:root{--ink-950:#120929;--ink-900:#1e1040;--ink-800:#2e1a5e;--ink-700:#42326b;--ink-600:#5a4b80;--ink-500:#756799;--violet-700:#4c1d95;--violet-600:#6d28d9;--violet-500:#7c3aed;--violet-400:#9f67ff;--violet-100:#ede9fe;--violet-50:#f6f4ff;--gold-500:#f5b742;--gold-400:#fbcc68;--gold-900:#3d2800;--emerald-600:#059669;--emerald-50:#ecfdf5;--surface-paper:#ffffff;--surface-warm:#fcfbff;--surface-subtle:#f4f1fb;--border-hairline:#e4ddf4;--border-strong:#cfc2ee;--shadow-sm:0 2px 8px rgba(30, 16, 64, 0.05);--shadow-md:0 12px 32px -8px rgba(30, 16, 64, 0.10), 0 4px 12px -2px rgba(124, 58, 237, 0.06);--shadow-lg:0 24px 56px -12px rgba(30, 16, 64, 0.18), 0 8px 20px -4px rgba(124, 58, 237, 0.10);--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:26px;--font-sans:"Avenir Next", -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, sans-serif;--font-serif:"New York", "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;--font-mono:"SF Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace}*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.6;color:var(--ink-900);background-color:var(--surface-warm);-webkit-font-smoothing:antialiased}img,video{max-width:100%;height:auto;display:block}a{color:var(--violet-600);text-decoration:none;transition:color .15s ease}a:hover{color:var(--violet-700)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-100px;left:16px;z-index:1000;padding:10px 16px;background:var(--ink-900);color:#fff;border-radius:var(--radius-sm);font-weight:600}.skip-link:focus{top:12px}.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}.site-header{position:sticky;top:0;z-index:200;background:rgba(252,251,255,.88);backdrop-filter:saturate(180%)blur(16px);-webkit-backdrop-filter:saturate(180%)blur(16px);border-bottom:1px solid var(--border-hairline)}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:70px;gap:20px}.brand-link{display:inline-flex;align-items:center;gap:11px;color:var(--ink-900);font-weight:700;text-decoration:none}.brand-icon{border-radius:10px;box-shadow:0 2px 8px rgba(124,58,237,.22)}.brand-text{display:inline-flex;align-items:center;gap:7px}.brand-name{font-size:1.08rem;letter-spacing:-.02em;color:var(--ink-900)}.brand-link--footer .brand-name{color:#fff}.brand-badge{font-size:.72rem;font-weight:700;padding:2px 7px;border-radius:999px;background:var(--violet-100);color:var(--violet-700);letter-spacing:.02em}.site-nav{display:flex;align-items:center;gap:6px}.nav-link{display:inline-flex;align-items:center;gap:6px;padding:8px 13px;border-radius:var(--radius-sm);color:var(--ink-700);font-weight:600;font-size:.94rem;transition:background .15s ease,color .15s ease}.nav-link:hover{background:var(--violet-50);color:var(--ink-900)}.nav-count{font-size:.72rem;font-weight:700;padding:1px 6px;border-radius:999px;background:var(--violet-500);color:#fff}.nav-dropdown{position:relative}.mega-menu{position:absolute;top:calc(100% + 6px);left:-80px;width:920px;max-width:calc(100vw - 32px);background:var(--surface-paper);border:1px solid var(--border-strong);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:22px;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .18s ease,transform .18s ease,visibility .18s;pointer-events:none}.nav-dropdown:hover .mega-menu,.nav-dropdown:focus-within .mega-menu{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}.mega-menu-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.mega-col-title{font-size:.76rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--violet-600);margin-bottom:10px;padding-bottom:6px;border-bottom:1px solid var(--border-hairline)}.mega-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:3px}.mega-item{display:flex;align-items:baseline;gap:7px;padding:5px 7px;border-radius:6px;color:var(--ink-800);font-size:.84rem;line-height:1.3}.mega-item:hover{background:var(--violet-50);color:var(--violet-700)}.mega-abbr{font-weight:700;color:var(--ink-900);font-size:.78rem;min-width:44px}.mega-name{color:var(--ink-600);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mega-footer{margin-top:16px;padding-top:14px;border-top:1px solid