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.thickness-chip{background:rgba(255,255,255,.05);border-color:#334155;color:rgba(241,245,249,.75)}[data-theme="dark"] .thickness-chip:hover{border-color:#f59e0b;color:#f59e0b;background:rgba(245,158,11,.08)}[data-theme="dark"] .thickness-chip.active{background:#f59e0b;border-color:#f59e0b;color:#0f172a}[data-theme="dark"] .result-card{background:rgba(255,255,255,.05);border-color:#334155}[data-theme="dark"] .result-card-label{color:#64748b}[data-theme="dark"] .result-card-value{color:#f1f5f9}[data-theme="dark"] .result-card.highlighted{background:rgba(245,158,11,.12);border-color:rgba(245,158,11,.5)}[data-theme="dark"] .result-card.highlighted .result-card-value{color:var(--brand-amber,#f59e0b)}[data-theme="dark"] .result-placeholder{border-color:#334155;background:rgba(255,255,255,.03)}[data-theme="dark"] .result-placeholder p{color:#475569}[data-theme="dark"] .breakdown-bar{background:rgba(255,255,255,.04);border-color:#334155}[data-theme="dark"] .breakdown-bar-label{color:#64748b}[data-theme="dark"] .ref-table th,[data-theme="dark"] thead th{background:#1e293b;color:#f1f5f9;border-color:#334155}[data-theme="dark"] .ref-table td,[data-theme="dark"] td{color:#94a3b8;border-color:#334155}[data-theme="dark"] .question{background:#1e293b;border-color:#334155}[data-theme="dark"] .question>summary{color:#f1f5f9}[data-theme="dark"] .question>summary::after{color:#a78bfa}[data-theme="dark"] .section-dark{background:#0f172a}[data-theme="dark"] .formula-card{background:#1e293b;border-color:#334155}[data-theme="dark"] .formula-card h3,[data-theme="dark"] .formula-card p{color:#f1f5f9}[data-theme="dark"] .formula-code{background:#0f172a;color:#e2e8f0}[data-theme="dark"] .trust-bar{background:#1e293b;border-color:#334155}[data-theme="dark"] .trust-item{color:#94a3b8}[data-theme="dark"] .table-tabs{background:#1e293b}[data-theme="dark"] .table-tab{color:#64748b}[data-theme="dark"] .table-tab.active{color:var(--brand-amber,#f59e0b);border-bottom-color:var(--brand-amber,#f59e0b)}[data-theme="dark"] .dir-section-title{color:#94a3b8}[data-theme="dark"] .dir-card-title{color:#f1f5f9}[data-theme="dark"] .dir-card-desc{color:#64748b}[data-theme="dark"] .site-footer{background:#1e293b;border-color:#334155}[data-theme="dark"] .footer-label{color:#64748b}[data-theme="dark"] .footer-brand p,[data-theme="dark"] .footer-col ul a,[data-theme="dark"] .footer-bottom p,[data-theme="dark"] .footer-bottom-links a{color:#64748b}[data-theme="dark"] .footer-bottom{border-color:#334155}[data-theme="dark"] .bottom-sheet-pill{background:#334155}[data-theme="dark"] .bottom-sheet-primary{color:#f1f5f9}[data-theme="dark"] .bottom-sheet-cta{color:var(--brand-amber,#f59e0b)}@media(max-width:1023px){[data-theme="dark"] .calc-results.has-results{background:#1e293b;border-color:#334155}}:root{--bg-page:#F8FAFC;--surface:#FFFFFF;--surface-secondary:#F1F5F9;--surface-tertiary:#E2E8F0;--surface-dark:#0F172A;--surface-dark-card:#1E293B;--surface-dark-border:rgba(255,255,255,0.12);--primary-ink:#111827;--primary-text:#334155;--muted-text:#64748B;--subtle-text:#94A3B8;--text-inverse:#FFFFFF;--border:#E2E8F0;--border-hover:#CBD5E1;--border-focus:#2563EB;--accent-yellow:#F4B41A;--accent-hover:#D99A00;--accent-light:#FFF7D6;--brand-blue:#2563EB;--brand-blue-hover:#1D4ED8;--brand-blue-light:#EFF6FF;--success:#16A34A;--success-light:#DCFCE7;--danger:#DC2626;--danger-light:#FEE2E2;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--radius-pill:9999px;--shadow-xs:0 1px 2px rgba(0,0,0,0.04);--shadow-sm:0 1px 3px rgba(0,0,0,0.06),0 1px 2px rgba(0,0,0,0.04);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.07),0 2px 4px -2px rgba(0,0,0,0.04);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.08),0 4px 6px -4px rgba(0,0,0,0.03);--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.1),0 8px 10px -6px rgba(0,0,0,0.04);--font-sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;--font-mono:'JetBrains Mono','Roboto Mono',ui-monospace,SFMono-Regular,monospace;--max-width:1280px;--max-reading-width:1120px}*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{margin:0;padding:0;background-color:var(--bg-page);color:var(--primary-text);font-family:var(--font-sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{color:var(--primary-ink);font-weight:700;line-height:1.2;margin:0 0 1rem;letter-spacing:-0.025em}p{margin:0 0 1.25rem}a{color:var(--brand-blue);text-decoration:none;transition:color 0.15s ease}a:hover{color:var(--brand-blue-hover)}.font-mono,.result-card-value,.formula-code,.formula-inline,.code-num{font-family:var(--font-mono)!important;font-variant-numeric:tabular-nums}.container{max-width:var(--max-width);margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}.container-reading{max-width:var(--max-reading-width);margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}.section{padding-top:88px;padding-bottom:88px}.section-header{text-align:center;max-width:760px;margin:0 auto 3rem}.section-header .eyebrow{display:inline-flex;align-items:center;gap:6px;background:var(--brand-blue-light);color:var(--brand-blue);font-size:0.82rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;padding:4px 12px;border-radius:var(--radius-pill);margin-bottom:1rem}.section-header h2{font-size:clamp(28px,4vw,42px);margin-bottom:0.75rem}.section-header p{font-size:1.1rem;color:var(--muted-text);margin:0}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow 0.2s ease,border-color 0.2s ease}.site-header.is-scrolled{box-shadow:var(--shadow-sm)}.site-header .nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}.nav-logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:1.15rem;color:var(--primary-ink)!important;letter-spacing:-0.03em}.nav-logo-icon{width:32px;height:32px;background:var(--primary-ink);color:#FFFFFF;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem}.nav-logo-icon span{color:var(--accent-yellow)}.nav-logo-text span{color:var(--accent-yellow)}.desktop-nav{display:flex;align-items:center;gap:1.5rem}.desktop-nav>a,.desktop-nav details>summary{color:var(--primary-text);font-weight:600;font-size:0.92rem;padding:6px 10px;border-radius:var(--radius-sm);cursor:pointer;list-style:none;transition:color 0.15s ease,background 0.15s ease}.desktop-nav>a:hover,.desktop-nav details>summary:hover{color:var(--primary-ink);background:var(--surface-secondary)}.tool-menu{position:relative}.tool-menu summary::-webkit-details-marker{display:none}.tool-menu summary::after{content:'';display:inline-block;width:6px;height:6px;border-right:2px solid var(--muted-text);border-bottom:2px