@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');
:root{--ink:#152c3b;--muted:#536978;--line:#dae3e8;--paper:#f4f7f9;--nav:#102936;--teal:#087b71;--q:#1767ac;--k:#a35b08;--v:#7556ad;--cache:#087b71;--state:#b44273;--conv:#8d6715;--mono:'IBM Plex Mono',monospace}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:'DM Sans',system-ui,sans-serif;font-size:16px;line-height:1.55}button,input,select{font:inherit}button,a,input,select,summary{touch-action:manipulation}button{cursor:pointer}a{color:var(--teal);text-underline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #278cda;outline-offset:3px}button{background:white;border:1px solid var(--line);border-radius:6px;color:var(--ink);padding:9px 15px}button:hover{border-color:var(--teal);background:#edf8f5}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(30px,3.2vw,43px);line-height:1.15;letter-spacing:-1.3px;margin-bottom:15px}h2{font-size:23px;line-height:1.25;letter-spacing:-.5px;margin-bottom:12px}h3{font-size:18px;margin-bottom:9px}p{margin-bottom:15px}.small,small{font-size:14px;color:var(--muted)}.eyebrow{font:500 12px/1.5 var(--mono);letter-spacing:1.5px;margin-bottom:10px}.sidebar{position:fixed;inset:0 auto 0 0;width:238px;background:var(--nav);padding:32px 19px;color:#f3f8fa;overflow:auto;z-index:5}.brand{position:relative;display:block;color:white;text-decoration:none;font-size:15px;font-weight:700;line-height:1.15;letter-spacing:2.3px;padding-left:49px;margin:0 8px 37px}.brandmark{position:absolute;left:0;top:0;width:35px;height:38px;color:#66e3c5;border:1px solid #497e80;border-radius:6px;font-size:25px;display:grid;place-items:center;letter-spacing:0}.brand-sub{font-size:23px;letter-spacing:5px}.sidebar>.eyebrow{color:#9eafb8;font-size:10px;letter-spacing:1px;margin-left:12px}.chapter-nav{display:flex;gap:11px;text-decoration:none;color:#b8c8d0;padding:11px;border-radius:7px;font-size:14px;margin:3px 0;align-items:center}.chapter-nav .num{font:12px var(--mono);color:#90a7b5}.chapter-nav.active{background:#214754;color:#b5f3e3}.chapter-nav.active .num{color:#66e3c5}.chapter-nav:hover{background:#1a3b49}.chapter-nav strong{font-weight:500}.sidebar-bottom{border-top:1px solid #31505e;margin-top:28px;padding:23px 10px}.sidebar-bottom p{font-size:19px;line-height:1.45;color:#e3eef0}.sidebar-bottom a{color:#9ccec7;font-size:13px}.sidebar-bottom small{display:block;color:#92a9b4;font-size:11px;margin-top:15px}.page{margin-left:238px}.topbar{height:70px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 40px;font:11px var(--mono);letter-spacing:1px;color:var(--muted)}.slash{color:#9badb8;margin:0 13px}.edition{letter-spacing:0}main{padding:34px 40px 45px;max-width:1510px;margin:auto}.chapter-head{display:flex;justify-content:space-between;gap:30px;align-items:center}.chapter-head .eyebrow{color:var(--teal)}.chapter-head #lede{max-width:690px;color:var(--muted);font-size:16px}.head-glyph{font:28px var(--mono);white-space:nowrap;padding:25px;color:#305469;opacity:.8}.head-glyph span{color:#91b4be;padding:6px}.assumptions{display:flex;gap:0;border:1px solid var(--line);background:#fff;border-radius:6px;overflow:hidden;margin-top:12px;flex-wrap:wrap}.assumptions>span{padding:10px 18px;font-size:13px;border-right:1px solid var(--line)}.assumptions b{font:500 14px var(--mono);margin-right:6px}.assumptions .ideal{margin-left:auto;background:#e4f3ee;color:#176755;font:11px/22px var(--mono);letter-spacing:.5px;border:0}.precision-line{font-size:12px;color:var(--muted);margin:7px 0 22px}.context-panel{background:#fff;border:1px solid var(--line);border-radius:9px;padding:20px 23px;margin-bottom:29px;box-shadow:0 3px 7px #15323d03}.context-top{display:grid;grid-template-columns:1fr 215px;gap:25px;margin-bottom:17px}.context-top label{font-size:12px;color:var(--muted);display:block}.context-top label>span{font-size:10px;margin-left:5px}.context-top select,.context-top input{display:block;margin-top:6px;width:100%;background:#f7f9fa;border:1px solid