:root{--navy:#152538;--ink:#1b2e40;--muted:#617182;--burgundy:#a4334a;--orange:#c75b14;--teal:#007f82;--blue:#365fbb;--line:#dce3e9;--bg:#f2f5f8;--radius:18px;font-family:Calibri,'Segoe UI',sans-serif;color:var(--ink);font-size:17px}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,a,input,select{-webkit-tap-highlight-color:transparent}button,select,input{font:inherit}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #d36b1f;outline-offset:4px}button:disabled{cursor:default;opacity:.45}.topbar{height:82px;display:flex;align-items:center;justify-content:space-between;padding:0 34px;background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:10}.brand{text-decoration:none;display:flex;align-items:center;gap:13px;font-size:24px;font-weight:700;letter-spacing:-.4px}.brand em{font-style:normal;font-weight:400}.brand-mark{width:41px;height:41px;background:var(--burgundy);color:white;border-radius:12px;font-family:Georgia,serif;display:grid;place-items:center;font-size:32px}.top-note{font-size:12px;letter-spacing:1.6px;color:var(--muted)}.menu-button{display:none}.app-layout{display:grid;grid-template-columns:268px minmax(0,1fr);min-height:calc(100vh - 82px)}aside{background:var(--navy);color:#fff;padding:30px 18px 26px;max-height:calc(100vh - 82px);position:sticky;top:0;overflow:auto;scrollbar-width:thin;scrollbar-color:#66788b transparent}.nav-intro{padding:0 14px 20px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:1.5px}.nav-intro .eyebrow{color:#aabccd}.nav-intro p{font-size:21px;margin:8px 0 0}nav details{margin:0 0 10px}nav summary{font-size:14px;font-weight:600;color:#bdcddd;padding:11px 12px;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between}nav summary::after{content:'+';font-weight:400;font-size:18px}nav details[open] summary::after{content:'−'}nav button{display:block;width:100%;text-align:left;border:0;background:transparent;color:#d6e0e9;border-radius:9px;padding:10px 12px;font-size:14px;line-height:1.35;position:relative;margin:2px 0}nav button:hover{background:#24384c}nav button[aria-current="page"]{background:#fff;color:var(--navy);font-weight:700}nav button[aria-current="page"]::before{content:'';position:absolute;left:0;top:9px;bottom:9px;width:3px;background:var(--burgundy);border-radius:3px}.source-note{border-top:1px solid #3b4b5c;font-size:12px;line-height:1.7;color:#b6c5d3;margin:25px 12px 0;padding-top:18px}.source-note a{display:inline-block;margin-top:9px;color:#fff;text-underline-offset:4px}main{padding:34px clamp(20px,3vw,50px) 28px;max-width:1600px;width:100%;margin:auto}.topic-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:25px}.topic-heading .eyebrow{color:var(--burgundy);margin:0 0 10px}h1{font:400 clamp(29px,3.1vw,43px)/1.12 Georgia,'Times New Roman',serif;letter-spacing:-.6px;margin:0}h2{margin:0;font-size:21px;line-height:1.3}.topic-index{color:var(--muted);font-size:14px;white-space:nowrap}.workspace{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(260px,1fr);gap:22px;align-items:stretch}.figure-panel{background:white;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;min-width:0}.figure-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:15px 20px;border-bottom:1px solid #e8edf2}.figure-toolbar>div{display:flex;gap:7px;align-items:center}.live-label{font-size:14px;color:var(--muted)}.drag-icon{color:var(--burgundy);font-size:21px;vertical-align:middle;margin-right:5px}.soft-button,.icon-button,.menu-button{background:#f0f3f6;border:1px solid #e0e7ed;color:var(--ink);border-radius:8px;font-size:14px;font-weight:600;padding:9px 12px;min-height:38px}.soft-button:hover,.icon-button:hover{background:#e4ebf1}.icon-button{font-size:22px;padding:3px 11px}.soft-button[aria-pressed=true]{background:var(--burgundy);color:#fff;border-color:var(--burgundy)}.drawing-wrap{background-image:radial-gradient(#dce4ec .85px,transparent .85px);background-size:22px 22px;position:relative;padding:3px 8px}#drawing{width:100%;height:auto;display:block;min-height:300px;overflow:visible;user-select:none}#drawing text{font-family:Calibri,'Segoe UI',sans-serif;paint-order:stroke;stroke:white;stroke-width:5px;stroke-linejoin:round;fill:var(--ink)}#drawing .math-label{font-weight:700;font-size:18px}#drawing .measure{font-size:17px;font-weight:600}#drawing .small-label{font-size:15px}#drawing .handle{cursor:grab;touch-action:none;outline:none}#drawing .handle:active{cursor:grabbing}#drawing .handle .hit{fill:transparent;stroke:none}#drawing .handle .halo{fill:#fff;stroke:#a4334a;stroke-width:2;transition:stroke-width .15s}#drawing .handle:hover .halo,#drawing .handle:focus .halo{stroke-width:4;fill:#f9e9ec}#drawing .handle:focus .hit{stroke:#c75b14;stroke-width:2;stroke-dasharray:3 3}#drawing .handle .dot{fill:#a4334a}.controls{padding:8px 24px 3px;display:grid;gap:12px}.slider-row{display:grid;grid-template-columns:minmax(110px,auto) minmax(70px,1fr) 64px;gap:12px;align-items:center;font-size:14px}.slider-row output{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}input[type=range]{width:100%;accent-color:var(--burgundy);min-height:26px;cursor:pointer}.interaction-hint{font-size:13px;color:var(--muted);line-height:1.5;padding:0 23px;margin:13px 0 18px}.results-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 25px;display:flex;flex-direction:column}.results-panel>.eyebrow{color:var(--teal);margin-bottom:10px}.results-panel h2{font:400 27px/1.2 Georgia,serif;margin-bottom:23px}.readout{display:grid;gap:12px}.equation{padding:15px 16px;background:#f5f7fa;border-radius:11px;border-left:3px solid var(--teal)}.equation.burgundy{border-left-color:var(--burgundy)}.equation.orange{border-left-color:var(--orange)}.equation.blue{border-left-color:var(--blue)}.equation .eq-label{font-size:14px;margin-bottom:6px;font-weight:600;line-height:1.35}.equation .eq-value{font-variant-numeric:tabular-nums;font-size:clamp(18px,1.8vw,25px);line-height:1.4;letter-spacing:-.3px}.eq-value strong{font-weight:700;color:var(--teal)}.burgundy .eq-value strong{color:var(--burgundy)}.orange .eq-value strong{color:var(--orange)}.blue .eq-value strong{color:var(--blue)}.mini-values{font-size:14px;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px 17px;line-height:1.6;margin:3px 1px}.notice{border-top:1px solid var(--line);margin-top:24px;padding-top:20px}.notice .eyebrow{color:var(--burgundy)}.notice p{font-size:16px;line-height:1.5;margin:8px 0 0}.precision{font-size:12px;line-height:1.5;color:var(--muted);margin-top:auto;padding-top:20px;margin-bottom:0}.theory-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:25px 