/* Linear Lens V21 — inherits the V11 academic design system. */
:root{--ll-math:"STIX Two Math","Cambria Math","Latin Modern Math","Times New Roman",serif;--ll-purple:var(--purple,#4b3f8f);--ll-border:var(--border,#dde0e5);--ll-soft:var(--soft,#f5f5f7);--ll-soft2:var(--soft2,#fafafa);--ll-text:var(--text,#1b1c20);--ll-muted:var(--muted,#626872);--ll-serif:var(--serif,"Source Serif 4",serif);--ll-sans:var(--sans,Inter,sans-serif)}
.ll-hero{padding:70px 0 42px;border-bottom:1px solid var(--ll-border);background:var(--bg,#fff)}.ll-breadcrumb{display:flex;gap:8px;align-items:center;margin-bottom:22px;font:600 11px/1.2 var(--ll-sans);color:var(--ll-muted)}.ll-breadcrumb a{color:var(--ll-purple);text-decoration:none}.ll-hero-grid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(260px,.65fr);gap:52px;align-items:start}.ll-kicker{font:700 10px/1.2 var(--ll-sans);letter-spacing:.12em;color:var(--ll-purple);margin:0 0 9px}.ll-hero h1{font:700 clamp(48px,7vw,82px)/.96 var(--ll-serif);letter-spacing:-.035em;margin:0}.ll-deck{max-width:800px;font:400 clamp(18px,2.1vw,24px)/1.5 var(--ll-serif);color:var(--ll-muted);margin:20px 0 0}.ll-pills{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}.ll-pills span{padding:7px 10px;border:1px solid var(--ll-border);border-radius:999px;font:600 11px/1 var(--ll-sans);color:var(--ll-muted);background:var(--bg,#fff)}.ll-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:22px}.ll-btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 15px;border:1px solid var(--ll-border);border-radius:10px;background:var(--bg,#fff);font:700 12px/1 var(--ll-sans);color:var(--ll-text);text-decoration:none;cursor:pointer}.ll-btn:hover{border-color:var(--ll-purple);color:var(--ll-purple)}.ll-btn.primary{background:var(--ll-purple);border-color:var(--ll-purple);color:#fff}.ll-btn.wide{width:100%}.ll-btn:disabled{opacity:.46;cursor:not-allowed}.ll-btn:focus-visible,.ll-select:focus-visible,input:focus-visible,summary:focus-visible,.ll-local-nav a:focus-visible{outline:3px solid color-mix(in srgb,var(--ll-purple) 35%,transparent);outline-offset:2px}.ll-hero-note{border:1px solid var(--ll-border);border-radius:16px;padding:22px;background:var(--ll-soft2)}.ll-hero-note>strong{font:700 18px/1.25 var(--ll-serif)}.ll-hero-note>p{font:400 13px/1.65 var(--ll-sans);color:var(--ll-muted);margin:9px 0 15px}.ll-evidence-key{display:grid;gap:7px}.ll-evidence-key span{font:500 11px/1.4 var(--ll-sans);color:var(--ll-muted)}.ll-evidence-key b,.ll-evidence-type{display:inline-block;min-width:68px;margin-right:7px;padding:4px 6px;border:1px solid var(--ll-border);border-radius:6px;background:#fff;font:700 9px/1 var(--ll-sans);letter-spacing:.06em;text-align:center;color:var(--ll-purple)}.ll-local-nav{display:flex;gap:7px;flex-wrap:wrap;margin-top:35px;padding-top:18px;border-top:1px solid var(--ll-border)}.ll-local-nav a{min-height:40px;display:inline-flex;align-items:center;padding:0 12px;border:1px solid var(--ll-border);border-radius:999px;text-decoration:none;font:600 11px/1 var(--ll-sans);color:var(--ll-muted)}
.ll-section{padding:68px 0;border-bottom:1px solid var(--ll-border)}.ll-section.soft{background:var(--ll-soft2)}.ll-section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.72fr);gap:54px;align-items:end;margin-bottom:28px}.ll-section-head h2{font:700 clamp(31px,4vw,48px)/1.06 var(--ll-serif);letter-spacing:-.02em;margin:0}.ll-section-head>p{font:400 13px/1.7 var(--ll-sans);color:var(--ll-muted);margin:0}.ll-mental-model{display:grid;grid-template-columns:1fr 34px 1fr 34px 1fr 34px 1fr;gap:10px;align-items:stretch}.ll-mental-model article{padding:22px;border:1px solid var(--ll-border);border-radius:16px;background:#fff}.ll-mental-model h3{font:700 20px/1.2 var(--ll-serif);margin:10px 0 7px}.ll-mental-model p{font:400 12px/1.65 var(--ll-sans);color:var(--ll-muted);margin:0}.ll-concept-symbol{min-width:44px;height:44px;padding:0 8px;border-radius:11px;background:var(--ll-soft);display:inline-grid;place-items:center;font:500 24px/1 var(--ll-math);color:var(--ll-purple)}.ll-flow-arrow{display:grid;place-items:center;color:var(--ll-muted);font:400 24px var(--ll-math)}.ll-callout{margin-top:22px;padding:18px 20px;border-left:3px solid var(--ll-purple);background:var(--ll-soft);border-radius:0 12px 12px 0}.ll-callout strong{font:700 16px/1.2 var(--ll-serif)}.ll-callout p{font:400 12px/1.65 var(--ll-sans);color:var(--ll-muted);margin:5px 0 0}
