:root{--bg: #ffffff;--surface: #f8f7f4;--card: #ffffff;--border: #e7e2d9;--text: #1c2321;--muted: #5c6660;--accent: #c2570b;--accent-dark: #9a4406;--accent-soft: #fdf1e3;--good: #177245;--radius: 14px;--maxw: 1080px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.6;font-size:16.5px}a{color:var(--accent-dark);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--border);background:#fff;position:sticky;top:0;z-index:20}.site-header .wrap{display:flex;align-items:center;gap:28px;height:60px}.logo{font-size:21px;font-weight:800;color:var(--text);letter-spacing:-.02em;display:flex;align-items:center;gap:8px}.logo:hover{text-decoration:none}.logo .bead{width:15px;height:15px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#f2a65a,var(--accent));display:inline-block;box-shadow:inset 0 0 0 2px #fff3}.logo em{font-style:normal;color:var(--accent)}.main-nav{display:flex;gap:20px;margin-left:auto}.main-nav a{color:var(--muted);font-weight:600;font-size:15px}.main-nav a:hover{color:var(--text);text-decoration:none}.hero{padding:44px 0 8px}h1{font-size:34px;line-height:1.2;letter-spacing:-.02em;margin:0 0 10px}h2{font-size:24px;letter-spacing:-.01em;margin:34px 0 12px}h3{font-size:18px;margin:22px 0 8px}.lede{color:var(--muted);font-size:18px;max-width:46em;margin:0 0 8px}.breadcrumb{font-size:13.5px;color:var(--muted);margin:18px 0 0}.breadcrumb a{color:var(--muted)}.calc-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin:22px 0 8px;box-shadow:0 1px 3px #1c23210d;display:grid;grid-template-columns:1fr 1fr;gap:28px}@media(max-width:760px){.calc-card{grid-template-columns:1fr}}.field{margin-bottom:15px}.field label{display:block;font-weight:600;font-size:14.5px;margin-bottom:5px}.field .hint{font-weight:400;color:var(--muted);font-size:13px}.input-row{display:flex;align-items:stretch}.input-row .prefix,.input-row .suffix{display:flex;align-items:center;padding:0 10px;background:var(--surface);border:1px solid var(--border);color:var(--muted);font-size:14.5px}.input-row .prefix{border-right:0;border-radius:9px 0 0 9px}.input-row .suffix{border-left:0;border-radius:0 9px 9px 0}.field input[type=number],.field input[type=text],.field input[type=date],.field select{width:100%;padding:9px 12px;font-size:16px;border:1px solid var(--border);border-radius:9px;background:#fff;color:var(--text);font-family:inherit}.input-row input{border-radius:0}.input-row input:first-child{border-radius:9px 0 0 9px}.input-row input:last-child{border-radius:0 9px 9px 0}.field input:focus,.field select:focus{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}.calc-btn{width:100%;padding:12px;font-size:16.5px;font-weight:700;color:#fff;border:0;background:var(--accent);border-radius:10px;cursor:pointer;margin-top:4px}.calc-btn:hover{background:var(--accent-dark)}.results{background:var(--surface);border-radius:10px;padding:18px 20px;align-self:start}.results h3{margin:0 0 10px;font-size:15px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.result-main{font-size:31px;font-weight:800;letter-spacing:-.02em;color:var(--accent-dark);line-height:1.15}.result-main-label{font-size:14px;color:var(--muted);margin-bottom:2px}.result-row{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-top:1px solid var(--border);font-size:15.5px}.result-row:first-of-type{margin-top:12px}.result-row .k{color:var(--muted)}.result-row .v{font-weight:700;text-align:right}.result-note{font-size:13.5px;color:var(--muted);margin-top:12px}.table-scroll{overflow-x:auto;margin:14px 0;border:1px solid var(--border);border-radius:10px}table.data{border-collapse:collapse;width:100%;font-size:14.5px}table.data th,table.data td{padding:8px 12px;text-align:right;border-bottom:1px solid var(--border);white-space:nowrap}table.data th{background:var(--surface);font-weight:700;text-align:right}table.data th:first-child,table.data td:first-child{text-align:left}table.data tr:last-child td{border-bottom:0}.content p{max-width:52em}.formula-box{background:var(--accent-soft);border:1px solid #f3ddc2;border-radius:10px;padding:14px 18px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:15px;overflow-x:auto;margin:12px 0}details.faq{border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin-bottom:10px;background:#fff}details.faq summary{font-weight:700;cursor:pointer;font-size:16px}details.faq p{margin:8px 0 2px;color:#333}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:18px 0 8px}.tool-tile{border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;background:#fff;display:block}.tool-tile:hover{border-color:var(--accent);text-decoration:none;box-shadow:0 2px 8px #c2570b14}.tool-tile .t{font-weight:700;color:var(--text);font-size:16.5px}.tool-tile .d{color:var(--muted);font-size:14px;margin-top:3px;line-height:1.45}.related{margin:30px 0 6px}.site-footer{border-top:1px solid var(--border);margin-top:56px;background:var(--surface)}.site-footer .wrap{padding-top:26px;padding-bottom:30px}.footer-links{display:flex;flex-wrap:wrap;gap:8px 22px;margin-bottom:12px}.footer-links a{color:var(--muted);font-size:14.5px;font-weight:600}.site-footer p{color:var(--muted);font-size:13.5px;max-width:60em;margin:6px 0}.error-msg{color:#b3261e;font-size:14px;margin-top:8px;min-height:1em}.share-row{margin-top:16px;padding-top:14px;border-top:1px solid var(--border);display:flex;align-items:center;gap:10px;flex-wrap:wrap}.share-label{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.share-btns{display:flex;gap:8px;flex-wrap:wrap}.share-btn{display:inline-flex;align-items:center;gap:7px;padding:6px 12px 6px 7px;font-size:13.5px;font-weight:600;font-family:inherit;color:var(--text);background:#fff;border:1px solid var(--border);border-radius:999px;cursor:pointer}.share-btn:hover{border-color:var(--accent);background:var(--accent-soft)}.share-badge{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;color:#fff;font-size:12px;font-weight:800;line-height:1}.badge-x{background:#000;font-size:11px}.badge-fb{background:#1877f2;font-size:14px}.badge-th{background:#000;font-size:13px}.share-hint{font-size:13px;color:var(--good);margin:8px 0 0;min-height:1em}