28px;margin-top:23px}.theory-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:20px}.theory-heading .eyebrow{color:var(--muted);display:block;margin-bottom:7px}.page-badge{background:#f1f4f7;padding:7px 11px;border-radius:6px;font-size:12px;color:var(--muted);white-space:nowrap}.theory{display:grid;gap:13px}.rule{padding-left:15px;border-left:2px solid #d9e1e9;font-size:17px;line-height:1.55}.rule strong{display:block;font-size:13px;font-weight:600;color:var(--burgundy);margin-bottom:3px}.insight{font-size:15px;line-height:1.6;color:#526375;margin-top:22px;background:#f3f7fa;border-radius:10px;padding:14px 17px}.insight:empty{display:none}.variants{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.variants:empty{display:none}.variants button{font-size:14px;padding:9px 12px;border:1px solid #d5dfe8;background:white;border-radius:7px;color:var(--ink)}.variants button[aria-pressed=true]{background:var(--navy);color:#fff;border-color:var(--navy)}.topic-footer{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-top:24px}.topic-footer span{font-size:12px;line-height:1.5;color:var(--muted);text-align:center;max-width:470px}.topic-footer button{white-space:nowrap}@media(min-width:1600px){.drawing-wrap{padding:6px 40px}main{padding-top:40px}}@media(max-width:1150px){.app-layout{grid-template-columns:232px minmax(0,1fr)}main{padding:28px 24px}.workspace{grid-template-columns:minmax(0,1.4fr) minmax(240px,1fr);gap:16px}.results-panel{padding:22px 18px}.figure-toolbar{padding:12px}.live-label{font-size:12px}.slider-row{grid-template-columns:100px minmax(60px,1fr) 52px;gap:8px}}@media(max-width:950px){.workspace{grid-template-columns:1fr}.results-panel{display:block}.readout{grid-template-columns:repeat(2,minmax(0,1fr))}.readout>.mini-values{grid-column:1/-1}.notice{margin-top:18px;padding-top:15px}.results-panel h2{margin-bottom:17px}#drawing{max-height:480px}.precision{padding-top:8px}.top-note{display:none}.topic-footer span{display:none}}@media(max-width:700px){.topbar{height:70px;padding:0 17px;gap:10px}.brand{font-size:19px;gap:9px}.brand-mark{width:35px;height:35px;font-size:29px;border-radius:10px}.brand em{display:block;font-size:15px}.menu-button{display:block;white-space:nowrap}.app-layout{display:block}aside{display:none;position:relative;max-height:65vh;padding:20px 18px}body.menu-open aside{display:block}main{padding:25px 16px}.topic-heading{margin-bottom:21px;gap:8px}h1{font-size:32px}.topic-index{font-size:12px}.topic-heading .eyebrow{font-size:11px;letter-spacing:1px}.figure-toolbar{padding:11px 12px}.live-label{font-size:13px}.drawing-wrap{padding:0}#drawing{min-height:270px;overflow:hidden}.controls{padding:5px 18px}.interaction-hint{padding:0 17px;font-size:12px}.results-panel{padding:23px 20px}.equation{padding:13px}.eq-value{font-size:21px!important}.readout{gap:10px}.theory-panel{padding:23px 20px}.theory-heading{gap:8px}.theory-heading h2{font-size:20px}.rule{font-size:16px}.slider-row{grid-template-columns:115px minmax(65px,1fr) 60px}.source-note{margin-top:15px}}@media(max-width:360px){.readout{grid-template-columns:1fr}.live-label{font-size:12px}.soft-button{padding:8px}.slider-row{grid-template-columns:100px minmax(50px,1fr) 49px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