.ll-formula-flow{display:grid;gap:13px}.ll-formula-card{display:grid;grid-template-columns:44px minmax(0,1fr);gap:18px;padding:22px;border:1px solid var(--ll-border);border-radius:16px;background:#fff}.ll-step{width:38px;height:38px;border-radius:50%;background:var(--ll-soft);display:grid;place-items:center;font:700 11px var(--ll-sans);color:var(--ll-purple)}.ll-formula-card h3{font:700 21px/1.2 var(--ll-serif);margin:0 0 8px}.ll-formula-card p{font:400 12.5px/1.7 var(--ll-sans);color:var(--ll-muted);margin:8px 0 0}.ll-equation{display:flex;align-items:center;justify-content:center;min-height:56px;padding:10px 14px;border:1px solid color-mix(in srgb,var(--ll-border) 76%,transparent);border-radius:12px;background:linear-gradient(180deg,#fff 0%,var(--ll-soft2) 100%);overflow-x:auto;overflow-y:hidden;color:var(--ll-text)}.ll-katex-display{display:block;margin:auto;max-width:100%;font-size:1em}.ll-equation .katex-display{margin:.2rem auto !important}.ll-equation .katex{font-size:1em;color:var(--ll-text)}.ll-equation .katex-display>.katex{max-width:100%}.ll-equation .katex-html{overflow-x:auto;overflow-y:hidden;padding:.04rem 0}.ll-equation .base{white-space:nowrap}.ll-equation-text{font:400 clamp(16px,1.45vw,20px)/1.35 "Source Serif 4",serif;letter-spacing:.002em}.ll-equation-text i{font-family:"STIX Two Text","Source Serif 4",serif;font-style:italic;font-weight:500}.ll-formula-card .ll-equation+ p{margin-top:11px}.ll-symbol-grid b,.ll-concept-symbol{font-family:var(--ll-math);font-synthesis:none}.ll-purpose{color:var(--ll-text)!important}.ll-role-rule{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}.ll-role-rule span{padding:9px 10px;border:1px solid var(--ll-border);border-radius:8px;font:500 11px/1.45 var(--ll-sans);color:var(--ll-muted)}.ll-symbol-guide{margin-top:18px;border:1px solid var(--ll-border);border-radius:14px;background:#fff}.ll-symbol-guide summary{cursor:pointer;padding:16px 18px;font:700 13px/1.4 var(--ll-sans)}.ll-symbol-guide[open] summary{border-bottom:1px solid var(--ll-border)}.ll-symbol-grid{display:grid;grid-template-columns:repeat(3,1fr)}.ll-symbol-grid>div{padding:13px 17px;border-right:1px solid var(--ll-border);border-bottom:1px solid var(--ll-border)}.ll-symbol-grid>div:nth-child(3n){border-right:0}.ll-symbol-grid b{display:block;font:500 19px/1.2 var(--ll-math);color:var(--ll-purple)}.ll-symbol-grid span{display:block;margin-top:4px;font:400 11px/1.45 var(--ll-sans);color:var(--ll-muted)}
.ll-role-grid,.ll-hci-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.ll-role-grid article,.ll-hci-grid article{padding:20px;border:1px solid var(--ll-border);border-radius:15px;background:#fff}.ll-role-grid h3,.ll-hci-grid h3{font:700 19px/1.25 var(--ll-serif);margin:10px 0 7px}.ll-role-grid p,.ll-hci-grid p{font:400 12px/1.65 var(--ll-sans);color:var(--ll-muted);margin:0}.ll-role-tag{display:inline-flex;padding:5px 7px;border:1px solid var(--ll-border);border-radius:6px;font:700 9px/1 var(--ll-sans);letter-spacing:.05em}.ll-role-tag.mono,.ll-role-tag.uni{color:#236d4c}.ll-role-tag.poly,.ll-role-tag.multi{color:var(--ll-purple)}.ll-role-tag.flat,.ll-role-tag.muted{color:#7a5b23}
