:root{
  --bg:#f6f8fb;--surface:#ffffff;--text:#111827;--muted:#5b677a;--border:#dce3ee;--primary:#2563eb;--primary-dark:#1d4ed8;--accent:#0f766e;--soft:#eaf2ff;--shadow:0 14px 38px rgba(15,23,42,.08);--radius:18px;--radius-sm:12px;--max:1160px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.container{max-width:var(--max);margin:0 auto;padding:0 20px}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.skip-link{position:absolute;left:-999px;top:10px;background:#fff;padding:10px;border:1px solid var(--border);z-index:99}.skip-link:focus{left:10px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.site-header{position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);z-index:20}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:72px}.brand{display:flex;align-items:center;gap:10px;color:var(--text)}.brand:hover{text-decoration:none}.brand-mark{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--primary);color:#fff;font-weight:800}.brand small{display:block;color:var(--muted);font-size:12px;margin-top:-3px}.main-nav{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}.main-nav a{color:#334155;padding:10px 12px;border-radius:999px;font-weight:600;font-size:14px}.main-nav a:hover{background:var(--soft);text-decoration:none}.hero{padding:58px 0 34px;background:linear-gradient(135deg,#eef5ff,#f7fbff 60%,#eaf7f4)}.hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:28px;align-items:center}.eyebrow{font-size:13px;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);font-weight:800}.hero h1,.page-hero h1{font-size:clamp(34px,5vw,58px);line-height:1.04;margin:10px 0 18px;letter-spacing:-.04em}.hero p,.page-hero p{font-size:18px;color:var(--muted);max-width:780px}.hero-card{background:#fff;padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}.stat-list{display:grid;gap:14px}.stat{display:flex;gap:12px;align-items:flex-start}.stat strong{display:block;font-size:24px;line-height:1}.stat span{color:var(--muted);font-size:14px}.site-search{display:flex;gap:10px;margin:24px 0 0;max-width:760px}.site-search input{flex:1;min-width:0;padding:15px 16px;border:1px solid var(--border);border-radius:999px;font-size:16px;background:#fff}.site-search button,.btn,button{border:0;border-radius:999px;background:var(--primary);color:#fff;font-weight:800;padding:13px 18px;cursor:pointer}.site-search button:hover,.btn:hover,button:hover{background:var(--primary-dark);text-decoration:none}.section{padding:42px 0}.section-header{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:20px}.section h2,.content-section h2{font-size:28px;letter-spacing:-.02em;line-height:1.15;margin:0 0 12px}.section p,.content-section p{color:var(--muted)}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.category-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.tool-card,.category-card,.info-card,.calculator-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 24px rgba(15,23,42,.04);padding:20px}.tool-card h3,.category-card h3{margin:0 0 8px;font-size:20px}.tool-card p,.category-card p{margin:0 0 14px;color:var(--muted);font-size:15px}.category-card .icon{display:inline-grid;place-items:center;width:42px;height:42px;background:var(--soft);color:var(--primary);border-radius:13px;font-weight:900;margin-bottom:14px}.text-link{font-weight:800}.page-hero{padding:38px 0 18px;background:#fff;border-bottom:1px solid var(--border)}.breadcrumbs{font-size:14px;color:var(--muted);margin-bottom:12px}.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0;padding:0}.breadcrumbs li:not(:last-child)::after{content:'›';margin-left:6px;color:#94a3b8}.main-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:26px;align-items:start}.sidebar{position:sticky;top:92px}.sidebar-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px}.sidebar-card h2{font-size:18px;margin:0 0 10px}.sidebar-card ul{margin:0;padding-left:18px}.calculator-card{box-shadow:var(--shadow);margin-bottom:24px}.calc-form{display:grid;gap:16px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.form-row{display:grid;gap:7px}.form-row label{font-weight:800}.form-row input,.form-row select{width:100%;border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 13px;font-size:16px;background:#fff}.form-help{color:var(--muted);font-size:13px}.button-row{display:flex;gap:10px;flex-wrap:wrap}.secondary-btn{background:#e2e8f0;color:#0f172a}.secondary-btn:hover{background:#cbd5e1}.result-box{display:none;background:#eff6ff;border:1px solid #bfdbfe;border-radius:var(--radius-sm);padding:16px;color:#172554}.result-box.show{display:block}.result-box strong{display:block;font-size:22px;margin-bottom:4px}.error-box{display:none;background:#fff1f2;border:1px solid #fecdd3;color:#9f1239;border-radius:var(--radius-sm);padding:13px}.error-box.show{display:block}.content-section{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:20px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;background:#f8fafc;border:1px dashed #cbd5e1;border-radius:var(--radius-sm);padding:14px;overflow:auto}.example-list{display:grid;gap:12px}.example{background:#f8fafc;border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px}.pill-list{display:flex;gap:10px;flex-wrap:wrap}.pill-list a{background:#eef2ff;border:1px solid #c7d2fe;color:#1e3a8a;padding:9px 12px;border-radius:999px;font-weight:800}.faq-list details{background:#f8fafc;border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;margin:10px 0}.faq-list summary{font-weight:800;cursor:pointer}.muted{color:var(--muted)}.planned-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}.planned-list span{background:#f8fafc;border:1px dashed var(--border);border-radius:999px;padding:9px 12px;color:#475569}.site-footer{background:#0f172a;color:#dbeafe;margin-top:48px;padding:40px 0 0}.site-footer a{color:#dbeafe}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:28px}.footer-brand{color:#fff}.footer-list{list-style:none;padding:0;margin:0;display:grid;gap:8px}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding:18px 20px;color:#94a3b8}.notice{padding:14px 16px;background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:var(--radius-sm)}.sitemap-columns{columns:2;column-gap:40px}.sitemap-columns ul{break-inside:avoid;margin-top:0}@media(max-width:900px){.hero-grid,.main-layout,.footer-grid{grid-template-columns:1fr}.category-grid,.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sidebar{position:static}.main-nav{display:none}.site-search{flex-direction:column}.site-search button{width:100%}}@media(max-width:620px){.container{padding:0 16px}.hero{padding-top:36px}.card-grid,.category-grid,.form-grid,.planned-list{grid-template-columns:1fr}.button-row button{width:100%}.sitemap-columns{columns:1}}