*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
    :root{
      --bg:#f7f9fc;--surface:#fff;--surface-2:#f9fafb;--surface-3:#eff6ff;
      --border:#e5e7eb;--text:#111827;--muted:#4b5563;--dim:#6b7280;--soft:#9ca3af;
      --accent:#2563eb;--accent-dark:#1d4ed8;--accent-soft:#e0ecff;
      --success:#16a34a;--success-soft:#dcfce7;
      --warning:#d97706;--warning-soft:#fef3c7;
      --danger:#dc2626;--danger-soft:#fee2e2;
      --purple:#7c3aed;--purple-soft:#ede9fe;
      --teal:#0f766e;--teal-soft:#ccfbf1;
      --radius:18px;--shadow:0 10px 30px rgba(15,23,42,.04);
      --sans:Inter,Arial,sans-serif
    }
    html{scroll-behavior:smooth;overflow-x:hidden}
    body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
    a{color:var(--accent);text-decoration:none}
    a:hover{text-decoration:underline}
    img,table,pre,iframe,video,canvas{max-width:100%}
    .hero,.article-hero,.hero-card,.content-card,.definition-card,.content-stack,.layout,.article-card,.sidebar,.sidebar-card,.related-card,.cta-block,.hub-cta,.calculator-callout,.formula-box,.table-wrap{max-width:100%;min-width:0}

    .site-header{background:rgba(255,255,255,.92);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:1000;backdrop-filter:blur(12px)}
    .nav-wrap{max-width:1120px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;font-size:18px;text-decoration:none}
    .brand:hover{text-decoration:none;color:var(--text)}
    .brand-mark{width:32px;height:32px;border-radius:10px;background:var(--accent);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800}
    .top-nav{display:flex;align-items:center;gap:18px;font-size:14px;font-weight:600}
    .top-nav a{color:var(--muted)}
    .top-nav a:hover{color:var(--accent);text-decoration:none}
    .menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px;color:var(--text);border-radius:8px;line-height:1}
    .mobile-nav{visibility:hidden;pointer-events:none;position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999}
    .mobile-nav.open{visibility:visible;pointer-events:auto}
    .mobile-nav-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,.5)}
    .mobile-nav-panel{position:absolute;top:0;right:0;width:280px;max-width:85vw;height:100%;background:#fff;box-shadow:-4px 0 24px rgba(15,23,42,.15);display:flex;flex-direction:column;overflow-y:auto;transform:translateX(100%);transition:transform .25s ease}
    .mobile-nav.open .mobile-nav-panel{transform:translateX(0)}
    .mobile-nav-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--border);background:#fff}
    .mobile-nav-head strong{font-weight:800;font-size:16px;color:var(--text)}
    .mobile-nav-close{background:none;border:none;cursor:pointer;color:var(--dim);padding:6px;border-radius:8px;line-height:1;font-size:22px}
    .mobile-nav-links{flex:1}
    .mobile-nav-links a{display:block;padding:15px 20px;font-size:15px;font-weight:600;color:var(--text);border-bottom:1px solid var(--border);text-decoration:none}
    .mobile-nav-links a:active{background:var(--surface-2)}
    .mobile-nav-footer{padding:16px 20px;border-top:1px solid var(--border);font-size:12px;color:var(--dim)}

    .main{max-width:1120px;margin:0 auto;padding:20px 20px 70px}
    .breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--dim);font-size:13px;margin-bottom:16px}
    .breadcrumb a{color:var(--dim);font-weight:600}
    .breadcrumb span:last-child{color:var(--text);font-weight:700}
    .hero-card{padding:22px 28px;position:relative;background:linear-gradient(135deg,#fff 0%,#eff6ff 100%);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;align-items:center;margin-bottom:20px}
    .eyebrow{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);background:var(--accent-soft);border-radius:999px;margin-bottom:10px}
    h1{font-size:clamp(26px,3.8vw,42px);line-height:1.1;max-width:100%;margin-bottom:10px;letter-spacing:-.03em}
    .hero-subtitle{font-size:15px;line-height:1.6;max-width:100%;color:var(--muted)}
    .hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:10px 14px;font-size:14px;font-weight:800;border:1px solid transparent;cursor:pointer;text-decoration:none;font-family:var(--sans)}
    .btn:hover{text-decoration:none}
    .btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
    .btn-primary:hover{background:var(--accent-dark);color:#fff}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--border)}
    .btn-secondary:hover{border-color:var(--accent);color:var(--accent)}
    .btn-muted{background:var(--surface-2);color:var(--text);border-color:var(--border)}