solid var(--muted-text);transform:rotate(45deg) translateY(-2px);margin-left:6px;transition:transform 0.2s ease}.tool-menu[open] summary::after{transform:rotate(-135deg) translateY(-2px)}.tool-menu-panel{position:absolute;top:calc(100%+14px);left:-120px;width:680px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:1.5rem;display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;z-index:1010;animation:dropdownIn 0.18s cubic-bezier(0.16,1,0.3,1)}@keyframes dropdownIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.tool-menu-panel strong{display:block;font-size:0.72rem;text-transform:uppercase;letter-spacing:0.08em;color:var(--muted-text);margin-bottom:0.65rem}.tool-menu-panel a{display:block;color:var(--primary-text);font-size:0.88rem;font-weight:500;padding:5px 0;transition:color 0.15s ease}.tool-menu-panel a:hover{color:var(--brand-blue)}.tool-menu-panel .menu-all{grid-column:1 / -1;border-top:1px solid var(--border);padding-top:1rem;font-weight:700;color:var(--brand-blue);display:flex;align-items:center;gap:6px}.nav-actions{display:flex;align-items:center;gap:0.75rem}.btn-nav-cta{background:var(--primary-ink);color:#FFFFFF!important;font-weight:600;font-size:0.88rem;padding:8px 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a:active{background:var(--surface-tertiary)}.hero-saas{padding:72px 0 60px;background:linear-gradient(180deg,#FFFFFF 0%,var(--bg-page) 100%);border-bottom:1px solid var(--border)}.hero-grid{display:grid;grid-template-columns:1.15fr 0.85fr;gap:3.5rem;align-items:center}.hero-content .eyebrow{display:inline-flex;align-items:center;gap:6px;background:var(--accent-light);color:#855300;border:1px solid rgba(244,180,26,0.4);font-size:0.82rem;font-weight:700;letter-spacing:0.04em;padding:5px 14px;border-radius:var(--radius-pill);margin-bottom:1.25rem}.hero-content h1{font-size:clamp(34px,4.5vw,56px);font-weight:800;line-height:1.12;letter-spacing:-0.035em;color:var(--primary-ink);margin-bottom:1.25rem}.hero-content .hero-desc{font-size:1.15rem;line-height:1.6;color:var(--muted-text);margin-bottom:2rem;max-width:580px}.hero-actions{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-bottom:2rem}.btn-primary,.calc-btn{background:var(--accent-yellow)!important;color:#111827!important;font-weight:700!important;font-size:1rem!important;padding:0.85rem 1.85rem!important;min-height:48px!important;border:1px solid rgba(0,0,0,0.06)!important;border-radius:var(--radius-md)!important;cursor:pointer;box-shadow:0 1px 2px rgba(0,0,0,0.05),inset 0 1px 0 rgba(255,255,255,0.35);display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;transition:background 0.15s ease,transform 0.1s ease,box-shadow 0.15s ease}.btn-primary:hover,.calc-btn:hover{background:var(--accent-hover)!important;box-shadow:var(--shadow-sm)}.btn-primary:active,.calc-btn:active{transform:translateY(1px)}.btn-secondary{background:var(--surface)!important;color:var(--primary-ink)!important;font-weight:600!important;font-size:0.95rem!important;padding:0.85rem 1.5rem!important;min-height:48px!important;border:1px solid var(--border)!important;border-radius:var(--radius-md)!important;cursor:pointer;box-shadow:var(--shadow-xs);display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;transition:background 0.15s ease,border-color 0.15s ease}.btn-secondary:hover{background:var(--surface-secondary)!important;border-color:var(--border-hover)!important}.reset-btn{background:var(--surface)!important;color:var(--muted-text)!important;font-weight:600!important;font-size:0.92rem!important;padding:0.85rem 1.25rem!important;min-height:48px!important;border:1px solid var(--border)!important;border-radius:var(--radius-md)!important;cursor:pointer;transition:all 0.15s ease}.reset-btn:hover{color:var(--danger)!important;border-color:#FCA5A5!important;background:var(--danger-light)!important}.trust-checks{display:flex;align-items:center;gap:1.5rem;flex-wrap:wrap;font-size:0.88rem;font-weight:600;color:var(--muted-text)}.trust-check-item{display:flex;align-items:center;gap:6px}.trust-check-item svg{color:var(--success);width:16px;height:16px}.hero-preview-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);padding:1.75rem}.preview-card-header{display:flex;align-items:center;justify-content:space-between;padding-bottom:1rem;border-bottom:1px solid var(--border);margin-bottom:1.25rem}.preview-card-title{font-size:0.82rem;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;color:var(--muted-text)}.preview-pill-live{display:inline-flex;align-items:center;gap:6px;font-size:0.75rem;font-weight:700;color:var(--success);background:var(--success-light);padding:3px 10px;border-radius:var(--radius-pill)}.preview-pill-live::before{content:'';width:6px;height:6px;background:var(--success);border-radius:50%}.preview-inputs-mini{display:grid;grid-template-columns:repeat(3,1fr);gap:0.75rem;margin-bottom:1.25rem}.preview-input-box{background:var(--surface-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0.5rem 0.75rem}.preview-input-label{font-size:0.72rem;font-weight:600;color:var(--muted-text)}.preview-input-val{font-family:var(--font-mono);font-size:0.95rem;font-weight:700;color:var(--primary-ink)}.preview-result-hero{background:var(--surface-dark);color:#FFFFFF;border-radius:var(--radius-lg);padding:1.25rem 1.5rem;margin-bottom:1rem}.preview-res-label{font-size:0.75rem;text-transform:uppercase;letter-spacing:0.08em;color:var(--subtle-text);font-weight:600}.preview-res-number{font-family:var(--font-mono);font-size:2.2rem;font-weight:800;color:var(--accent-yellow);line-height:1.1;margin:4px 0}.preview-res-sub{font-size:0.8rem;color:var(--subtle-text)}.preview-breakdown{display:flex;height:8px;border-radius:var(--radius-pill);overflow:hidden;margin-bottom:0.5rem}.preview-bar-bit{background:var(--accent-yellow);width:5.5%}.preview-bar-agg{background:var(--primary-text);width:94.5%}.preview-breakdown-labels{display:flex;justify-content:space-between;font-size:0.75rem;font-weight:600;color:var(--muted-text)}.trust-strip{background:var(--surface);border-bottom:1px solid var(--border);padding:20px 0}.trust-metrics-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1.5rem;align-items:center}.trust-metric-item{display:flex;align-items:center;gap:12px}.trust-metric-icon{width:36px;height:36px;border-radius:var(--radius-md);background:var(--surface-secondary);display:flex;align-items:center;justify-content:center;color:var(--primary-ink);flex-shrink:0}.trust-metric-val{font-weight:800;font-size:1rem;color:var(--primary-ink);line-height:1.2}.trust-metric-lbl{font-size:0.78rem;color:var(--muted-text)}.calc-section{padding:64px 