var(--line);border-radius:5px;color:var(--ink);padding:9px 10px;font:500 14px var(--mono);height:42px}.context-top input{font-size:20px;color:var(--teal)}input[type=range]{width:100%;accent-color:var(--teal);cursor:pointer;height:20px}.context-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:8px}.presets{display:flex;gap:7px;flex-wrap:wrap}.presets button{font:12px var(--mono);padding:6px 10px;border-radius:4px}.presets button.selected{background:var(--teal);color:white;border-color:var(--teal)}#supportStatus{font-size:11px;color:#537064}.warning{color:#985511!important}.main-grid{display:grid;grid-template-columns:minmax(0,1fr) 288px;gap:26px;align-items:start}.lesson{min-width:0}.view-tabs{border-bottom:1px solid var(--line);display:flex;gap:22px;margin-bottom:26px;overflow-x:auto}.view-tabs button{border:0;background:none;border-radius:0;padding:0 0 13px;font-size:14px;white-space:nowrap}.view-tabs button[aria-selected=true]{color:var(--teal);border-bottom:3px solid var(--teal);font-weight:700}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:10px}.section-heading .eyebrow{font-size:10px;letter-spacing:1px;color:var(--muted)}.section-heading h2{font-size:22px}.live-label{font:10px var(--mono);color:var(--teal);background:#e4f3ee;border:1px solid #c5e5dc;padding:4px 7px;white-space:nowrap}.legend{display:flex;gap:12px;font:11px var(--mono);flex-wrap:wrap;margin:17px 0 22px}.legend span{padding-left:8px;border-left:3px solid currentColor}.q{color:var(--q)}.k{color:var(--k)}.v{color:var(--v)}.cache{color:var(--cache)}.state{color:var(--state)}.diagram-intro{background:var(--nav);color:white;padding:17px 20px;border-radius:7px;margin-bottom:12px}.diagram-intro .symbol{color:#95c4c4;font-size:12px}.diagram-intro code{display:block;color:#c5f3e9;font:17px var(--mono);margin-top:6px}.shape-step{border:1px solid var(--line);background:#fff;margin:10px 0;border-radius:7px;position:relative;border-left:3px solid #9daeb7}.shape-step[data-color=q]{border-left-color:var(--q)}.shape-step[data-color=k]{border-left-color:var(--k)}.shape-step[data-color=v]{border-left-color:var(--v)}.shape-step[data-color=cache]{border-left-color:var(--cache)}.shape-step[data-color=state]{border-left-color:var(--state)}.shape-step summary{list-style:none;padding:14px 17px;cursor:pointer}.shape-step summary::-webkit-details-marker{display:none}.step-head{display:flex;gap:10px;align-items:center;margin-bottom:9px;font-size:14px;font-weight:600}.step-head .op-kind{margin-left:auto;font:10px var(--mono);border:1px solid var(--line);padding:2px 5px;border-radius:3px;color:var(--muted);white-space:nowrap}.step-head .expand{color:var(--muted);font-size:17px}.shape-step[open] .expand{transform:rotate(45deg)}.eq{font:13px/1.8 var(--mono);overflow-wrap:anywhere}.sym{font:11px/1.6 var(--mono);color:var(--muted);margin-bottom:3px;overflow-wrap:anywhere}.shape-step .explain{margin:0;padding:0 17px 14px;font-size:14px;color:var(--muted);border-top:1px dashed #e4eaee;padding-top:12px}.flow-connector{text-align:center;color:#82969f;font-size:17px;line-height:12px}.callout{border-left:3px solid var(--teal);background:#eaf5f2;padding:15px 18px;font-size:14px;margin:20px 0}.callout p:last-child{margin-bottom:0}.source-line{font-size:12px;color:var(--muted);margin:16px 0;overflow-wrap:anywhere}.source-line a{margin-right:12px}.ledger{position:sticky;top:20px;border:1px solid #cddbe2;border-radius:9px;background:white;overflow:hidden}.ledger-head{background:#eaf0f3;padding:20px 21px 12px}.ledger-head .eyebrow{font-size:10px;color:#496474}.ledger-head h2{font-size:21px;margin-bottom:8px}.ledger-head p:last-child{font:12px var(--mono);color:var(--muted)}#memory{padding:8px 20px 20px}.mem-row{padding:13px 0;border-bottom:1px solid #e7edf0}.mem-label{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.mem-label b{font-weight:500;color:var(--ink)}.mem-value{font:500 20px var(--mono);margin:4px 0;color:var(--ink)}.mem-detail{font:10px/1.65 var(--mono);color:var(--muted);overflow-wrap:anywhere}.mem-total{margin:16px -7px 13px;background:var(--nav);color:#fff;border-radius:6px;padding:15px 12px}.mem-total .mem-label,.mem-total .mem-detail{color:#a7c2cd}.mem-total .mem-value{color:#b2efda;font-size:23px}.ledger-note{font-size:12px;line-height:1.55;color:var(--muted);margin-top:15px}.weight-toggle{font-size:12px;line-height:1.5;display:flex;gap:7px;margin:16px 0}.weight-toggle input{accent-color:var(--teal);margin:3px}.memory-bar{height:7px;display:flex;border-radius:5px;overflow:hidden;margin:12px 0}.memory-bar span{min-width:0}.growth{font:12px/1.8 var(--mono);padding:12px;background:#f1f6f8;border-radius:5px}.source-figure{background:#fff;border:1px solid var(--line);padding:20px;border-radius:8px;margin-top:26px}.source-figure h3{font-size:18px}.source-figure img{display:block;width:100%;max-height:420px;object-fit:contain;background:white;padding:8px}.source-figure figcaption{font-size:12px;line-height:1.6;color:var(--muted);margin-top:13px}.source-figure figure{margin:0}.source-figure .figure-intro{font-size:14px}.source-figure a{font-size:13px}.figure-link{display:block;padding:15px;background:#f2f6f8;border-radius:5px;margin:12px 0}.read-block{margin-bottom:24px}.read-block h2{font-size:25px}.read-block p{font-size:16px}.read-block .formula{background:var(--nav);color:#d3f1e9;padding:18px;border-radius:6px;font:14px/1.9 var(--mono);overflow-wrap:anywhere;margin:18px 0}.lesson-details{border-top:1px solid var(--line);padding:15px 0;font-size:14px}.lesson-details summary{font-size:16px;font-weight:600;cursor:pointer}.lesson-details p{margin:13px 0 0}.model-details,.method{margin-top:35px;border-top:1px solid var(--line);padding-top:24px}.model-details>details>summary,.method>details>summary{font-weight:600;font-size:19px;cursor:pointer}.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;border:1px solid var(--line);background:var(--line);margin-top:20px}.spec{padding:13px;background:white;font-size:12px;color:var(--muted);overflow-wrap:anywhere}.spec b{display:block;font:500 16px var(--mono);color:var(--ink);margin-top:4px}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13px;margin:15px 0}th,td{padding:10px 9px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}th{font-size:12px;color:var(--muted);font-weight:500}td.n{font-family:var(--mono);text-align:right}.chapter-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);margin-top:30px;padding-top:25px}.chapter-footer span{font:12px var(--mono);color:var(--muted)}.chapter-footer button:disabled{opacity:.45;cursor:default}footer{border-top:1px solid var(--line);padding:22px 40px;font-size:12px;display:flex;gap:20px}footer span{color:var(--muted)}footer a{margin-left:auto}.compare-controls{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.compare-controls button.active{color:white;background:var(--teal)}.chart-container{background:white;border:1px solid var(--line);border-radius:7px;padding:16px 9px}.chart-container svg{width:100%;height:auto;display:block}.chart-legend{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;margin:12px}.chart-legend button{font-size:11px;padding:4px 7px;text-align:left;border-color:transparent;display:flex;align-items:center;gap:7px}.chart-legend button.off{opacity:.45}.chart-legend i{width:17px;height:3px;display:inline-block}.stack{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;margin:16px 0}.stack button{font:11px/1.5 var(--mono);padding:8px 2px;background:#f9edf2;color:var(--state);border-color:#dfbfd0}.stack button.full{background:#e4f1f2;color:var(--teal);border-color:#afd5ce}.stack button.active{outline:2px solid var(--ink);outline-offset:1px}.stack-caption{font-size:13px;color:var(--muted)}.layer-type-tabs{display:flex;gap:8px;margin-bottom:15px}.layer-type-tabs button{font-size:13px}.layer-type-tabs button.active{background:var(--nav);color:white}.sub-heading{margin:24px 0 15px}.tests{display:grid;gap:8px;margin:14px 