    .hero-search-panel{margin-top:14px;max-width:480px;position:relative;z-index:100}
    .hero-card .hero-search-panel{margin-top:0;max-width:100%}
    .hero-search-label{font-size:11.5px;font-weight:700;color:var(--muted);letter-spacing:.04em;text-transform:uppercase;margin-bottom:8px;display:block}
    .search-container{position:relative}
    .search-input-wrap{position:relative}
    .search-input{width:100%;padding:11px 14px 11px 40px;border-radius:12px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-size:14px;font-family:var(--sans);outline:none;transition:border-color .15s ease,background .15s ease}
    .search-input:focus{border-color:var(--accent);background:#fff}
    .search-input::placeholder{color:var(--soft)}
    .search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--soft);pointer-events:none}
    .search-dropdown{position:absolute;left:0;right:0;top:calc(100% + 6px);background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:0 20px 40px rgba(15,23,42,.18);max-height:300px;overflow-y:auto;z-index:9999}
    .search-dropdown.hidden{display:none}
    .search-results{padding:4px 0}
    .search-result{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;font-size:13.5px;color:var(--text);font-weight:600;border-bottom:1px solid var(--border);transition:background .1s ease;text-decoration:none;line-height:1.4}
    .search-result:last-child{border-bottom:0}
    .search-result:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}
    .search-cat{font-size:11px;font-weight:700;color:var(--dim);background:var(--surface-2);padding:2px 7px;border-radius:999px;white-space:nowrap;flex-shrink:0}
    .search-empty{padding:12px 14px;font-size:13.5px;color:var(--dim)}

    .layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px;align-items:start}
    .content-stack{display:flex;flex-direction:column;gap:18px}
    .calculator-card,.content-card,.sidebar-card,.cta-block{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;min-width:0;max-width:100%;overflow-wrap:break-word;word-wrap:break-word}
    .calculator-card h2,.content-card h2,.sidebar-card h2,.cta-block h2{font-size:22px;line-height:1.25;letter-spacing:-.02em;margin-bottom:10px}
    .content-card h3{font-size:17px;margin:16px 0 8px}
    .content-card p,.calculator-card p,.cta-block p{color:var(--muted);margin-bottom:12px}
    .calculator-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0}
    .field{display:flex;flex-direction:column;gap:6px;min-width:0}
    .field.full{grid-column:1/-1}
    label{font-weight:800;font-size:13px;color:var(--text)}
    input,select{width:100%;border:1px solid var(--border);border-radius:12px;padding:11px 12px;font-size:14px;color:var(--text);background:#fff;font-family:var(--sans);outline:none}
    input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
    .hint{font-size:12px;color:var(--dim);line-height:1.5}
    .button-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:8px}
    .results{display:none;margin-top:18px;border:1px solid var(--border);border-radius:16px;background:var(--surface-2);overflow:hidden}
    .results.show{display:block}
    .result-head{padding:18px;border-bottom:1px solid var(--border);background:#fff}
    .result-head strong{display:block;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--dim);margin-bottom:4px}
    .result-main{font-size:30px;line-height:1.15;font-weight:800;color:var(--accent)}
    .result-note{font-size:13px;color:var(--muted);margin-top:6px}
    .result-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--border)}
    .result-tile{background:#fff;padding:15px}
    .result-tile span{display:block;font-size:12px;font-weight:800;color:var(--dim);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px}
    .result-tile strong{font-size:19px;color:var(--text)}
    .warning-box{display:none;margin-top:14px;padding:12px 14px;border-radius:12px;border:1px solid #fcd34d;background:var(--warning-soft);color:#92400e;font-size:13.5px;font-weight:600}
    .info-box{padding:14px 16px;border-radius:14px;background:var(--surface-3);border:1px solid var(--accent-soft);color:var(--muted);font-size:14px;margin:14px 0}
    .info-box strong{color:var(--text)}
    .formula-box{background:#0f172a;color:#e5e7eb;padding:16px;border-radius:14px;overflow-x:auto;max-width:100%;margin:14px 0}
    .formula-box code{display:block;max-width:100%;white-space:pre;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;line-height:1.6}
    .table-wrap{width:100%;max-width:100%;overflow-x:auto;margin:14px 0;border:1px solid var(--border);border-radius:14px;background:#fff}
    table{width:100%;border-collapse:collapse;font-size:14px;min-width:640px}
    th,td{padding:11px 12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
    th{background:var(--surface-2);font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--dim);font-weight:800}
    tr:last-child td{border-bottom:0}
    .calculator-callout{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px;border:1px solid var(--accent-soft);background:var(--surface-3);border-radius:16px;overflow:hidden;margin:14px 0}
    .calculator-callout strong{display:block;margin-bottom:2px}
    .calculator-callout p{margin:0;color:var(--muted);font-size:14px}
    .pill-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
    .pill{display:inline-flex;padding:6px 10px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border);font-size:12px;font-weight:800;color:var(--muted)}
    .faq-item{border-top:1px solid var(--border);padding-top:14px;margin-top:14px}
    .faq-item h3{font-size:16px;margin-bottom:6px}
    .sidebar{position:sticky;top:88px;display:flex;flex-direction:column;gap:14px;min-width:0;max-width:100%}
    .toc{display:flex;flex-direction:column;gap:0}
    .toc a{display:block;padding:10px 0;color:var(--muted);font-size:14px;font-weight:700;border-bottom:1px solid var(--border)}
    .toc a:hover{color:var(--accent);text-decoration:none}
    .toc-select{display:none;width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:12px;background:#fff;color:var(--text);font-size:14px;font-weight:600;cursor:pointer}
    .sidebar-cta{background:linear-gradient(135deg,var(--accent) 0%,var(--purple) 100%);color:#fff}
    .sidebar-cta h2,.sidebar-cta p{color:#fff}
    .sidebar-cta .btn{background:#fff;color:var(--accent);width:100%}
    .quick-links-nav{display:flex;flex-direction:column;gap:0}
    .quick-links-nav a{display:block;padding:10px 0;font-size:14px;font-weight:600;color:var(--text);border-bottom:1px solid var(--border);text-decoration:none;line-height:1.4}
    .quick-links-nav a:last-child{border-bottom:0}
    .quick-links-nav a:hover{color:var(--accent);text-decoration:none}
    .quick-links-sidebar-mobile{display:none;padding:0 12px 24px;box-sizing:border-box;width:100%}