#drawing{touch-action:none}
@media(max-width:700px){#drawing .math-label{font-size:25px}#drawing .measure{font-size:24px}#drawing .small-label{font-size:23px}#drawing .handle .hit{r:38px}#drawing .handle .halo{r:11px}#drawing .handle .dot{r:4px}}

[hidden]{display:none!important}.congruence-action{margin:12px 22px 18px;padding:16px;background:#f3f6f9;border-radius:10px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}.congruence-action>span{display:flex;flex-wrap:wrap;gap:8px 16px;font-size:14px}.given-key{color:var(--burgundy)}.consequence-key{color:var(--blue)}.congruence-action p{flex-basis:100%;margin:0;font-size:15px;line-height:1.5}.congruence-action button[aria-pressed=true]{background:var(--blue);color:white}

/* Stoicheia: a reference work in the original source order. */
body{background:#f6f3ee}.topbar{border-bottom:3px solid #a4334a}.brand em{display:block;font-size:14px;letter-spacing:.3px;margin-top:3px}.brand>span:last-child>span{font-family:Georgia,serif;font-size:29px}.top-note{letter-spacing:.3px;text-transform:none;font-size:14px}.app-layout{grid-template-columns:320px minmax(0,1fr)}aside{background:#30252a}.nav-intro{padding-bottom:10px}.search-label{display:block;font-size:13px;margin-top:18px;color:#eeded5}#reference-search{display:block;width:100%;padding:11px;border:1px solid #8c7576;border-radius:7px;background:#fff;color:#30252a;margin-top:7px;font-size:16px}.nav-intro .search-status{font-size:12px;line-height:1.5;margin-top:10px;color:#d6c4bb}.nav-section h3{font-size:13px;color:#dabd9b;font-weight:600;margin:12px 12px 7px}.nav-section button{display:flex;gap:9px;padding:10px}.entry-number{color:#d5ad78;font-variant-numeric:tabular-nums;width:23px;flex-shrink:0}.nav-section button strong{font-size:13px;display:block;font-weight:600}.entry-snippet{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:13px;line-height:1.45;margin-top:4px;opacity:.85}.nav-section button[aria-current=page]{background:#fff5e7}.nav-section button[aria-current=page] .entry-number{color:#932b3f}nav summary{color:#f0dbcc}nav button:hover{background:#4a373c}.piste-menu{margin-bottom:22px}.piste-menu>summary{font-size:14px;color:#715053;cursor:pointer;padding-bottom:10px}.pistes{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}.pistes button{display:flex;flex-direction:column;align-items:flex-start;text-align:left;gap:5px;border:1px solid #dfd3c6;border-top:3px solid #b49268;border-radius:8px;padding:11px;background:#fffaf2;color:#3c2d32;font:inherit;min-width:0}.pistes button[aria-pressed=true]{border-color:#a4334a;background:#f9e9e9}.pistes strong{font-size:15px;line-height:1.2}.pistes button>span:last-child{font-size:12px;line-height:1.35}.piste-symbol{font:23px Georgia,serif;color:#a4334a}.source-rule{background:#fff;border:1px solid #e0d7ce;border-left:4px solid #a4334a;border-radius:12px;padding:20px 24px;margin:0 0 20px}.source-rule-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:12px;color:#8b3346}.source-rule .rule{border:0;padding:0;font-size:19px;line-height:1.6}.source-correction{font-size:13px;color:#76564c;margin:10px 0 0}.topic-heading{margin-bottom:16px}h1{font-size:clamp(25px,2.5vw,35px)}.results-panel .notice{margin-top:20px;padding-top:15px}.results-panel .insight{padding:0;background:transparent;margin-top:10px;font-size:15px}.topic-footer{flex-wrap:wrap}.topic-footer span{max-width:340px}#tent-dialog{width:min(840px,96vw);max-height:94vh;border:1px solid #bc996f;border-radius:16px;padding:18px;background:#fff8ed}#tent-dialog::backdrop{background:#1b111dcc}.tent-dialog-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:12px;font-weight:600;color:#732537}
@media(max-width:1200px){.app-layout{grid-template-columns:280px minmax(0,1fr)}.workspace{grid-template-columns:1fr}.readout{grid-template-columns:repeat(2,minmax(0,1fr))}.pistes{grid-template-columns:repeat(3,minmax(0,1fr))}.top-note{display:none}}@media(max-width:700px){.app-layout{display:block}.brand>span:last-child>span{font-size:25px}.brand em{font-size:11px}.topbar{gap:7px;padding:0 12px}.topbar #open-tent{font-size:12px;padding:8px}.menu-button{font-size:12px;padding:8px}.pistes{grid-template-columns:repeat(2,minmax(0,1fr))}.piste-menu{margin-bottom:16px}.source-rule{padding:17px}.source-rule .rule{font-size:17px}.topic-heading .eyebrow{line-height:1.5}.readout{grid-template-columns:1fr}.topic-footer{gap:8px}.topic-footer button{font-size:13px}#tent-dialog{padding:10px}}

@media(max-width:480px){.topbar{height:auto;min-height:80px;flex-wrap:wrap;padding:10px 12px}.brand{flex:1 1 175px}.topbar .menu-button{margin-left:auto}}