0 80px}.calc-wrap{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);overflow:hidden}.calc-tabs-header{padding:1.25rem 1.75rem 0.75rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem}.calc-tabs{background:var(--surface-secondary);padding:4px;border-radius:var(--radius-md);display:inline-flex;gap:4px}.calc-tab{background:transparent;border:none;padding:8px 18px;font-weight:600;font-size:0.88rem;color:var(--muted-text);border-radius:var(--radius-sm);cursor:pointer;transition:all 0.15s ease}.calc-tab.active{background:var(--surface);color:var(--primary-ink);font-weight:700;box-shadow:var(--shadow-xs)}.formula-bar-container{padding:1.25rem 1.75rem 0}.formula-bar-wrap{background:var(--surface-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1rem 1.25rem}.formula-bar-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.75rem;margin-bottom:0.75rem}.formula-bar-title{font-size:0.8rem;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;color:var(--muted-text);display:flex;align-items:center;gap:6px}.formula-step-chips{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}.formula-step-chips::-webkit-scrollbar{display:none}.formula-step-chip{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-pill);color:var(--muted-text);font-size:0.78rem;font-weight:600;padding:5px 12px;cursor:pointer;white-space:nowrap;transition:all 0.15s ease}.formula-step-chip:hover{color:var(--primary-ink);border-color:var(--border-hover)}.formula-step-chip.active{background:var(--primary-ink);color:#FFFFFF!important;border-color:var(--primary-ink)}.formula-screen-box{background:var(--surface-dark);color:#FFFFFF;border-radius:var(--radius-md);padding:0.85rem 1.15rem;display:flex;flex-direction:column;gap:0.4rem}.formula-eq-line{font-family:var(--font-mono);font-size:0.92rem;color:var(--subtle-text)}.formula-eq-line .formula-res{color:#34D399;font-weight:700}.formula-eq-line .formula-var{color:#38BDF8;font-weight:600}.formula-eq-line .formula-op{color:var(--accent-yellow);font-weight:700}.formula-live-sub{font-family:var(--font-mono);font-size:0.88rem;background:rgba(255,255,255,0.06);padding:0.45rem 0.85rem;border-radius:var(--radius-sm);border-left:3px solid var(--accent-yellow);color:#E2E8F0;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.formula-live-sub .sub-accent{color:#FDE047;font-weight:700}.formula-live-sub .sub-res{color:#4ADE80;font-weight:700}.calc-body{display:grid;grid-template-columns:1.15fr 0.85fr;gap:2rem;padding:1.75rem;align-items:start}.calc-inputs{display:flex;flex-direction:column;gap:1.75rem}.input-set{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem}.input-set-title{font-size:0.82rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--muted-text);margin-bottom:1.25rem;display:flex;align-items:center;gap:8px}.field{margin-bottom:1.25rem}.field:last-child{margin-bottom:0}.field label{display:block;font-size:0.92rem;font-weight:600;color:var(--primary-ink);margin-bottom:0.4rem}.field-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}@media (max-width:640px){.field-grid-2{grid-template-columns:1fr}}.input-row{display:flex!important;position:relative;width:100%}.input-row input{flex:1 1 auto!important;min-width:0!important;border:1px solid var(--border)!important;border-right:none!important;border-top-left-radius:8px!important;border-bottom-left-radius:8px!important;border-top-right-radius:0!important;border-bottom-right-radius:0!important;background:var(--surface)!important;color:var(--primary-ink)!important;font-family:var(--font-mono)!important;font-size:1rem!important;font-weight:600!important;padding:0.75rem 1rem!important;min-height:48px!important;transition:border-color 0.15s ease,box-shadow 0.15s ease!important}.input-row input:focus{outline:none!important;border-color:var(--border-focus)!important;box-shadow:0 0 0 3px rgba(37,99,235,0.15)!important;z-index:2}.input-row .unit-select,.unit-select{flex:0 0 90px!important;width:90px!important;min-width:90px!important;border:1px solid var(--border)!important;border-left:1px solid var(--border)!important;border-top-right-radius:8px!important;border-bottom-right-radius:8px!important;border-top-left-radius:0!important;border-bottom-left-radius:0!important;background-color:#F1F5F9!important;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2364748B' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")!important;background-repeat:no-repeat!important;background-position:right 10px center!important;background-size:10px 6px!important;color:var(--primary-ink)!important;font-family:var(--font-sans)!important;font-size:0.9rem!important;font-weight:700!important;padding:0.75rem 26px 0.75rem 0.75rem!important;min-height:48px!important;cursor:pointer!important;appearance:none!important;-webkit-appearance:none!important;-moz-appearance:none!important;transition:border-color 0.15s ease,background-color 0.15s ease!important}.input-row .unit-select:focus,.unit-select:focus{outline:none!important;border-color:var(--border-focus)!important;box-shadow:0 0 0 3px rgba(37,99,235,0.15)!important;z-index:2}.calc-inputs select:not(.unit-select){width:100%!important;border:1px solid var(--border)!important;border-radius:8px!important;background-color:var(--surface)!important;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2364748B' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")!important;background-repeat:no-repeat!important;background-position:right 14px center!important;background-size:10px 6px!important;color:var(--primary-ink)!important;font-size:0.95rem!important;font-weight:600!important;padding:0.75rem 36px 0.75rem 1rem!important;min-height:48px!important;cursor:pointer!important;appearance:none!important;-webkit-appearance:none!important;-moz-appearance:none!important}.calc-inputs input[type=text]:not(.input-row input){width:100%!important;border:1px solid var(--border)!important;border-radius:8px!important;background:var(--surface)!important;color:var(--primary-ink)!important;font-family:var(--font-mono)!important;font-size:1rem!important;font-weight:600!important;padding:0.75rem 1rem!important;min-height:48px!important}.estimate-tools{display:flex!important;flex-wrap:wrap!important;align-items:center!important;gap:8px 10px!important;background:#F8FAFC!important;border:1px solid #E2E8F0!important;border-radius:10px!important;padding:10px 14px!important;margin-bottom:20px!important}.estimate-tools .tools-label{font-size:11px!important;font-weight:700!important;text-transform:uppercase!important;letter-spacing:0.08em!important;color:#64748B!important;margin-right:2px!important;white-space:nowrap!important}.estimate-tools