    .footer{border-top:1px solid var(--border);background:#fff;padding:40px 20px 24px;margin-top:40px}
    .footer-inner{max-width:1120px;margin:0 auto}
    .footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px;margin-bottom:32px}
    .footer-col h4{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--dim);margin-bottom:12px}
    .footer-col ul{list-style:none;display:flex;flex-direction:column;gap:8px}
    .footer-col ul li a{color:var(--muted);font-size:13px;font-weight:600;transition:color .12s ease}
    .footer-col ul li a:hover{color:var(--accent);text-decoration:none}
    .footer-base{border-top:1px solid var(--border);padding-top:20px;color:var(--dim);font-size:12px}

    @media(max-width:980px){
      .hero-card{grid-template-columns:1fr}
      .layout{display:flex;flex-direction:column}
      .sidebar{position:static;order:-1;width:100%}
      .toc{display:none}.toc-select{display:block}
      .quick-links-sidebar{display:none}.quick-links-sidebar-mobile{display:block}
      .result-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media(max-width:760px){
      .top-nav{display:none}.menu-btn{display:block}
      .main{padding:16px 12px 48px}
      .hero,.article-hero,.hero-card{padding:16px}
      .calculator-card,.content-card{padding:16px}.sidebar-card{padding:14px}.cta-block{padding:16px}
      h1{font-size:22px}h2{font-size:19px;margin-bottom:10px}h3{font-size:16px}.hero-subtitle{font-size:14px}
      .calculator-grid{grid-template-columns:1fr}
      .result-grid{grid-template-columns:1fr}
      .button-row{flex-direction:column}.btn{width:100%;box-sizing:border-box}
      .calculator-callout{display:block}.calculator-callout .btn{margin-top:12px;display:block;text-align:center}
      .hero-search-panel{max-width:100%}
      .cta-block p,.hub-cta p{max-width:100%}
      table{min-width:560px}
    }
    @media(max-width:420px){.footer-cols{grid-template-columns:1fr}}
    @media(max-width:760px){.footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}}