.lab-index-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-bottom:48px}
.lab-index-card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:10px;padding:30px;min-width:0;transition:border-color .15s,background .15s}
.lab-index-card:hover{border-color:var(--ink);background:var(--soft)}.lab-index-card h2{display:flex;justify-content:space-between;gap:18px;font-size:29px;letter-spacing:-.035em;margin:22px 0 10px;line-height:1.15}.lab-index-card h2 span{font-size:23px}
.lab-index-card p{color:var(--muted);font-size:16px}.lab-card-action{font-size:13px;margin-top:auto;padding-top:14px;text-decoration:underline;text-underline-offset:4px}
.lab-intro{padding-bottom:36px}.lab-intro h1{font-size:clamp(38px,5vw,68px)}
.lab-panel{border:1px solid var(--line);border-radius:10px;background:var(--paper);padding:30px;min-width:0}.lab-panel h2{font-size:28px;line-height:1.2;letter-spacing:-.03em;margin:0 0 20px}.lab-panel h3{font-size:20px}
.lab-workspace{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:28px;margin:0 0 70px;align-items:start}
.lab-workspace form,.solid-scenario{display:flex;flex-direction:column;gap:12px}.lab-workspace label,.solid-scenario label{font-size:14px;font-weight:500}.lab-workspace fieldset{display:flex;flex-direction:column;gap:12px;border:0;padding:0;margin:8px 0;min-width:0}.lab-workspace legend{font-size:12px;color:var(--muted);margin-bottom:15px}
.lab-workspace :is(input:not([type=checkbox]),select,textarea),.solid-scenario select{width:100%;min-width:0;max-width:100%;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:5px;padding:12px;font:inherit}.lab-workspace textarea{resize:vertical}.lab-workspace input[type=range]{accent-color:var(--ink);padding:0;min-height:36px}
.lab-workspace input[type=file]{font-size:13px;overflow:hidden}.lab-workspace input[type=file]::file-selector-button{border:1px solid var(--line);color:var(--ink);background:var(--soft);padding:8px;border-radius:4px;margin-right:10px}
.lab-note{font-size:13px;line-height:1.75;color:var(--muted)}.lab-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:12px}.lab-actions .button{font-size:14px;padding:13px 18px;min-width:0}
.lab-text-button{border:0;background:transparent;color:var(--ink);font:inherit;font-size:14px;padding:12px 0;text-decoration:underline;text-underline-offset:4px}.lab-text-link{font-size:14px;text-decoration:underline;text-underline-offset:4px}
.lab-workspace [role=status]{font-size:14px;line-height:1.7;min-height:24px}.lab-workspace .lab-checkbox{display:flex;align-items:center;gap:10px;min-height:40px}
.image-pair{display:grid;grid-template-columns:1fr 1fr;gap:18px}.image-pair figure{margin:0;min-width:0}.image-pair figcaption{font-size:14px;margin:12px 0}.image-pair img{display:block;width:100%;height:220px;object-fit:contain;border:1px solid var(--line);border-radius:5px;background:repeating-conic-gradient(#fff 0% 25%,#e8e8e8 0% 50%) 50% / 16px 16px}.image-pair p{font-size:12px;overflow-wrap:anywhere}
.qr-result canvas{display:block;max-width:100%;width:320px;height:auto;background:white;image-rendering:pixelated;margin:22px auto}.qr-result .lab-actions{justify-content:center}
.contrast-colour{display:grid;grid-template-columns:54px 1fr;gap:10px}.contrast-colour>label{grid-column:1/-1}.lab-workspace .contrast-colour input[type=color]{height:48px;padding:5px}.contrast-preview{padding:28px;border:1px solid var(--line);min-height:200px;display:flex;align-items:center;overflow-wrap:anywhere;border-radius:7px}.contrast-preview p{color:inherit;font:inherit;margin:0}
.contrast-ratio{font-size:48px;font-weight:500;letter-spacing:-.04em;margin:25px 0 16px}.contrast-checks{list-style:none;padding:0;display:grid;gap:10px}.contrast-checks li{border-bottom:1px solid var(--line);padding:10px 0;font-size:14px}
.principle-nav{position:static;inset:auto;padding:0;border:0;background:transparent;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin-bottom:24px}.principle-nav button{border:1px solid var(--line);border-radius:7px;background:var(--paper);color:var(--muted);text-align:left;font:inherit;font-size:13px;padding:16px;line-height:1.5}.principle-nav strong{display:block;font-size:28px;color:var(--ink)}.principle-nav button[aria-pressed=true]{border-color:var(--ink);background:var(--soft);color:var(--ink)}
.solid-context{margin-bottom:24px}.solid-context h2{margin-top:15px}.solid-context p{max-width:85ch;font-size:18px;line-height:1.7}.lab-comparison{display:grid;grid-template-columns:1fr 1fr;gap:24px}.lab-comparison .lab-panel{display:flex;flex-direction:column}.lab-comparison pre{background:var(--soft);color:var(--ink);border-radius:6px;padding:20px;overflow:auto;font:12px/1.8 var(--mono);margin-top:14px;flex:1}.lab-comparison pre code{white-space:pre;font:inherit}.lab-comparison p{font-size:16px;line-height:1.75}.solid-scenario{margin-top:24px;margin-bottom:48px}.solid-scenario .lab-comparison{border-top:1px solid var(--line);margin-top:12px}.lab-reading{padding:15px 0 70px}.lab-reading h2{font-size:30px}.lab-article-links{display:flex;flex-wrap:wrap;gap:14px 24px}.lab-article-links a{font-size:14px;text-decoration:underline;text-underline-offset:4px}.article-lab-link{margin:35px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0}.article-lab-link h2{font-size:24px;margin-top:0}.article-lab-link p{font-size:16px;color:var(--muted)}
@media(max-width:1100px){.lab-index-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:950px){.lab-workspace{grid-template-columns:1fr}.principle-nav{grid-template-columns:repeat(3,1fr)}}
@media(max-width:700px){.lab-index-grid,.lab-comparison{grid-template-columns:1fr}.lab-index-card,.lab-panel{padding:22px}.lab-index-card h2{font-size:26px}.principle-nav{grid-template-columns:repeat(2,1fr);gap:10px}.principle-nav button{padding:12px}.image-pair img{height:150px}.lab-intro h1{overflow-wrap:anywhere}.contrast-preview{padding:20px}.lab-workspace{gap:20px}.contrast-ratio{font-size:42px}}