0}.test{font-size:13px;color:#206a55}.test::before{content:'✓';margin-right:9px}.test.fail{color:#9f3030}.skip{position:fixed;top:-70px;left:255px;z-index:20;padding:12px;background:white}.skip:focus{top:8px}.formula-inline{font-family:var(--mono);font-size:14px}.method p{max-width:950px}.method details details{margin-top:17px}.notice{color:#855510;background:#fff5dc;padding:12px;border-radius:5px;font-size:13px}.width-note{font-size:12px;color:var(--muted)}.status-pill{background:#e4f3ee;color:#216c5b;padding:4px 8px;border-radius:4px;font:11px var(--mono)}@media(min-width:1500px){.main-grid{grid-template-columns:minmax(0,1fr) 320px}.eq{font-size:15px}.sym{font-size:12px}}@media(max-width:1150px){.sidebar{width:202px;padding:25px 12px}.page{margin-left:202px}main{padding:28px 25px}.topbar{padding:0 25px}.main-grid{grid-template-columns:minmax(0,1fr) 255px;gap:20px}.head-glyph{display:none}.edition{display:none}.assumptions>span{padding:8px 10px}.assumptions .ideal{margin-left:0}.step-head{flex-wrap:wrap}.step-head .op-kind{font-size:9px}.eq{font-size:12px}.view-tabs{gap:15px}.view-tabs button{font-size:12px}.spec-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:900px){.sidebar{position:relative;width:100%;padding:16px 20px}.brand{margin:0 0 16px;font-size:11px;min-height:32px;padding-left:43px}.brand-sub{font-size:17px;letter-spacing:4px}.brandmark{height:32px;width:30px;font-size:22px}.sidebar>.eyebrow,.sidebar-bottom{display:none}#chapters{display:flex;overflow-x:auto;gap:5px}.chapter-nav{padding:8px 10px;white-space:nowrap;gap:7px;font-size:12px}.chapter-nav .num{font-size:10px}.page{margin:0}.topbar{height:48px;padding:0 22px;font-size:10px}main{padding:25px 22px}.main-grid{grid-template-columns:minmax(0,1fr) 265px}.skip{left:15px}.context-top{grid-template-columns:1fr 200px}.spec-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:680px){body{font-size:16px}.main-grid{grid-template-columns:1fr}.ledger{position:static;grid-row:2}.context-top{grid-template-columns:1fr}.context-panel{padding:17px}.context-top{gap:12px}.context-top select{font-size:12px}.context-top label>span{font-size:11px}.context-top input{font-size:22px}.context-bottom{align-items:flex-start}.assumptions{gap:0}.assumptions>span{font-size:12px;flex:1 1 45%;border-bottom:1px solid var(--line)}.assumptions b{font-size:13px}.assumptions .ideal{flex:1 1 45%;font-size:10px;line-height:20px}.eq{font-size:12px}.sym{font-size:11px}.view-tabs{justify-content:space-between;gap:10px}.view-tabs button{font-size:12px}.live-label{display:none}.section-heading h2{font-size:23px}.legend{font-size:10px;gap:10px}h1{font-size:33px}#lede{font-size:15px!important}.precision-line{font-size:11px}.model-details,.method{margin-top:25px}.spec-grid{grid-template-columns:repeat(2,1fr)}.spec b{font-size:14px}.source-figure{padding:16px}.stack{grid-template-columns:repeat(8,1fr);gap:4px}.stack button{font-size:10px}.chapter-footer span{display:none}.chapter-footer button{font-size:12px}.chart-legend{grid-template-columns:repeat(2,1fr);margin:6px}.chart-legend button{font-size:10px;padding:3px}.ledger .mem-row{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:6px}.ledger .mem-row .mem-detail{grid-column:2}.ledger .mem-value{font-size:19px;margin:0}.mem-total .mem-value{margin:8px 0;font-size:24px}.ledger .mem-label{font-size:13px}.mem-detail{font-size:11px}footer{padding:22px;flex-wrap:wrap}footer span{display:none}footer a{margin-left:auto}.context-top input,.context-top select{min-width:0}.topbar{font-size:9px;letter-spacing:.5px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}[hidden]{display:none!important}
/* Keep working controls and equations legible at narrow widths. */
.view-tabs button,.context-top label,.presets button{font-size:14px}.context-top label>span{font-size:12px}.eq{font-size:14px}.step-head{font-size:15px}.chart-legend button{font-size:12px}.presets{gap:6px}.context-top select{font-size:13px}.presets button{padding:5px 9px}@media(max-width:680px){.eq{font-size:13px}.view-tabs button{font-size:13px}.presets button{font-size:12px}.legend{font-size:12px}.context-top select{font-size:12px}}