.ll-ledger{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 20px}.ll-ledger>div{padding:17px;border:1px solid var(--ll-border);border-radius:13px;background:#fff}.ll-ledger strong{display:block;font:700 27px/1 var(--ll-serif)}.ll-ledger span{display:block;margin-top:6px;font:500 10px/1.4 var(--ll-sans);color:var(--ll-muted)}.ll-live-grid,.ll-own-grid{display:grid;grid-template-columns:minmax(280px,.72fr) minmax(0,1.28fr);gap:14px}.ll-panel{border:1px solid var(--ll-border);border-radius:17px;background:#fff;overflow:hidden}.ll-panel-head{padding:18px 20px;border-bottom:1px solid var(--ll-border)}.ll-panel-head h3{font:700 20px/1.2 var(--ll-serif);margin:0}.ll-panel-head p{font:400 11px/1.55 var(--ll-sans);color:var(--ll-muted);margin:5px 0 0}.ll-panel-body{padding:20px}.ll-panel-body label{display:block;margin:0 0 7px;font:700 11px/1.3 var(--ll-sans)}.ll-select{width:100%;min-height:44px;border:1px solid var(--ll-border);border-radius:9px;padding:0 10px;background:#fff;font:500 12px var(--ll-sans)}.ll-help{font:400 10.5px/1.5 var(--ll-sans);color:var(--ll-muted);margin:7px 0 14px}.ll-status{min-height:42px;margin:12px 0 0;padding:10px 12px;border-left:3px solid var(--ll-border);background:var(--ll-soft2);font:500 11px/1.5 var(--ll-sans);color:var(--ll-muted)}.ll-status[data-tone="ok"]{border-left-color:#27835a}.ll-status[data-tone="error"]{border-left-color:#a43a3a}.ll-status[data-tone="loading"]{border-left-color:var(--ll-purple)}.ll-placeholder{min-height:240px;display:grid;place-items:center;text-align:center;padding:30px;color:var(--ll-muted)}.ll-placeholder strong{display:block;font:700 18px/1.25 var(--ll-serif);color:var(--ll-text)}.ll-placeholder span{display:block;max-width:470px;margin-top:7px;font:400 11px/1.6 var(--ll-sans)}.ll-result-head{display:flex;justify-content:space-between;gap:20px;align-items:start}.ll-result-head h3{font:700 24px/1.1 var(--ll-serif);margin:0}.ll-result-head p{font:400 10px/1.5 var(--ll-sans);color:var(--ll-muted);margin:4px 0 0}.ll-pass{font:700 10px/1 var(--ll-sans);color:#236d4c}.ll-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:16px 0}.ll-metric{padding:11px;border:1px solid var(--ll-border);border-radius:10px;background:var(--ll-soft2)}.ll-metric strong{display:block;font:700 18px/1.1 var(--ll-serif)}.ll-metric span{display:block;margin-top:5px;font:500 9px/1.35 var(--ll-sans);color:var(--ll-muted)}.ll-subtitle{font:700 18px/1.25 var(--ll-serif);margin:22px 0 10px}.ll-table-wrap{overflow:auto;border:1px solid var(--ll-border);border-radius:11px}.ll-table{width:100%;border-collapse:collapse;min-width:660px;font:500 10.5px/1.45 var(--ll-sans)}.ll-table th,.ll-table td{padding:9px 10px;border-bottom:1px solid var(--ll-border);text-align:left;vertical-align:top}.ll-table thead th{background:var(--ll-soft);font-size:9px;text-transform:uppercase;letter-spacing:.04em;color:var(--ll-muted)}.ll-strength{width:110px}.ll-strength-track{height:7px;border-radius:999px;background:var(--ll-soft);overflow:hidden}.ll-strength-bar{height:100%;background:var(--ll-purple)}.ll-path{display:flex;gap:7px;flex-wrap:wrap;align-items:center;padding:14px;border:1px solid var(--ll-border);border-radius:10px;background:var(--ll-soft2)}.ll-path span{padding:6px 8px;border-radius:7px;background:#fff;border:1px solid var(--ll-border);font:600 10px/1.3 var(--ll-sans)}
.ll-privacy{display:flex;gap:12px;padding:13px 15px;margin-bottom:18px;border:1px solid var(--ll-border);border-radius:11px;background:var(--ll-soft2);font:500 11px/1.5 var(--ll-sans);color:var(--ll-muted)}.ll-privacy strong{color:var(--ll-text)}.ll-upload{display:block;margin-bottom:12px!important;padding:17px;border:1.5px dashed var(--ll-border);border-radius:12px;background:var(--ll-soft2);cursor:pointer}.ll-upload b{display:block;font:700 13px var(--ll-sans)}.ll-upload span{display:block;margin:5px 0 10px;font:400 10.5px/1.5 var(--ll-sans);color:var(--ll-muted)}.ll-upload input{max-width:100%;min-height:38px}.ll-code{margin:12px 