button[data-system]{background:#FFFFFF!important;border:1px solid #CBD5E1!important;border-radius:6px!important;color:#334155!important;font-size:13px!important;font-weight:600!important;padding:6px 14px!important;min-height:34px!important;cursor:pointer!important;transition:all 150ms ease!important}.estimate-tools button[data-system]:hover{background:#F1F5F9!important;border-color:#94A3B8!important;color:#0F172A!important}.estimate-tools button[data-system][aria-pressed="true"]{background:#0F172A!important;border-color:#0F172A!important;color:#FFFFFF!important;font-weight:700!important;box-shadow:0 1px 3px rgba(0,0,0,0.12)!important}.estimate-tools button[data-example]{background:#FFFFFF!important;border:1px dashed #CBD5E1!important;border-radius:6px!important;color:#475569!important;font-size:13px!important;font-weight:500!important;padding:6px 12px!important;min-height:34px!important;cursor:pointer!important;transition:all 150ms ease!important}.estimate-tools button[data-example]:hover{background:#EFF6FF!important;border-color:#3B82F6!important;border-style:solid!important;color:#1D4ED8!important}.thickness-chips{display:grid!important;grid-template-columns:repeat(4,1fr)!important;gap:8px!important;margin-top:0.6rem!important;width:100%!important}.thickness-chip{background:#FFFFFF!important;border:1px solid #CBD5E1!important;border-radius:6px!important;color:#334155!important;font-family:var(--font-sans)!important;font-size:13px!important;font-weight:600!important;padding:0 6px!important;height:38px!important;min-height:38px!important;cursor:pointer!important;transition:all 0.15s ease!important;display:inline-flex!important;align-items:center!important;justify-content:center!important;text-align:center!important}.thickness-chip:hover{background:#F1F5F9!important;border-color:#94A3B8!important;color:#0F172A!important}.thickness-chip.active{background:#0F172A!important;color:#FFFFFF!important;border-color:#0F172A!important;font-weight:700!important;box-shadow:0 1px 3px rgba(0,0,0,0.15)!important}.field-hint{font-size:0.78rem!important;color:var(--muted-text)!important;margin-top:0.4rem!important}.planning-options{flex:0 0 100%!important;width:100%!important;border:1px solid #E2E8F0!important;border-radius:8px!important;background:#F8FAFC!important;margin-bottom:8px!important;overflow:hidden!important;transition:all 150ms ease!important}.planning-options summary{padding:10px 14px!important;font-size:13px!important;font-weight:600!important;color:#475569!important;cursor:pointer!important;user-select:none!important;list-style:none!important;display:flex!important;align-items:center!important;gap:8px!important}.planning-options summary::-webkit-details-marker{display:none!important}.planning-options summary::before{content:"▶"!important;font-size:10px!important;color:#94A3B8!important;transition:transform 150ms ease!important}.planning-options[open] summary::before{transform:rotate(90deg)!important}.planning-options summary:hover{color:#0F172A!important;background:#F1F5F9!important}.planning-options[open]{background:#FFFFFF!important;border-color:#CBD5E1!important}.planning-options[open] summary{border-bottom:1px solid #E2E8F0!important;color:#0F172A!important}.planning-fields{display:grid!important;grid-template-columns:1fr 1fr!important;gap:14px!important;padding:14px!important}@media (max-width:640px){.planning-fields{grid-template-columns:1fr!important}}.calc-actions-row{display:flex!important;flex-wrap:wrap!important;gap:12px!important;width:100%!important;align-items:center!important}.calc-actions-row .calc-btn{flex:1 1 200px!important;min-height:48px!important;background:#F4B41A!important;color:#111827!important;font-weight:700!important;font-size:0.95rem!important;border-radius:8px!important;border:none!important;cursor:pointer!important;display:inline-flex!important;align-items:center!important;justify-content:center!important;gap:8px!important;box-shadow:0 2px 6px rgba(244,180,26,0.25)!important;transition:all 150ms ease!important}.calc-actions-row .calc-btn:hover{background:#D99A00!important;transform:translateY(-1px)!important;box-shadow:0 4px 12px rgba(244,180,26,0.35)!important}.calc-actions-row .reset-btn{flex:0 0 auto!important;min-height:48px!important;padding:0 18px!important;background:#FFFFFF!important;border:1px solid #CBD5E1!important;border-radius:8px!important;color:#64748B!important;font-weight:600!important;font-size:0.9rem!important;cursor:pointer!important;transition:all 150ms ease!important}.calc-actions-row .reset-btn:hover{background:#FEF2F2!important;border-color:#FECACA!important;color:#DC2626!important}.calc-results{background:var(--surface-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;display:flex;flex-direction:column;gap:1.25rem}.results-header h3{font-size:0.82rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--muted-text);margin:0}.result-placeholder{padding:3rem 1.5rem;text-align:center;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius-md)}.result-placeholder-icon{width:44px;height:44px;margin:0 auto 0.75rem;color:var(--subtle-text)}.result-card.highlighted{background:var(--surface);border:2px solid var(--primary-ink);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm)}.result-card.highlighted .result-card-label{font-size:0.8rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--muted-text)}.result-card.highlighted .result-card-value{font-family:var(--font-mono);font-size:clamp(2.4rem,4vw,3.2rem);font-weight:800;color:var(--primary-ink);line-height:1.1;margin:6px 0}.result-card.highlighted .result-card-sub{font-size:0.85rem;color:var(--muted-text)}.result-grid-2x2{display:grid;grid-template-columns:1fr 1fr;gap:0.85rem}.result-card:not(.highlighted){background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:1rem 1.15rem}.result-card-label{font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:0.06em;color:var(--muted-text);margin-bottom:4px}.result-card-value{font-family:var(--font-mono);font-size:1.35rem;font-weight:700;color:var(--primary-ink)}.result-card-sub{font-size:0.78rem;color:var(--muted-text)}.breakdown-bar{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:1rem 1.15rem}.breakdown-track{height:12px;background:var(--surface-dark-card);border-radius:var(--radius-pill);overflow:hidden;margin-top:6px;display:flex}.breakdown-fill-bitumen{background:var(--accent-yellow);height:100%;transition:width 0.3s ease}.calc-actions{display:flex;flex-wrap:wrap;gap:0.5rem;margin-top:0.5rem}.calc-action{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:8px 