.chart-container{overflow-x:auto}.chart-container svg{min-width:610px}.chart-container .chart-legend{min-width:0}@media(max-width:680px){.chart-container:after{content:'Scroll chart horizontally; exact values are in the table below.';display:block;font-size:12px;color:var(--muted);margin:10px}}
.source-figure img{height:auto}
.checkpoint-config{background:#fff;border:1px solid #bfd0db;border-top:4px solid #1767ac;border-radius:9px;padding:24px;margin:0 0 28px;scroll-margin-top:20px}.config-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:18px}.config-heading .eyebrow{color:var(--q)}.config-heading h2{font-size:clamp(20px,2vw,27px);overflow-wrap:anywhere;margin-bottom:7px}.config-deck{color:var(--muted);margin-bottom:12px}.config-verified{font:12px/1.5 var(--mono);color:#205772;background:#e7f1f7;border:1px solid #c7deea;border-radius:5px;padding:6px 9px;white-space:nowrap}.config-links{display:flex;gap:10px 20px;flex-wrap:wrap;font-size:14px}.config-revision{font-size:12px;color:var(--muted);margin:12px 0 20px;overflow-wrap:anywhere}.config-revision code{font-family:var(--mono)}.config-badges{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden;margin-bottom:23px}.config-badges>div{padding:12px 15px;background:#f3f8fb}.config-badges span{display:block;font-size:14px;color:var(--muted)}.config-badges strong{display:block;font:500 24px/1.6 var(--mono);color:#164c70}.config-evidence{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:28px;align-items:start}.config-evidence h3{font-size:18px}.config-evidence>div>p{font-size:14px;color:var(--muted)}.config-json{margin:12px 0;background:#102936;color:#e2f2fa;padding:18px;border-radius:6px;white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.8 var(--mono);tab-size:2;max-height:none}.config-json code{font:inherit}.config-caution{border-left:3px solid #98b6cb;padding-left:12px}.config-full{border-top:1px solid var(--line);padding-top:14px;margin-top:16px}.config-full summary{font-size:15px;font-weight:600;cursor:pointer}.config-full p{font-size:14px;margin:12px 0}.config-full .config-json{max-height:560px;overflow:auto}.config-derivation{border-left:3px solid #c8dce8;padding:0 0 0 14px;margin:0 0 19px}.config-derivation h4{margin:0 0 5px;font-size:15px}.config-derivation>code{display:block;font:500 14px/1.75 var(--mono);color:#16577f;overflow-wrap:anywhere}.config-derivation p{font-size:14px;color:var(--muted);line-height:1.65;margin:7px 0 0}.config-accounting{border-top:1px solid var(--line);padding-top:16px;font-size:14px;color:var(--muted);margin:18px 0}.config-figures{border-top:1px solid var(--line);padding-top:4px}.config-figures .source-figure{margin:18px 0 0;background:#f7fafc;padding:20px}.config-figures .source-figure img{max-height:360px;object-fit:contain;width:100%;background:white}.config-figures figure{margin:16px 0 0}.config-figures figcaption{font-size:13px;line-height:1.6;margin-top:12px;color:var(--muted)}.config-to-math{border-top:1px solid var(--line);margin-top:22px;padding:16px 0 0;font-size:15px}.config-jump{font-size:14px;margin-top:8px}.config-extra{border-top:1px solid var(--line);padding-top:12px}.config-extra summary{cursor:pointer;font-size:15px;font-weight:600;margin-bottom:15px}@media(max-width:1100px){.config-evidence{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}.config-json{font-size:13px;padding:14px}}@media(max-width:720px){.checkpoint-config{padding:17px}.config-heading{display:block}.config-verified{display:inline-block;margin-bottom:16px}.config-badges{grid-template-columns:repeat(2,minmax(0,1fr))}.config-evidence{grid-template-columns:1fr}.config-json{font-size:14px}.config-figures .source-figure{padding:15px}.config-links{gap:10px 15px}.config-figures .source-figure img{max-height:none}}
