:root{--ink:#0e1726;--muted:#5a6478;--line:#e4e9f2;--bg:#fff;--bg-soft:#f6f8fc;--accent:#1a56db;--accent-ink:#fff;--accent-soft:#eaf0ff;--ok:#0b7a4b;--warn:#a2550a;--radius:14px;--shadow:0 1px 2px #0f172a0a, 0 8px 24px #0f172a0f;--max:1120px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,Segoe UI,Inter,Roboto,Helvetica Neue,Arial,sans-serif;overflow-x:hidden}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{letter-spacing:-.02em;margin:0 0 .6em;line-height:1.25}h1{font-size:clamp(1.9rem,4vw,2.7rem)}h2{margin-top:1.6em;font-size:clamp(1.35rem,2.4vw,1.75rem)}h3{margin-top:1.4em;font-size:1.15rem}p{margin:0 0 1em}ul,ol{padding-left:1.2em}li{margin:.35em 0}.container{max-width:var(--max);margin:0 auto;padding:0 20px}.narrow{max-width:760px}.site-header{z-index:40;backdrop-filter:saturate(180%)blur(10px);border-bottom:1px solid var(--line);background:#ffffffeb;position:sticky;top:0}.header-inner{align-items:center;gap:24px;min-width:0;height:64px;display:flex}.brand{color:var(--ink);flex:none;align-items:center;gap:10px;font-size:1.05rem;font-weight:700;display:flex}.brand:hover{text-decoration:none}.brand-mark{background:linear-gradient(135deg, var(--accent), #4f8bff);color:#fff;border-radius:8px;place-items:center;width:26px;height:26px;font-size:13px;font-weight:800;display:grid}.nav{scrollbar-width:none;gap:4px;min-width:0;margin-left:auto;display:flex;overflow-x:auto}.nav::-webkit-scrollbar{display:none}.nav a{color:var(--muted);white-space:nowrap;border-radius:8px;padding:8px 12px;font-size:.94rem}.nav a:hover{color:var(--ink);background:var(--bg-soft);text-decoration:none}.nav a[aria-current=page]{color:var(--accent);background:var(--accent-soft)}.demo-banner{color:var(--warn);background:#fff7e6;border-bottom:1px solid #f2d9a8;padding:9px 0;font-size:.86rem}.demo-banner strong{font-weight:700}.hero{background:linear-gradient(180deg, var(--bg-soft), #fff);border-bottom:1px solid var(--line);padding:56px 0 24px}.hero h1{max-width:780px}.hero .lede{color:var(--muted);max-width:680px;font-size:1.12rem}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--accent);background:var(--accent-soft);border-radius:999px;margin-bottom:14px;padding:4px 10px;font-size:.78rem;display:inline-block}.hero-actions{flex-wrap:wrap;gap:12px;margin-top:22px;display:flex}.btn{border:1px solid var(--line);color:var(--ink);cursor:pointer;background:#fff;border-radius:10px;align-items:center;gap:8px;padding:11px 18px;font-size:.95rem;font-weight:600;transition:all .15s;display:inline-flex}.btn:hover{border-color:#c9d3e3;text-decoration:none;transform:translateY(-1px)}.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.btn-primary:hover{background:#1447b8;border-color:#1447b8}.grid{gap:16px;display:grid}.grid-3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.grid-4{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.card{border:1px solid var(--line);border-radius:var(--radius);color:inherit;background:#fff;padding:20px;transition:all .18s;display:block}.card:hover{box-shadow:var(--shadow);border-color:#d3dcec;text-decoration:none;transform:translateY(-2px)}.card h3{margin:0 0 6px;font-size:1.02rem}.card p{color:var(--muted);margin:0;font-size:.92rem}.card .meta{color:var(--muted);margin-top:12px;font-size:.82rem;display:block}.section{padding:48px 0}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:22px;display:flex}.section-head h2{margin:0}.section-head a{font-size:.9rem}.calc-card{border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;padding:24px}.calc-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.field{flex-direction:column;gap:6px;display:flex}.field label{color:var(--muted);font-size:.86rem;font-weight:600}.field input,.field select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:10px;width:100%;padding:11px 12px;font-size:.98rem}.field input:focus,.field select:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}.calc-actions{flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px;display:flex}.result{border-top:1px dashed var(--line);margin-top:22px;padding-top:20px;display:none}.result.is-visible{display:block}.result-row{border-bottom:1px solid var(--bg-soft);justify-content:space-between;padding:9px 0;font-size:.96rem;display:flex}.result-row span:first-child{color:var(--muted)}.result-total{border-bottom:none;padding-top:14px;font-size:1.25rem;font-weight:700}.result-note{color:var(--muted);margin-top:14px;font-size:.84rem}.table-wrap{border:1px solid var(--line);border-radius:var(--radius);overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:.94rem}th,td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:11px 14px}th{background:var(--bg-soft);text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-size:.82rem}tbody tr:last-child td{border-bottom:none}.prose{max-width:760px}.prose h2{margin-top:1.8em}.prose p,.prose li{color:#253046}.breadcrumbs{color:var(--muted);margin:24px 0 8px;font-size:.85rem}.breadcrumbs a{color:var(--muted)}.callout{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--bg-soft);border-radius:10px;margin:22px 0;padding:16px 18px;font-size:.94rem}.tag{background:var(--accent-soft);color:var(--accent);border-radius:999px;margin:0 6px 6px 0;padding:3px 9px;font-size:.78rem;font-weight:600;display:inline-block}.tag-ok{color:#0b7a4b;background:#e7f6ee}.tag-warn{color:#a2550a;background:#fff4e0}.site-footer{border-top:1px solid var(--line);background:var(--bg-soft);margin-top:64px}.footer-inner{grid-template-columns:1.4fr 1fr 1fr;gap:32px;padding:44px 0 28px;display:grid}.site-footer h4{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:12px;font-size:.82rem}.site-footer ul{margin:0;padding:0;list-style:none}.site-footer li{margin:7px 0;font-size:.92rem}.site-footer a{color:var(--muted)}.site-footer a:hover{color:var(--accent)}.footer-bottom{border-top:1px solid var(--line);color:var(--muted);flex-wrap:wrap;justify-content:space-between;gap:16px;padding:16px 0;font-size:.82rem;display:flex}@media (width<=760px){.calc-grid{grid-template-columns:1fr}.header-inner{gap:10px}.brand{font-size:.98rem}.nav a{padding:7px 8px;font-size:.84rem}.footer-inner{grid-template-columns:1fr;gap:24px}.hero{padding:36px 0 16px}}@media (width<=430px){.brand-name{display:none}.nav{margin-left:0}.nav a{padding:7px;font-size:.82rem}}