14px;font-size:0.82rem;font-weight:600;color:var(--primary-text);cursor:pointer;transition:all 0.15s ease}.calc-action:hover{border-color:var(--border-hover);color:var(--primary-ink);background:var(--surface-secondary)}.bottom-sheet-handle{width:100%!important;background:var(--surface)!important;border:1px solid var(--border)!important;border-radius:var(--radius-md)!important;box-shadow:var(--shadow-sm)!important;padding:0.85rem 1.15rem!important;cursor:pointer!important;text-align:left!important;margin-bottom:1rem!important}.bottom-sheet-peek{display:flex!important;align-items:center!important;justify-content:space-between!important}.bottom-sheet-primary{font-family:var(--font-mono)!important;font-size:1.35rem!important;font-weight:800!important;color:var(--primary-ink)!important}.bottom-sheet-cta{background:var(--accent-yellow)!important;color:#111827!important;padding:0.45rem 0.95rem!important;border-radius:var(--radius-pill)!important;font-size:0.8rem!important;font-weight:700!important}.how-it-works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;position:relative}.step-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:2rem;position:relative;transition:transform 0.2s ease,box-shadow 0.2s ease}.step-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.step-badge{width:40px;height:40px;background:var(--primary-ink);color:#FFFFFF;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem;margin-bottom:1.25rem}.step-card h3{font-size:1.25rem;margin-bottom:0.75rem}.step-card p{color:var(--muted-text);font-size:0.95rem;margin:0}.popular-calc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;text-decoration:none;display:flex;flex-direction:column;justify-content:space-between;transition:all 0.2s ease}.tool-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.tool-card-category{font-size:0.75rem;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;color:var(--brand-blue);margin-bottom:0.5rem}.tool-card h3{font-size:1.2rem;color:var(--primary-ink);margin-bottom:0.5rem}.tool-card p{font-size:0.92rem;color:var(--muted-text);margin-bottom:1.25rem;line-height:1.5}.tool-card-footer{font-size:0.88rem;font-weight:600;color:var(--brand-blue);display:flex;align-items:center;gap:6px}.bento-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}.bento-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;transition:all 0.2s ease}.bento-item:hover{box-shadow:var(--shadow-md)}.bento-icon{width:44px;height:44px;border-radius:var(--radius-md);background:var(--surface-secondary);color:var(--primary-ink);display:flex;align-items:center;justify-content:center;margin-bottom:1rem}.bento-item h3{font-size:1.15rem;margin-bottom:0.5rem}.bento-item p{color:var(--muted-text);font-size:0.92rem;margin:0;line-height:1.55}.dark-methodology-section{background:var(--surface-dark);color:#FFFFFF;padding:88px 0}.dark-methodology-section h2{color:#FFFFFF}.dark-methodology-section p{color:var(--subtle-text)}.dark-methodology-section .eyebrow{background:rgba(244,180,26,0.15);color:var(--accent-yellow)}.formula-cards-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem;margin-bottom:2.5rem}.formula-card-dark{background:var(--surface-dark-card);border:1px solid var(--surface-dark-border);border-radius:var(--radius-lg);padding:1.75rem}.formula-card-dark h3{color:#FFFFFF;font-size:1.15rem;margin-bottom:0.75rem}.formula-box-dark{background:#0B132B;border-radius:var(--radius-sm);padding:0.85rem 1.15rem;font-family:var(--font-mono);font-size:0.95rem;color:var(--accent-yellow);font-weight:600;margin-bottom:0.85rem;border-left:3px solid var(--accent-yellow)}.formula-card-dark p{color:var(--subtle-text);font-size:0.9rem;margin:0;line-height:1.55}.transparency-block{background:rgba(255,255,255,0.05);border:1px solid var(--surface-dark-border);border-radius:var(--radius-lg);padding:1.5rem 2rem;display:flex;align-items:center;gap:1.5rem}.transparency-icon{width:44px;height:44px;background:rgba(244,180,26,0.2);color:var(--accent-yellow);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.transparency-text h4{color:#FFFFFF;font-size:1rem;margin:0 0 4px}.transparency-text p{color:var(--subtle-text);font-size:0.9rem;margin:0}.table-tabs-wrap{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:1.75rem;box-shadow:var(--shadow-sm)}.table-tabs{display:flex;gap:6px;border-bottom:1px solid var(--border);padding-bottom:1rem;margin-bottom:1.5rem;overflow-x:auto}.table-tab{background:var(--surface-secondary);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--primary-text);font-size:0.9rem;font-weight:600;padding:8px 18px;cursor:pointer;white-space:nowrap;transition:all 0.15s ease}.table-tab:hover{background:var(--surface-tertiary)}.table-tab.active{background:var(--primary-ink);color:#FFFFFF;border-color:var(--primary-ink)}.table-panel{display:none;overflow-x:auto}.table-panel.active{display:block}.ref-table{width:100%;border-collapse:collapse;font-size:0.92rem;text-align:left}.ref-table th{background:var(--surface-secondary);color:var(--primary-ink);font-weight:700;padding:12px 16px;border-bottom:2px solid var(--border);white-space:nowrap}.ref-table td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--primary-text)}.ref-table tr:hover td{background:var(--bg-page)}.ref-table td.highlight{font-weight:700;color:var(--brand-blue);font-family:var(--font-mono)}.regional-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}.regional-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;text-decoration:none;transition:all 0.2s ease;display:flex;flex-direction:column;justify-content:space-between}.regional-card:hover{box-shadow:var(--shadow-md);border-color:var(--border-hover);transform:translateY(-2px)}.regional-badge{font-size:0.75rem;font-weight:700;color:var(--brand-blue);text-transform:uppercase;letter-spacing:0.08em;margin-bottom:0.5rem}.regional-card h3{font-size:1.2rem;margin-bottom:0.5rem;color:var(--primary-ink)}.regional-card p{font-size:0.92rem;color:var(--muted-text);margin:0;line-height:1.5}.relationship-container{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:2.5rem;box-shadow:var(--shadow-sm)}.relationship-diagram{display:flex;align-items:center;justify-content:center;gap:1.5rem;flex-wrap:wrap;margin:2rem 0}.relation-box{background:var(--surface-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;text-align:center;min-width:180px}.relation-box.highlight-yellow{background:var(--accent-light);border-color:rgba(244,180,26,0.4)}.relation-box.highlight-dark{background:var(--surface-dark);color:#FFFFFF}.relation-box.highlight-dark