/* The chosen tent is the entrance to the reference. */
#tent-entrance{display:none;background:#fbf5e9;min-height:100svh;padding:clamp(16px,3vw,48px);color:#432936}
body.at-tent #tent-entrance{display:block}body.at-tent>.topbar,body.at-tent>.app-layout{display:none}
.entrance-layout{max-width:1320px;margin:auto;display:grid;grid-template-columns:minmax(0,1.55fr) minmax(290px,1fr);gap:clamp(24px,4vw,64px);align-items:center}
#tent-entrance #stoicheia-tent-preview{width:100%;min-width:0}
.entrance-copy{padding:24px 0;max-width:450px}.entrance-copy h1{font-family:Georgia,serif;font-size:clamp(42px,5vw,70px);font-weight:normal;color:#742b3c;line-height:1.15;margin:14px 0 0;overflow-wrap:anywhere}
.entrance-latin{font-family:Georgia,serif;font-style:italic;font-size:24px;margin:8px 0 32px;color:#8a6039}
.entrance-copy .entrance-motto{font-family:Georgia,serif;font-size:clamp(23px,2.4vw,32px);line-height:1.35;color:#742b3c}
.entrance-copy>p{line-height:1.65;font-size:17px}.entrance-copy button{display:block;width:100%;min-height:48px;font:inherit;font-size:16px;border-radius:8px;padding:14px 18px;cursor:pointer;text-align:center;margin-top:12px}
.entrance-primary{background:#742b3c;border:1px solid #742b3c;color:#fff7e8}.entrance-primary:hover{background:#582031}.entrance-secondary{background:transparent;border:1px solid #ae8e76;color:#742b3c}.entrance-secondary:hover{background:#f2e6d5}
.entrance-copy .entrance-footnote{font-size:14px;color:#745b52;margin-top:24px}#title:focus{outline:none}
#tent-entrance button:focus-visible{outline:3px solid #ad6b18;outline-offset:4px}
@media(max-width:760px){.entrance-layout{grid-template-columns:minmax(0,1fr);gap:0;max-width:580px}.entrance-copy{max-width:none;padding:16px 8px}.entrance-copy h1{font-size:44px}.entrance-latin{margin-bottom:20px}#tent-entrance{padding:12px}#tent-entrance .tent-toolbar{font-size:14px}#tent-entrance .live-sums{font-size:14px}.entrance-copy .entrance-motto{font-size:26px}}

#tent-entrance .tent-door{position:absolute;bottom:13%;left:50%;transform:translateX(-50%);min-height:48px;padding:12px 22px;border:1px solid #e1bd77;border-radius:8px;background:#742b3c;color:#fff7e8;font:600 16px Arial,sans-serif;white-space:nowrap;cursor:pointer;box-shadow:0 3px 18px #33172150}#tent-entrance .tent-door:hover{background:#582031}

#tent-entrance .tent-door{max-width:90%;white-space:normal;line-height:1.3}

.wisik-return{display:inline-block;color:#742b3c;margin-bottom:16px;text-underline-offset:4px;min-height:44px;padding:10px 0}.topbar .wisik-return{margin:0;padding:10px;white-space:nowrap}

/* Verbinding met het oefendeel van de duotent. */
/* Alleen het kleine lampje knippert; de tekst blijft steeds leesbaar. */
.entrance-practice{display:flex;align-items:center;gap:16px;padding:17px 20px;margin-top:16px;border:2px solid #c5a169;border-radius:10px;color:#fff9ef;background:#742b3c;box-shadow:0 4px 12px #43293624;text-align:left;text-decoration:none;min-height:76px}
.entrance-practice:hover{background:#582031;border-color:#e5bd7a}
.entrance-practice:focus-visible{outline:3px solid #ad6b18;outline-offset:4px}
.practice-label{display:grid;gap:3px;min-width:0;line-height:1.3}
.practice-label strong{font-size:20px;font-weight:700}
.practice-label>span{font-size:15px;color:#ffedd2}
.practice-arrow{margin-left:auto;font-size:30px;line-height:1}
.practice-light{flex:0 0 14px;width:14px;height:14px;border-radius:50%;background:#ffd46b;box-shadow:0 0 0 4px #ffd46b26,0 0 16px #ffd46b99;animation:practice-beacon 1.8s ease-in-out infinite}
@keyframes practice-beacon{0%,40%,100%{opacity:1;box-shadow:0 0 0 4px #ffd46b26,0 0 16px #ffd46b99}50%,90%{opacity:.25;box-shadow:0 0 0 4px #ffd46b0d,0 0 0 #ffd46b00}}
.entrance-practice:hover .practice-light,.entrance-practice:focus-visible .practice-light,#tent-entrance:has([data-pause][aria-pressed="true"]) .practice-light{animation:none}
@media(prefers-reduced-motion:reduce){.practice-light{animation:none}}
.exercise-return{padding:12px 24px;background:#fff3dd;border-bottom:1px solid #bb986b;display:flex;align-items:center;gap:16px;flex-wrap:wrap}.exercise-return a{color:#742b3c;min-height:44px;display:flex;align-items:center}.exercise-return span{font-size:14px;color:#624b40}body.at-tent .exercise-return{display:none}@media(max-width:900px){.topbar{height:auto;min-height:80px;flex-wrap:wrap;padding:10px 12px;gap:10px}.topbar a.soft-button{font-size:13px}.exercise-return{padding:12px 16px;gap:6px}}