:var(--ink-soft);margin-left:18px;font-size:.95rem;text-decoration:none}.site-header nav a:hover{color:var(--accent)}main{flex:1;padding:32px 0 56px}h1{letter-spacing:-.02em;margin:0 0 8px;font-size:1.9rem;line-height:1.25}.subtitle{color:var(--ink-soft);margin:0 0 24px;font-size:1.05rem}h2{letter-spacing:-.01em;margin:36px 0 10px;font-size:1.35rem}h3{margin:24px 0 8px;font-size:1.1rem}a{color:var(--accent)}.calc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin:0 0 12px;padding:24px}.calc .field{margin-bottom:16px}.calc label{margin-bottom:6px;font-size:.92rem;font-weight:600;display:block}.calc input[type=number],.calc select{border:1px solid var(--border);width:100%;color:var(--ink);background:#fff;border-radius:8px;padding:10px 12px;font-size:1.05rem}.calc input:focus,.calc select:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}.calc .row{grid-template-columns:1fr 1fr;gap:14px;display:grid}@media (width<=540px){.calc .row{grid-template-columns:1fr}}.calc .hint{color:var(--ink-soft);margin-top:4px;font-size:.82rem}.results{background:var(--accent-soft);border-radius:8px;margin-top:20px;padding:18px 20px}.results .big{color:var(--accent-dark);letter-spacing:-.02em;font-size:1.9rem;font-weight:800}.results .big-label{color:var(--accent-dark);text-transform:uppercase;letter-spacing:.04em;font-size:.85rem;font-weight:600}.results table{border-collapse:collapse;width:100%;margin-top:10px;font-size:.98rem}.results td{border-bottom:1px solid color-mix(in srgb, var(--accent) 15%, transparent);padding:6px 0}.results tr:last-child td{border-bottom:none}.results td:last-child{text-align:right;font-variant-numeric:tabular-nums;font-weight:700}.disclaimer{color:var(--ink-soft);margin:10px 0 0;font-size:.82rem}.content{margin-top:8px}.content .formula{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:14px 18px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.95rem;overflow-x:auto}.faq details{background:var(--surface);border:1px solid var(--border);border-radius:8px;margin-bottom:10px;padding:14px 18px}.faq summary{cursor:pointer;font-weight:600}.faq details p{color:var(--ink-soft);margin:10px 0 0}.tool-grid{grid-template-columns:1fr 1fr;gap:14px;margin-top:18px;display:grid}@media (width<=540px){.tool-grid{grid-template-columns:1fr}}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--ink);padding:16px 18px;text-decoration:none;transition:border-color .15s,box-shadow .15s;display:block}.tool-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}.tool-card strong{color:var(--accent-dark);margin-bottom:4px;display:block}.tool-card span{color:var(--ink-soft);font-size:.9rem}.ad-slot{display:none}.site-footer{background:linear-gradient(135deg, var(--brand-dark), var(--brand-mid));color:var(--brand-tag);padding:32px 0;font-size:.88rem}.site-footer strong{color:#fff}.site-footer a{color:var(--brand-mint)}