h4,.relation-box.highlight-dark p{color:#FFFFFF}.relation-box h4{font-size:1.15rem;margin-bottom:4px}.relation-box p{font-size:0.85rem;color:var(--muted-text);margin:0}.relation-symbol{font-size:1.75rem;font-weight:800;color:var(--muted-text)}.faq-container{max-width:850px;margin:0 auto}.faq-item,.question{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:0.85rem;overflow:hidden;transition:border-color 0.15s ease}.faq-item:hover,.question:hover{border-color:var(--border-hover)}.faq-item summary,.question summary,.faq-q{padding:1.25rem 1.5rem;font-size:1.05rem;font-weight:700;color:var(--primary-ink);cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:1rem}.faq-item summary::-webkit-details-marker,.question summary::-webkit-details-marker{display:none}.faq-chevron{width:20px;height:20px;color:var(--muted-text);transition:transform 0.2s ease;flex-shrink:0}.faq-item[open] .faq-chevron,.question[open] .faq-chevron{transform:rotate(180deg)}.faq-answer,.question-answer{padding:0 1.5rem 1.25rem;color:var(--primary-text);font-size:0.95rem;line-height:1.65}.final-cta-card{background:var(--surface-dark);color:#FFFFFF;border-radius:var(--radius-xl);padding:3.5rem 2rem;text-align:center;margin-bottom:4rem}.final-cta-card h2{color:#FFFFFF;font-size:clamp(28px,4vw,42px);margin-bottom:1rem}.final-cta-card p{color:var(--subtle-text);font-size:1.15rem;max-width:600px;margin:0 auto 2rem}.final-cta-sub{font-size:0.85rem;color:var(--subtle-text);margin-top:1rem}.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:64px 0 32px}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:2.5rem;margin-bottom:3.5rem}.footer-brand p{color:var(--muted-text);font-size:0.92rem;line-height:1.6;max-width:320px;margin-top:0.75rem}.footer-col h4,.footer-col .footer-label{font-size:0.82rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--primary-ink);margin-bottom:1rem}.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:0.65rem}.footer-col a{color:var(--muted-text);font-size:0.92rem;transition:color 0.15s ease}.footer-col a:hover{color:var(--primary-ink)}.footer-bottom{border-top:1px solid var(--border);padding-top:1.75rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;font-size:0.85rem;color:var(--muted-text)}.footer-bottom-links{display:flex;gap:1.5rem}.footer-bottom-links a{color:var(--muted-text)}.footer-bottom-links a:hover{color:var(--primary-ink)}.scroll-top{position:fixed;bottom:24px;right:24px;width:44px;height:44px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);color:var(--primary-ink);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all 0.15s ease;z-index:900}.scroll-top:hover{background:var(--surface-secondary);border-color:var(--border-hover)}@media (max-width:1024px){.hero-grid{grid-template-columns:1fr;gap:2.5rem}.calc-body{grid-template-columns:1fr}.trust-metrics-grid{grid-template-columns:repeat(3,1fr)}.popular-calc-grid,.bento-grid,.regional-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1fr 1fr}}@media (max-width:900px){.desktop-nav{display:none!important}.nav-toggle{display:flex!important}.how-it-works-grid{grid-template-columns:1fr}}@media (max-width:768px){.section{padding-top:56px;padding-bottom:56px}.container,.container-reading{padding-left:16px;padding-right:16px}.trust-metrics-grid{grid-template-columns:1fr;gap:1rem}.popular-calc-grid,.bento-grid,.regional-grid,.formula-cards-grid{grid-template-columns:1fr}.calc-body{padding:1rem}.calc-inputs input,.calc-inputs select{font-size:16px!important;min-height:50px!important}.btn-primary,.btn-secondary,.calc-btn,.reset-btn{min-height:50px!important}.result-grid-2x2{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.transparency-block{flex-direction:column;text-align:center}}@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important}}.blog-hero{background:var(--surface);border-bottom:1px solid var(--border);padding:64px 0 44px;position:relative}.blog-hero-inner{max-width:820px;margin:0 auto;text-align:center}.blog-hero h1{font-size:clamp(2.2rem,4vw,3.2rem);font-weight:800;color:var(--primary-ink);line-height:1.15;margin:0.75rem 0 1rem}.blog-hero-desc{font-size:1.1rem;color:var(--primary-text);line-height:1.65;max-width:640px;margin:0 auto 2rem}.blog-metrics-strip{display:flex;justify-content:center;align-items:center;gap:28px;flex-wrap:wrap;padding-top:1.5rem;border-top:1px solid var(--border)}.blog-metric{display:flex;align-items:center;gap:8px;font-size:0.88rem;font-weight:600;color:var(--primary-text)}.blog-metric svg{color:var(--brand-amber-dark,#b45309);flex-shrink:0}.blog-controls-wrap{margin:2.5rem 0 2rem;display:flex;flex-direction:column;gap:16px}.blog-search-bar{position:relative;max-width:500px;margin:0 auto;width:100%}.blog-search-bar input{width:100%;padding:12px 16px 12px 42px;border:1px solid var(--border);border-radius:9999px;background:var(--surface);color:var(--primary-ink);font-size:0.95rem;box-shadow:var(--shadow-sm);transition:all 0.15s ease}.blog-search-bar input:focus{outline:none;border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(37,99,235,0.15)}.blog-search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--muted-text);pointer-events:none}.blog-filter-chips{display:flex;justify-content:center;align-items:center;gap:8px;flex-wrap:wrap}.blog-chip{padding:8px 18px;border-radius:9999px;background:var(--surface);border:1px solid var(--border);color:var(--primary-text);font-size:0.85rem;font-weight:600;cursor:pointer;transition:all 0.15s ease;user-select:none}.blog-chip:hover{background:var(--surface-secondary);border-color:var(--border-hover);color:var(--primary-ink)}.blog-chip.active{background:var(--primary-ink);color:#FFFFFF!important;border-color:var(--primary-ink);box-shadow:0 2px 8px rgba(17,24,39,0.15)}.featured-guide-section{margin-bottom:3.5rem}.featured-guide-card{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform 0.2s ease,box-shadow 0.2s ease,border-color 0.2s ease;text-decoration:none;color:inherit}.featured-guide-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--border-hover)}.featured-guide-media{position:relative;min-height:320px;overflow:hidden;background:var(--surface-secondary)}.featured-guide-media img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease}.featured-guide-card:hover .featured-guide-media img{transform:scale(1.03)}.featured-badge{position:absolute;top:16px;left:16px;background:#FEF3C7;color:#92400E;border:1px solid #FCD34D;border-radius:9999px;padding:5px 14px;font-size:0.75rem;font-weight:700;letter-spacing:0.04em;text-transform:uppercase;display:flex;align-items:center;gap:6px;box-shadow:0 2px 6px