var(--border-hairline);display:flex;align-items:center;justify-content:space-between;font-size:.85rem;color:var(--ink-600)}.mega-all-link{font-weight:700;color:var(--violet-600)}.header-actions{display:flex;align-items:center;gap:10px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font-sans);font-weight:700;font-size:.95rem;line-height:1.2;padding:12px 20px;border-radius:12px;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:transform .14s ease,box-shadow .14s ease,background .14s ease}.btn:hover{transform:translateY(-1px)}.btn-sm{padding:9px 15px;font-size:.86rem;border-radius:10px}.btn-lg{padding:14px 24px;font-size:1rem;border-radius:13px}.btn-block{width:100%}.btn-primary{background:linear-gradient(135deg,var(--violet-500) 0%,var(--violet-700) 100%);color:#fff;box-shadow:0 6px 18px rgba(109,40,217,.28)}.btn-primary:hover{color:#fff;box-shadow:0 8px 22px rgba(109,40,217,.36)}.btn-secondary{background:var(--surface-paper);color:var(--ink-900);border-color:var(--border-strong)}.btn-secondary:hover{background:var(--violet-50);color:var(--violet-700)}.btn-gold{background:var(--gold-500);color:var(--ink-950);box-shadow:0 6px 18px rgba(245,183,66,.25)}.btn-gold:hover{background:var(--gold-400);color:var(--ink-950)}.btn-ghost-light{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.22)}.btn-ghost-light:hover{background:rgba(255,255,255,.18);color:#fff}.mobile-menu-toggle{display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--border-strong);background:var(--surface-paper);padding:9px;cursor:pointer;flex-direction:column;justify-content:center;gap:5px}.mobile-menu-toggle span{display:block;width:100%;height:2px;background:var(--ink-900);border-radius:2px}.mobile-drawer{border-top:1px solid var(--border-hairline);background:var(--surface-paper);padding:18px 0 22px}.mobile-nav-links{display:flex;flex-direction:column;gap:10px;margin-bottom:16px}.mobile-nav-links a{font-weight:600;color:var(--ink-900);padding:8px 4px;border-bottom:1px solid var(--border-hairline)}.hero-section{position:relative;padding:52px 0 64px;background:radial-gradient(900px 440px at 88% 12%,rgba(124,58,237,.13),transparent 70%),radial-gradient(700px 380px at 10% 80%,rgba(245,183,66,.11),transparent 70%),linear-gradient(180deg,#f8f5ff 0%,var(--surface-warm) 100%);border-bottom:1px solid var(--border-hairline)}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start}.eyebrow-pill{display:inline-flex;align-items:center;gap:8px;padding:5px 13px;border-radius:999px;background:var(--violet-100);color:var(--violet-700);font-size:.82rem;font-weight:700;letter-spacing:.01em;margin-bottom:18px}.eyebrow-dot{width:8px;height:8px;border-radius:50%;background:var(--violet-500);box-shadow:0 0 0 3px rgba(124,58,237,.22)}.hero-title{font-size:clamp(2.25rem,4vw,3.35rem);line-height:1.08;letter-spacing:-.03em;margin:0 0 18px;color:var(--ink-950)}.hero-title-accent{display:block;background:linear-gradient(135deg,var(--violet-600) 0%,#a855f7 60%,#d97706 100%);-webkit-background-clip:text;background-clip:text;color:transparent}.hero-lead{font-size:1.12rem;line-height:1.62;color:var(--ink-700);margin:0 0 26px;max-width:60ch}.hero-cta-group{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px}.hero-quick-jumps{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:28px}.quick-jump-label{font-size:.82rem;font-weight:700;color:var(--ink-600);margin-right:4px}.quick-chip{font-size:.8rem;font-weight:700;padding:4px 11px;border-radius:999px;background:var(--surface-paper);border:1px solid var(--border-strong);color:var(--ink-800)}.quick-chip:hover{background:var(--violet-500);border-color:var(--violet-500);color:#fff}.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-top:22px;border-top:1px solid var(--border-hairline)}.stat-num{display:block;font-size:1.55rem;font-weight:800;letter-spacing:-.02em;color:var(--ink-900)}.stat-label{font-size:.82rem;color:var(--ink-600);font-weight:500}.math-view{display:inline-flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;font-family:var(--font-serif);color:var(--ink-950);padding:8px 4px}.math-view--compact{gap:7px;font-size:.92rem}.math-target{font-family:var(--font-sans);font-weight:800;font-size:.95em;padding:5px 12px;border-radius:9px;background:var(--violet-600);color:#fff;letter-spacing:.01em}.math-view--compact .math-target{padding:3px 9px;font-size:.82rem}.math-eq,.math-op{font-family:var(--font-serif);font-weight:700;font-size:1.15em;color:var(--violet-700);padding:0 