.live-shapes{background:#fff;border:1px solid #b5d9d3;border-top:4px solid var(--teal);border-radius:8px;margin:0 0 30px;padding:23px}.live-title{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:18px}.live-title .eyebrow{color:var(--teal)}.live-title h2{margin:0}.live-key{font:12px var(--mono);color:#166957;background:#d9f2e9;padding:6px 10px;border-radius:4px}.live-products{display:grid;grid-template-columns:1fr 1fr;gap:14px}.live-product{padding:17px;background:#f4f8fa;border:1px solid var(--line);border-radius:6px;min-width:0}.live-product h3{font-size:16px;line-height:1.4}.live-product p{font-size:14px;color:var(--muted);margin:13px 0 0}.live-equation{font:500 clamp(14px,1.4vw,19px)/2.1 var(--mono);margin-top:10px;overflow-wrap:anywhere}.dim-live{background:#cef0e3;color:#095f4c;padding:2px 3px;border-radius:3px;box-decoration-break:clone}.operator{color:#81909a}.live-footnote,.live-fixed,.live-explanation{grid-column:1/-1;font-size:14px;margin:0;color:var(--muted)}.live-fixed{background:#edf5f4;border-left:3px solid var(--teal);padding:12px 15px}.live-fixed b{color:var(--ink)}.live-fixed p{margin:5px 0 0}.live-explanation{margin-top:16px}.reading-guide{padding:18px;background:#e9f3f0;border-radius:6px;margin-bottom:20px}.reading-guide p{font-size:15px;margin:8px 0 0}.symbol-guide{border:1px solid var(--line);padding:15px 18px;background:white;border-radius:6px;margin:0 0 25px}.symbol-guide summary{font-size:15px;font-weight:600;cursor:pointer}.symbol-guide dl{margin:15px 0 0}.symbol-guide dl>div{margin:0 0 15px}.symbol-guide dt{font:500 14px var(--mono);color:var(--teal)}.symbol-guide dd{margin:5px 0 0;font-size:15px;color:var(--muted)}.teaching-section{margin:28px 0}.teaching-section h3{font-size:21px;line-height:1.35;margin-bottom:12px}.teaching-section p,.worked-story p{font-size:16px;line-height:1.75}.worked-story{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:6px;padding:20px;margin:25px 0}.worked-story h3{font-size:20px;line-height:1.4}.worked-story .eyebrow{font:11px var(--mono);color:var(--teal)}.worked-story .formula,.teaching-section .formula{font-size:13px;line-height:1.9}.memory-explanation{background:#eaf3f8;padding:18px;border-radius:7px;margin:28px 0}.memory-explanation p{font-size:15px!important;margin-bottom:10px}.memory-explanation p:last-child{margin:0}.trace-cta{background:var(--teal);color:white;margin-top:23px}.trace-cta:hover{background:#086759;color:white}.shape-step[open] .explain{line-height:1.7;font-size:15px}.view-tabs{gap:17px}.view-tabs button{font-size:14px}@media(max-width:1000px){.live-products{grid-template-columns:1fr}.live-equation{font-size:17px}}@media(max-width:680px){.live-shapes{padding:16px}.live-title{display:block}.live-key{display:inline-block;margin-top:12px}.live-equation{font-size:15px}.live-product{padding:13px}.teaching-section h3{font-size:20px}.worked-story{padding:16px}.worked-story .formula,.teaching-section .formula{font-size:12px}.view-tabs button{font-size:12px}.view-tabs{gap:10px}.live-title h2{font-size:22px}}

.config-actions{display:flex;flex-direction:column;align-items:flex-end;gap:10px}.config-matmuls{font-size:14px;white-space:nowrap}.config-figures img[src*="deltanet-fig2"]{max-height:540px}@media(max-width:720px){.config-actions{align-items:flex-start;gap:5px;margin-bottom:15px}.config-actions .config-verified{margin-bottom:5px}}

/* Pytorcher publication identity. */
.brand{padding-left:44px;letter-spacing:0}.brand-parent{display:block;font-size:12px;font-weight:700;letter-spacing:1px;line-height:1.3}.brand-domain{font-size:10px;letter-spacing:0;color:#9ccbc5}.brand-sub{display:block;font-size:19px;letter-spacing:-.4px;line-height:1.25;margin-top:4px}.guide-subtitle{font-size:15px;color:var(--muted);margin:0 0 24px}footer strong{font-size:14px;font-weight:600}footer span{font-size:13px;max-width:340px}@media(max-width:1150px) and (min-width:901px){.brand{margin-left:3px;margin-right:0}.brand-parent{font-size:11px;letter-spacing:.6px}.brand-sub{font-size:17px}}@media(max-width:900px){.brand{min-height:37px}.brand-parent{font-size:12px}.brand-sub{font-size:18px}.brandmark{height:37px}.guide-subtitle{font-size:14px;margin-bottom:22px}}