rgba(0,0,0,0.1)}.featured-guide-body{padding:2.5rem;display:flex;flex-direction:column;justify-content:center}.featured-guide-meta{display:flex;align-items:center;gap:12px;font-size:0.82rem;color:var(--muted-text);margin-bottom:0.75rem}.featured-category-pill{background:#EFF6FF;color:#1D4ED8;font-weight:700;font-size:0.75rem;padding:3px 10px;border-radius:9999px;text-transform:uppercase;letter-spacing:0.04em}.featured-guide-title{font-size:clamp(1.4rem,2.2vw,1.85rem);font-weight:800;color:var(--primary-ink);line-height:1.25;margin:0 0 1rem}.featured-guide-desc{font-size:0.98rem;color:var(--primary-text);line-height:1.65;margin:0 0 1.5rem}.featured-topics-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:1.75rem}.featured-topic-tag{background:var(--surface-secondary);color:var(--primary-text);font-size:0.78rem;font-weight:600;padding:4px 10px;border-radius:6px}.featured-guide-footer{display:flex;align-items:center;justify-content:space-between;padding-top:1.25rem;border-top:1px solid var(--border)}.featured-author{display:flex;align-items:center;gap:10px}.featured-author-avatar{width:36px;height:36px;border-radius:50%;background:var(--primary-ink);color:var(--accent-yellow,#F4B41A);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:0.85rem}.featured-author-name{font-size:0.88rem;font-weight:700;color:var(--primary-ink);line-height:1.2}.featured-author-role{font-size:0.75rem;color:var(--muted-text)}.featured-cta-link{font-size:0.92rem;font-weight:700;color:var(--primary-ink);display:inline-flex;align-items:center;gap:6px;transition:gap 0.15s ease}.featured-guide-card:hover .featured-cta-link{gap:10px;color:var(--brand-amber-dark,#b45309)}.blog-cards-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.article-entry-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-sm);transition:transform 0.2s ease,box-shadow 0.2s ease,border-color 0.2s ease;text-decoration:none;color:inherit}.article-entry-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--border-hover)}.article-entry-thumb{position:relative;aspect-ratio:16 / 9;width:100%;overflow:hidden;background:var(--surface-secondary)}.article-entry-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 0.35s ease}.article-entry-card:hover .article-entry-thumb img{transform:scale(1.04)}.article-category-badge{position:absolute;top:12px;left:12px;font-size:0.72rem;font-weight:700;letter-spacing:0.04em;text-transform:uppercase;padding:3px 10px;border-radius:9999px;background:rgba(17,24,39,0.85);color:#FFFFFF;backdrop-filter:blur(4px)}.article-entry-content{padding:1.5rem;display:flex;flex-direction:column;flex:1}.article-entry-meta{font-size:0.8rem;color:var(--muted-text);margin-bottom:0.5rem;display:flex;align-items:center;gap:8px}.article-entry-title{font-size:1.12rem;font-weight:700;color:var(--primary-ink);line-height:1.35;margin:0 0 0.65rem;transition:color 0.15s ease}.article-entry-card:hover .article-entry-title{color:var(--brand-amber-dark,#b45309)}.article-entry-excerpt{font-size:0.88rem;color:var(--primary-text);line-height:1.6;margin:0 0 1.25rem;flex:1}.article-entry-footer{display:flex;align-items:center;justify-content:space-between;padding-top:1rem;border-top:1px solid var(--border);font-size:0.82rem}.article-read-cta{font-weight:700;color:var(--primary-ink);display:inline-flex;align-items:center;gap:4px;transition:gap 0.15s ease}.article-entry-card:hover .article-read-cta{gap:8px;color:var(--brand-amber-dark,#b45309)}.blog-tools-section{background:var(--surface-secondary);padding:64px 0;border-top:1px solid var(--border);margin-top:4rem}.blog-tools-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.blog-tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;display:flex;align-items:flex-start;gap:1rem;text-decoration:none;color:inherit;box-shadow:var(--shadow-sm);transition:all 0.15s ease}.blog-tool-card:hover{transform:translateY(-2px);border-color:var(--border-hover);box-shadow:var(--shadow-md)}.blog-tool-icon{width:44px;height:44px;border-radius:10px;background:#EFF6FF;color:#2563EB;display:flex;align-items:center;justify-content:center;flex-shrink:0}.blog-tool-title{font-weight:700;font-size:0.95rem;color:var(--primary-ink);margin-bottom:0.25rem}.blog-tool-desc{font-size:0.82rem;color:var(--muted-text);line-height:1.5}@media (max-width:1024px){.featured-guide-card{grid-template-columns:1fr}.featured-guide-media{min-height:240px}.blog-cards-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.blog-tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:640px){.blog-hero{padding:40px 0 32px}.blog-metrics-strip{gap:14px;font-size:0.8rem}.blog-cards-grid{grid-template-columns:1fr}.blog-tools-grid{grid-template-columns:1fr}.featured-guide-body{padding:1.5rem}}.article-header-section{background:var(--surface);border-bottom:1px solid var(--border);padding:48px 0 36px}.article-header-inner{max-width:860px;margin:0 auto}.article-breadcrumb{display:flex;align-items:center;gap:8px;font-size:0.82rem;color:var(--muted-text);margin-bottom:1.25rem;flex-wrap:wrap}.article-breadcrumb a{color:var(--muted-text);text-decoration:none;transition:color 0.15s ease}.article-breadcrumb a:hover{color:var(--primary-ink)}.article-breadcrumb .sep{color:var(--border-strong,#cbd5e1)}.article-title{font-size:clamp(2rem,3.8vw,3rem);font-weight:800;color:var(--primary-ink);line-height:1.2;margin:0.75rem 0 1rem}.article-lead{font-size:1.15rem;color:var(--primary-text);line-height:1.65;margin-bottom:1.5rem}.article-meta-badges{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:1.5rem}.article-meta-badge{font-size:0.78rem;font-weight:700;padding:4px 12px;border-radius:9999px;background:var(--surface-secondary);color:var(--primary-text);border:1px solid var(--border)}.article-byline-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:1.25rem;border-top:1px solid var(--border);flex-wrap:wrap}.article-byline-author{display:flex;align-items:center;gap:12px}.article-byline-avatar{width:44px;height:44px;border-radius:50%;background:var(--primary-ink);color:var(--accent-yellow,#f4b41a);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem}.article-byline-name{font-size:0.95rem;font-weight:700;color:var(--primary-ink)}.article-byline-role{font-size:0.8rem;color:var(--muted-text)}.article-byline-dates{font-size:0.82rem;color:var(--muted-text);display:flex;align-items:center;gap:12px}.article-page-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:40px;align-items:start;padding-top:40px;padding-bottom:64px}.article-content-body{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:clamp(24px,4vw,44px);box-shadow:var(--shadow-sm);min-width:0}.article-content-body