2px}.math-const{font-family:var(--font-mono);font-weight:700;font-size:.96em;color:var(--ink-900);background:rgba(245,183,66,.24);padding:3px 9px;border-radius:7px}.math-fraction{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;gap:5px}.math-num,.math-den{display:inline-flex;align-items:center;gap:6px;padding:0 6px}.math-bar{width:100%;height:2px;background:var(--ink-900);border-radius:2px;opacity:.82}.math-token{font-family:var(--font-serif);font-style:italic;font-weight:600;font-size:1em;background:var(--violet-50);border:1px solid var(--border-strong);color:var(--ink-900);padding:3px 10px;border-radius:8px;white-space:nowrap}.math-view--compact .math-token{padding:2px 8px;font-size:.84rem}.math-inline-group{display:inline-flex;align-items:center;flex-wrap:wrap;gap:7px}.workbench-card,.single-calc-card{background:var(--surface-paper);border:1px solid var(--border-strong);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:26px}.workbench-header,.single-calc-top{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:16px}.workbench-kicker{display:block;font-size:.74rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--violet-600);margin-bottom:3px}.workbench-heading,.single-calc-heading{font-size:1.25rem;font-weight:800;margin:0;color:var(--ink-950);letter-spacing:-.02em}.wb-select{font-family:var(--font-sans);font-size:.84rem;font-weight:700;color:var(--ink-900);background:var(--violet-50);border:1px solid var(--border-strong);border-radius:10px;padding:8px 12px;max-width:210px;cursor:pointer}.wb-preset-tabs,.solve-mode-bar{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:16px}.solve-mode-label{font-size:.8rem;font-weight:700;color:var(--ink-600);margin-right:4px}.wb-tab,.solve-tab{font-family:var(--font-sans);font-size:.8rem;font-weight:700;padding:6px 12px;border-radius:8px;border:1px solid var(--border-hairline);background:var(--surface-subtle);color:var(--ink-700);cursor:pointer;transition:all .14s ease}.wb-tab:hover,.solve-tab:hover{border-color:var(--violet-400);color:var(--ink-950)}.wb-tab.is-active,.solve-tab.is-active{background:var(--ink-900);border-color:var(--ink-900);color:#fff}.wb-formula-stage,.single-formula-banner{background:linear-gradient(180deg,#faf8ff 0%,#f2edff 100%);border:1px solid var(--border-strong);border-radius:var(--radius-md);padding:16px 14px;margin-bottom:18px;text-align:center;overflow-x:auto}.wb-inputs{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin-bottom:18px}.calc-field label{display:block;font-size:.83rem;font-weight:700;color:var(--ink-800);margin-bottom:6px}.calc-input-wrap{display:flex;align-items:center;background:var(--surface-warm);border:1.5px solid var(--border-strong);border-radius:11px;padding:0 12px;transition:border-color .15s ease,box-shadow .15s ease}.calc-input-wrap:focus-within{border-color:var(--violet-500);box-shadow:0 0 0 3px rgba(124,58,237,.16);background:#fff}.calc-unit-prefix,.calc-unit-suffix{font-family:var(--font-mono);font-weight:700;font-size:.92rem;color:var(--violet-600);user-select:none}.calc-unit-prefix{margin-right:6px}.calc-unit-suffix{margin-left:6px}.calc-input-wrap input{width:100%;border:0;background:0 0;font-family:var(--font-mono);font-size:1.05rem;font-weight:700;color:var(--ink-950);padding:11px 0;outline:none;font-variant-numeric:tabular-nums}.wb-result-panel{background:linear-gradient(135deg,var(--ink-900) 0%,var(--violet-700) 100%);color:#fff;border-radius:var(--radius-md);padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.wb-result-label{display:block;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--gold-400)}.wb-result-sub{display:block;font-family:var(--font-mono);font-size:.78rem;color:rgba(255,255,255,.76);margin-top:2px}.wb-result-value-row{display:flex;align-items:center;gap:12px}.wb-result-value{font-family:var(--font-mono);font-size:clamp(1.55rem,2.6vw,2.05rem);font-weight:800;font-variant-numeric:tabular-nums;color:#fff;letter-spacing:-.02em}.btn-copy,.btn-reset{font-family:var(--font-sans);font-size:.78rem;font-weight:700;padding:6px 12px;border-radius:8px;cursor:pointer;transition:all .15s ease}.btn-copy{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.28)}.btn-copy:hover{background:rgba(255,255,255,.26)}.btn-reset{background:var(--surface-subtle);color:var(--ink-700);border:1px