0;padding:12px;border-radius:9px;background:#17181c;color:#ececf1;overflow:auto}.ll-code code{font:500 10.5px/1.55 ui-monospace,SFMono-Regular,Menlo,monospace}.ll-downloads{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.ll-evidence-actions{display:flex;gap:8px;flex-wrap:wrap}.ll-evidence-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:18px 0}.ll-evidence-card{padding:16px;border:1px solid var(--ll-border);border-radius:12px;background:#fff}.ll-evidence-card strong{display:block;font:700 23px/1.1 var(--ll-serif)}.ll-evidence-card span{display:block;margin-top:5px;font:500 10px/1.4 var(--ll-sans);color:var(--ll-muted)}.ll-explorer-controls{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:14px 0}.ll-paper-strip{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-top:24px;padding:18px 20px;border:1px solid var(--ll-border);border-radius:14px;background:#fff}.ll-paper-strip strong{display:block;font:700 18px/1.25 var(--ll-serif);margin:8px 0 4px}.ll-paper-strip p{font:400 11px/1.6 var(--ll-sans);color:var(--ll-muted);margin:0;max-width:780px}.ll-compare-table{width:100%;border-collapse:collapse;min-width:900px;font:500 11px/1.55 var(--ll-sans)}.ll-compare-table th,.ll-compare-table td{padding:13px 12px;border-bottom:1px solid var(--ll-border);text-align:left;vertical-align:top}.ll-compare-table thead th{background:var(--ll-soft);font-size:9px;text-transform:uppercase;letter-spacing:.04em;color:var(--ll-muted)}.ll-compare-table .is-linear-lens{background:color-mix(in srgb,var(--ll-purple) 5%,white)}.ll-cta{display:flex;justify-content:space-between;gap:40px;align-items:end;padding-top:60px;padding-bottom:68px}.ll-cta h2{font:700 34px/1.1 var(--ll-serif);margin:0}.ll-cta p:not(.ll-kicker){max-width:720px;font:400 12px/1.65 var(--ll-sans);color:var(--ll-muted);margin:9px 0 0}
@media(max-width:1000px){.ll-hero-grid,.ll-section-head,.ll-live-grid,.ll-own-grid{grid-template-columns:1fr}.ll-mental-model{grid-template-columns:1fr}.ll-flow-arrow{transform:rotate(90deg);min-height:25px}.ll-role-grid,.ll-hci-grid{grid-template-columns:1fr 1fr}.ll-ledger,.ll-evidence-summary{grid-template-columns:1fr 1fr}.ll-symbol-grid{grid-template-columns:1fr 1fr}.ll-symbol-grid>div:nth-child(3n){border-right:1px solid var(--ll-border)}.ll-symbol-grid>div:nth-child(2n){border-right:0}.ll-explorer-controls{grid-template-columns:1fr 1fr}.ll-cta{align-items:flex-start;flex-direction:column}}
@media(max-width:650px){.ll-section{padding:50px 0}.ll-role-grid,.ll-hci-grid,.ll-ledger,.ll-evidence-summary,.ll-symbol-grid,.ll-role-rule,.ll-explorer-controls,.ll-metrics{grid-template-columns:1fr}.ll-symbol-grid>div{border-right:0!important}.ll-formula-card{grid-template-columns:1fr}.ll-paper-strip{align-items:flex-start;flex-direction:column}.ll-privacy{flex-direction:column}.ll-hero{padding-top:48px}.ll-local-nav a{padding:0 10px}.ll-result-head{flex-direction:column}}
.ll-complement-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-top:10px}.ll-compare-mini{padding:14px;border:1px solid var(--ll-border);border-radius:11px;background:var(--ll-soft2)}.ll-compare-mini h5{font:700 14px/1.25 var(--ll-serif);margin:0 0 6px}.ll-compare-mini p,.ll-compare-mini li{font:400 10.5px/1.5 var(--ll-sans);color:var(--ll-muted)}.ll-compare-mini ol{padding-left:18px;margin:9px 0 0}.ll-compare-mini li+li{margin-top:4px}@media(max-width:800px){.ll-complement-grid{grid-template-columns:1fr}}

@media (max-width:640px){
  .ll-equation{min-height:62px;padding:13px 12px;justify-content:flex-start}
  .ll-equation math{font-size:20px;margin-left:auto;margin-right:auto}
  .ll-equation-text{font-size:18px;text-align:center}
}

@media (max-width:640px){.ll-equation{min-height:50px;padding:8px 10px;justify-content:center}.ll-equation .katex{font-size:.9em}.ll-equation-text{font-size:16px;text-align:center}}