p{font-size:1.05rem;line-height:1.8;color:var(--primary-text);margin-bottom:1.5rem}.article-content-body h2{font-size:1.65rem;font-weight:800;color:var(--primary-ink);margin:2.5rem 0 1rem;padding-bottom:0.5rem;border-bottom:1px solid var(--border)}.article-content-body h2:first-of-type{margin-top:1rem}.article-content-body h3{font-size:1.25rem;font-weight:700;color:var(--primary-ink);margin:1.75rem 0 0.75rem}.article-content-body ul,.article-content-body ol{margin:1rem 0 1.5rem 1.5rem;color:var(--primary-text)}.article-content-body li{font-size:1.02rem;line-height:1.75;margin-bottom:0.5rem}.article-content-body strong{color:var(--primary-ink)}.article-hero-figure{margin:0 0 2.5rem;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border)}.article-hero-figure img{width:100%;height:auto;display:block}.article-hero-figure figcaption{background:var(--surface-secondary);color:var(--muted-text);font-size:0.85rem;padding:10px 18px;line-height:1.5;border-top:1px solid var(--border);display:flex;align-items:center;gap:8px}.engineering-formula-card{background:#0F172A;color:#FFFFFF;border-radius:var(--radius-lg);padding:1.5rem 1.75rem;margin:1.75rem 0 2rem;border-left:4px solid var(--accent-yellow,#F4B41A);box-shadow:0 4px 20px rgba(15,23,42,0.15)}.formula-card-badge{display:inline-flex;align-items:center;gap:6px;font-size:0.75rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--accent-yellow,#F4B41A);margin-bottom:0.75rem}.formula-steps-list{display:flex;flex-direction:column;gap:12px}.formula-step-row{display:flex;align-items:baseline;gap:12px;font-family:var(--font-mono);font-size:0.98rem;line-height:1.6;flex-wrap:wrap}.formula-step-num{background:rgba(244,180,26,0.18);color:var(--accent-yellow,#F4B41A);border:1px solid rgba(244,180,26,0.35);padding:2px 8px;border-radius:4px;font-size:0.78rem;font-weight:700;font-family:var(--font-sans);flex-shrink:0}.formula-math-text{color:#F8FAFC}.formula-math-text .math-var{color:#93C5FD;font-weight:600}.formula-math-text .math-op{color:var(--accent-yellow,#F4B41A);font-weight:700}.formula-math-text .math-res{color:#4ADE80;font-weight:700}.worked-case-card{background:#FFFBEB;border:1.5px solid #FDE68A;border-radius:var(--radius-lg);padding:1.75rem;margin:1.75rem 0 2rem}.worked-case-header{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.05rem;color:#92400E;margin-bottom:1rem}.worked-steps-box{display:flex;flex-direction:column;gap:10px;margin-bottom:1.25rem}.worked-step-item{display:flex;align-items:baseline;gap:12px;font-size:0.95rem;color:#78350F;line-height:1.5}.worked-step-circle{width:24px;height:24px;border-radius:50%;background:#F59E0B;color:#FFFFFF;display:flex;align-items:center;justify-content:center;font-size:0.78rem;font-weight:800;flex-shrink:0}.worked-breakdown-pills{display:flex;gap:10px;flex-wrap:wrap;padding-top:1rem;border-top:1px solid rgba(245,158,11,0.25)}.worked-pill{padding:6px 14px;border-radius:6px;font-size:0.85rem;font-weight:700}.worked-pill-binder{background:#FEF3C7;color:#B45309;border:1px solid #FCD34D}.worked-pill-agg{background:#E0F2FE;color:#0369A1;border:1px solid #BAE6FD}.pitfalls-card{background:#FFF1F2;border:1px solid #FECDD3;border-radius:var(--radius-lg);padding:1.5rem 1.75rem;margin:1.75rem 0 2rem}.pitfalls-title{display:flex;align-items:center;gap:8px;font-size:1rem;font-weight:800;color:#9F1239;margin-bottom:1rem}.pitfalls-list{list-style:none!important;padding:0!important;margin:0!important;display:flex;flex-direction:column;gap:10px}.pitfalls-list li{font-size:0.95rem!important;color:#881337!important;display:flex;align-items:flex-start;gap:10px;line-height:1.5;margin:0!important}.pitfalls-icon{color:#E11D48;flex-shrink:0;margin-top:2px}.article-sidebar{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}.sidebar-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm)}.sidebar-card h3{font-size:0.92rem;font-weight:800;text-transform:uppercase;letter-spacing:0.06em;color:var(--primary-ink);margin:0 0 1rem;display:flex;align-items:center;gap:8px}.sidebar-calc-cta{background:#F8FAFC;border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.5rem;text-align:center}.sidebar-calc-cta h4{font-size:1.05rem;font-weight:800;color:var(--primary-ink);margin:0 0 0.5rem}.sidebar-calc-cta p{font-size:0.85rem;color:var(--muted-text);margin-bottom:1.25rem;line-height:1.5}.sidebar-calc-cta .btn{width:100%}.sidebar-quick-specs{display:flex;flex-direction:column;gap:8px}.sidebar-spec-row{display:flex;justify-content:space-between;align-items:center;font-size:0.82rem;padding:6px 0;border-bottom:1px solid var(--border)}.sidebar-spec-row:last-child{border-bottom:none}.sidebar-spec-label{color:var(--muted-text)}.sidebar-spec-val{font-weight:700;color:var(--primary-ink);font-family:var(--font-mono)}.sidebar-tools-list{list-style:none!important;padding:0!important;margin:0!important;display:flex;flex-direction:column;gap:12px}.sidebar-tool-item a{display:block;font-size:0.9rem;font-weight:700;color:var(--primary-ink);text-decoration:none;transition:color 0.15s ease}.sidebar-tool-item a:hover{color:var(--brand-amber-dark,#b45309)}.sidebar-tool-item p{font-size:0.78rem;color:var(--muted-text);margin:2px 0 0;line-height:1.4}@media (max-width:1024px){.article-page-layout{grid-template-columns:1fr;gap:32px}.article-sidebar{position:static}}@media (max-width:640px){.article-header-section{padding:32px 0 24px}.article-title{font-size:1.75rem}.article-lead{font-size:1rem}.article-content-body{padding:20px 16px}.engineering-formula-card{padding:1.25rem 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#cbd5e1!important;display:flex!important;justify-content:space-between!important;align-items:center!important}.footer-left-col{display:flex!important;align-items:center!important;gap:6pt!important;flex:1!important}.footer-shield-icon{flex-shrink:0!important}.footer-notice-text{font-size:6.2pt!important;color:#64748b!important;line-height:1.35!important}.footer-right-col{text-align:right!important;font-size:6.8pt!important;line-height:1.35!important;padding:0 12pt!important;border-right:1pt solid #e2e8f0!important}.footer-suite-name{color:#0f172a!important}.footer-suite-status{color:#64748b!important}.footer-suite-url{color:#ea580c!important;font-weight:700!important}.footer-page-col{padding-left:12pt!important}.footer-page-num{font-size:8pt!important;font-weight:700!important;color:#475569!important;line-height:1.2!important;display:inline-block!important}@media print{@page{size:A4 portrait;margin:10mm 14mm 10mm 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