solid var(--border-strong)}.btn-reset:hover{background:var(--violet-100);color:var(--violet-700)}.wb-footer{margin-top:14px;padding-top:12px;border-top:1px solid var(--border-hairline);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.85rem}.wb-guide-link{font-weight:700;color:var(--violet-600)}.wb-deeplink{font-weight:600;color:var(--ink-600)}.directory-section{padding:68px 0}.section-header{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:32px}.section-kicker{display:inline-block;font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--violet-600);margin-bottom:6px}.section-kicker--gold{color:var(--gold-400)}.section-title{font-size:clamp(1.75rem,3vw,2.4rem);line-height:1.15;letter-spacing:-.025em;margin:0 0 10px;color:var(--ink-950)}.section-title--light{color:#fff}.section-subtitle{font-size:1.04rem;color:var(--ink-600);margin:0;max-width:65ch}.section-subtitle--light{color:rgba(255,255,255,.8)}.directory-controls{background:var(--surface-paper);border:1px solid var(--border-strong);border-radius:var(--radius-lg);padding:18px;margin-bottom:36px;box-shadow:var(--shadow-sm)}.search-box{position:relative;margin-bottom:14px}.search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--ink-500)}.search-input{width:100%;font-family:var(--font-sans);font-size:.98rem;padding:12px 16px 12px 42px;border-radius:11px;border:1.5px solid var(--border-strong);background:var(--surface-warm);color:var(--ink-950);outline:none}.search-input:focus{border-color:var(--violet-500);box-shadow:0 0 0 3px rgba(124,58,237,.14);background:#fff}.filter-pills{display:flex;flex-wrap:wrap;gap:8px}.filter-pill{font-family:var(--font-sans);font-size:.84rem;font-weight:700;padding:7px 14px;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface-subtle);color:var(--ink-700);cursor:pointer;transition:all .14s ease}.filter-pill:hover{border-color:var(--violet-500);color:var(--ink-950)}.filter-pill.is-active{background:var(--violet-600);border-color:var(--violet-600);color:#fff}.category-block{margin-bottom:48px}.category-block-header{margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid var(--border-hairline)}.category-block-title{font-size:1.38rem;font-weight:800;margin:0 0 4px;color:var(--ink-950)}.category-block-desc{margin:0;font-size:.95rem;color:var(--ink-600)}.calc-cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:20px}.calc-card{background:var(--surface-paper);border:1px solid var(--border-hairline);border-radius:var(--radius-lg);padding:22px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:var(--shadow-sm);transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}.calc-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--violet-400)}.calc-card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.calc-abbr-badge{font-family:var(--font-sans);font-weight:800;font-size:.84rem;padding:4px 11px;border-radius:8px;background:var(--violet-100);color:var(--violet-700)}.tier-badge{font-size:.72rem;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--surface-subtle);color:var(--ink-600)}.tier-badge--free{background:var(--emerald-50);color:var(--emerald-600)}.tier-badge--pro{background:#fff8eb;color:#b45309}.tier-badge--legacy{background:var(--violet-50);color:var(--violet-700)}.calc-card-title{font-size:1.16rem;font-weight:800;margin:0 0 8px;line-height:1.3}.calc-card-title a{color:var(--ink-950)}.calc-card-title a:hover{color:var(--violet-600)}.calc-card-lead{font-size:.91rem;color:var(--ink-600);margin:0 0 16px;flex-grow:1}.calc-card-formula{background:var(--surface-subtle);border:1px solid var(--border-hairline);border-radius:var(--radius-sm);padding:10px 8px;margin-bottom:16px;text-align:center;overflow-x:auto}.calc-card-footer{padding-top:12px;border-top:1px solid var(--border-hairline)}.calc-card-cta{display:inline-flex;align-items:center;gap:6px;font-size:.88rem;font-weight:700;color:var(--violet-600)}.showcase-section{background:linear-gradient(160deg,var(--ink-950) 0%,var(--ink-900) 55%,#2d1263 100%);color:#fff;padding:76px 0}.posture-tabs{display:inline-flex;background:rgba(255,255,255,8%);padding:5px;border-radius:12px;border:1px solid rgba(255,255,255,.16)}.posture-tab{font-family:var(--font-sans);font-size:.86rem;font-weight:700;color:rgba(255,255,255,.78);background:0 0;border:0;padding:8px 16px;border-radius:9px;cursor:pointer}.posture-tab.is-active{background:var(--gold-500);color:var(--ink-950)}.posture-gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:44px}.posture-gallery--wide{grid-template-columns:repeat(2,1fr)}.device-shot{margin:0;background:rgba(255,255,255,5%);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius-lg);padding:14px;text-align:center}.device-shot img{border-radius:12px;margin:0 auto 12px}.device-shot figcaption{font-size:.85rem;font-weight:600;color:rgba(255,255,255,.86)}.v4-bento-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:24px}.v4-bento-card{background:rgba(255,255,255,6%);border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-xl);padding:28px}.v4-bento-video{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center}.v4-tag{display:inline-block;font-size:.74rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--gold-400);margin-bottom:8px}.v4-bento-card h3{font-size:1.45rem;margin:0 0 10px;color:#fff}.v4-bento-card p{color:rgba(255,255,255,.8);margin:0 0 20px;font-size:.95rem}.v4-video-frame video{width:100%;max-height:360px;border-radius:16px;background:#000;box-shadow:0 12px 32px rgba(0,0,0,.4)}.icon-parade{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.icon-chip{background:rgba(255,255,255,6%);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:12px 8px;display:flex;flex-direction:column;align-items:center;gap:7px;font-size:.8rem;font-weight:700;color:rgba(255,255,255,.9)}.icon-chip img{border-radius:16px;box-shadow:0 6px 16px rgba(0,0,0,.3)}.pillars-section{padding:64px 0;background:var(--surface-paper);border-top:1px solid var(--border-hairline)}.pillars-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.pillar-card{background:var(--surface-warm);border:1px solid var(--border-hairline);border-radius:var(--radius-lg);padding:26px}.pillar-num{font-family:var(--font-mono);font-size:.82rem;font-weight:800;color:var(--violet-600);margin-bottom:10px}.pillar-card h3{font-size:1.2rem;margin:0 0 10px;color:var(--ink-950)}.pillar-card p{margin:0;color:var(--ink-600);font-size:.95rem}.page-hero{padding:36px 0 32px;background:linear-gradient(180deg,#f6f2ff 0%,var(--surface-warm) 100%);border-bottom:1px solid var(--border-hairline)}.breadcrumb ol{list-style:none;margin:0 0 14px;padding:0;display:flex;flex-wrap:wrap;gap:8px;font-size:.84rem;color:var(--ink-600)}.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--ink-500)}.calc-hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.calc-category-pill{font-size:.76rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;padding:3px 10px;border-radius:999px;background:var(--violet-100);color:var(--violet-700)}.page-title{font-size:clamp(1.85rem,3.2vw,2.65rem);line-height:1.12;letter-spacing:-.025em;margin:0 0 12px;color:var(--ink-950)}.page-lead{font-size:1.1rem;color:var(--ink-700);margin:0;max-width:68ch}.calc-workspace-section{padding:36px 0}.calc-workspace-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:28px;align-items:start}.single-calc-actions{margin-top:18px;padding-top:16px;border-top:1px solid var(--border-hairline);display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px}.calc-sidebar{display:flex;flex-direction:column;gap:20px}.example-card{background:var(--surface-paper);border:1px solid var(--border-strong);border-radius:var(--radius-lg);padding:22px;box-shadow:var(--shadow-sm)}.example-badge{display:inline-block;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--violet-600);margin-bottom:4px}.example-card h3{margin:0 0 10px;font-size:1.12rem}.example-scenario{font-size:.92rem;color:var(--ink-700);margin:0 0 12px}.example-steps{margin:0 0 14px;padding-left:18px;font-size:.88rem;color:var(--ink-800)}.example-steps li{margin-bottom:6px}.example-result-box{background:var(--violet-50);border:1px solid var(--border-strong);border-radius:10px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.example-result-kicker{font-size:.78rem;font-weight:700;color:var(--ink-600);text-transform:uppercase}.example-result-val{font-family:var(--font-mono);font-size:1.05rem;color:var(--violet-700)}.example-takeaway{margin:0;font-size:.86rem;color:var(--ink-600)}.app-upsell-card{background:linear-gradient(145deg,var(--ink-900) 0%,var(--violet-700) 100%);color:#fff;border-radius:var(--radius-lg);padding:20px;display:flex;align-items:flex-start;gap:14px}.upsell-icon{border-radius:12px;flex-shrink:0}.app-upsell-card h3{font-size:1rem;margin:0 0 6px;color:#fff}.app-upsell-card p{font-size:.85rem;color:rgba(255,255,255,.82);margin:0 0 12px}.formula-reference-section{padding:28px 0 44px}.section-title-sm{font-size:1.45rem;margin:0 0 6px;color:var(--ink-950)}.section-desc-sm{margin:0 0 20px;color:var(--ink-600);font-size:.95rem}.formula-variations-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}.formula-var-card{background:var(--surface-paper);border:1px solid var(--border-hairline);border-radius:var(--radius-md);padding:18px;display:flex;flex-direction:column;justify-content:space-between}.formula-var-tag{font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--violet-600)}.formula-var-header h3{font-size:1.02rem;margin:2px 0 12px}.formula-var-stage{background:var(--surface-subtle);border-radius:10px;padding:14px 10px;text-align:center;margin-bottom:12px;overflow-x:auto}.formula-plain-code{display:block;font-family:var(--font-mono);font-size:.78rem;color:var(--ink-600);background:var(--surface-warm);padding:7px 10px;border-radius:6px;border:1px solid var(--border-hairline)}.editorial-section{padding:20px 0 56px}.editorial-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}.prose-card,.faq-card{background:var(--surface-paper);border:1px solid var(--border-hairline);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm)}.prose-card h2,.faq-card h2{font-size:1.35rem;margin-top:0;margin-bottom:16px;color:var(--ink-950)}.prose-content h2{font-size:1.18rem;margin-top:24px;margin-bottom:8px;color:var(--ink-900)}.prose-content h3{font-size:1.05rem;margin-top:20px;margin-bottom:6px}.prose-content p,.prose-content li{color:var(--ink-700);font-size:.97rem}.prose-content code{font-family:var(--font-mono);font-size:.86em;background:var(--violet-50);color:var(--violet-700);padding:2px 6px;border-radius:5px}.faq-list{display:flex;flex-direction:column;gap:12px}.faq-item{border:1px solid var(--border-hairline);border-radius:12px;padding:14px 16px;background:var(--surface-warm)}.faq-item[open]{border-color:var(--border-strong);background:#fff}.faq-question{font-weight:700;font-size:.96rem;color:var(--ink-950);cursor:pointer}.faq-answer p{margin:10px 0 0;font-size:.92rem;color:var(--ink-700)}.related-section{padding:48px 0 68px;background:var(--surface-subtle);border-top:1px solid var(--border-hairline)}.related-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}.related-header h2{margin:0;font-size:1.4rem}.view-all-link{font-weight:700}.doc-section{padding:40px 0 72px}.doc-container{max-width:860px}.site-footer{background:var(--ink-950);color:rgba(255,255,255,.78);padding:64px 0 36px}.footer-top{display:grid;grid-template-columns:1.3fr repeat(4,1fr);gap:28px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.12)}.footer-tagline{font-size:.9rem;line-height:1.55;color:rgba(255,255,255,.7);margin:14px 0 18px}.footer-cta-row{display:flex;flex-wrap:wrap;gap:8px}.footer-heading{font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--gold-400);margin:0 0 12px}.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px;font-size:.82rem}.footer-links a{color:rgba(255,255,255,.74)}.footer-links a:hover{color:#fff}.footer-abbr{font-weight:700;color:#fff}.footer-bottom{padding-top:24px;font-size:.84rem;color:rgba(255,255,255,.62)}.footer-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.footer-meta a{color:rgba(255,255,255,.78)}.footer-meta a:hover{color:#fff}.footer-sep{opacity:.4}@media(max-width:1080px){.hero-grid,.calc-workspace-grid,.editorial-grid,.v4-bento-grid,.v4-bento-video{grid-template-columns:1fr}.footer-top{grid-template-columns:repeat(2,1fr)}.posture-gallery{grid-template-columns:repeat(2,1fr)}}@media(max-width:820px){.site-nav{display:none}.mobile-menu-toggle{display:inline-flex}.pillars-grid{grid-template-columns:1fr}.calc-cards-grid{grid-template-columns:1fr}}@media(max-width:560px){.hero-stats,.posture-gallery,.posture-gallery--wide,.footer-top{grid-template-columns:1fr}.workbench-card,.single-calc-card{padding:18px}}