.knowledgeShapesPage {
    --knowledge-paper: #fffdf9;
    --knowledge-ink: #342b26;
    --knowledge-muted: #756a61;
    --knowledge-accent: #6b4c36;
    --knowledge-line: #ddd3c8;
    background: #fff;
    color: var(--knowledge-ink);
    padding-bottom: 64px;
}

.knowledgeShapesPage [hidden] { display: none !important; }

.knowledgeHero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 58px;
    align-items: end;
    border-bottom: 1px solid var(--knowledge-line);
    padding: 52px 0 46px;
}

.knowledgeEyebrow,
.shapeLibraryHead > div > span,
.shapeSectionHead > span,
.shapeSources > div:first-child > span {
    color: #927158;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.7px;
}

.knowledgeHero h1 {
    max-width: 760px;
    color: var(--knowledge-ink);
    font-size: clamp(36px, 4.2vw, 58px);
    font-weight: 500;
    letter-spacing: -.04em;
    line-height: 1.08;
    margin: 15px 0 20px;
    text-wrap: balance;
}

.knowledgeHero p {
    max-width: 760px;
    color: var(--knowledge-muted);
    font-size: 15px;
    line-height: 1.9;
    margin: 0;
}

.knowledgeHero aside {
    border-left: 1px solid #cdbdad;
    padding: 4px 0 4px 28px;
}

.knowledgeHero aside span,
.knowledgeHero aside small { display: block; color: #8a7e73; }
.knowledgeHero aside strong { display: block; color: var(--knowledge-accent); font-size: 38px; font-weight: 500; line-height: 1.2; margin: 5px 0; }
.knowledgeHero aside small { font-size: 11px; line-height: 1.6; }

.knowledgeSteps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border: 1px solid var(--knowledge-line);
    margin-top: 36px;
}

.knowledgeSteps article {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 8px;
    min-width: 0;
    padding: 24px 24px 26px;
}

.knowledgeSteps article + article { border-left: 1px solid var(--knowledge-line); }
.knowledgeSteps b { color: #a18269; font-size: 12px; font-weight: 500; padding-top: 2px; }
.knowledgeSteps h2 { font-size: 15px; font-weight: 600; margin: 0 0 7px; }
.knowledgeSteps p { color: var(--knowledge-muted); font-size: 12px; line-height: 1.65; margin: 0; }

.shapeLibrary { margin-top: 64px; }
.shapeLibraryHead { display: flex; gap: 30px; align-items: end; justify-content: space-between; border-bottom: 1px solid var(--knowledge-line); padding-bottom: 26px; }
.shapeLibraryHead h2,
.shapeSectionHead h2,
.shapeSources h2 { color: var(--knowledge-ink); font-size: 29px; font-weight: 500; letter-spacing: -.02em; line-height: 1.3; margin: 8px 0 9px; }
.shapeLibraryHead p { max-width: 700px; color: var(--knowledge-muted); font-size: 13px; line-height: 1.75; margin: 0; }
.shapeLibraryHead > a { flex: 0 0 auto; color: var(--knowledge-accent); font-size: 12px; font-weight: 600; text-decoration: none; }
.shapeLibraryHead > a:hover { text-decoration: underline; }

.shapeFinder { display: grid; grid-template-columns: auto minmax(220px, 520px) 1fr; gap: 16px; align-items: center; margin: 28px 0 16px; }
.shapeFinder label { font-size: 13px; font-weight: 600; }
.shapeFinder input { box-sizing: border-box; width: 100%; border: 1px solid #cfc3b7; border-radius: 0; background: #fff; color: var(--knowledge-ink); font: inherit; padding: 13px 15px; }
.shapeFinder input:focus { border-color: var(--knowledge-accent); outline: 3px solid rgba(107,76,54,.14); outline-offset: 1px; }
.shapeFinder span { justify-self: end; color: var(--knowledge-muted); font-size: 12px; font-variant-numeric: tabular-nums; }

.knowledgeShapesPage .shapeQuickFilters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.knowledgeShapesPage .shapeQuickFilters button { border: 1px solid #d5c9bd; border-radius: 0; background: #fff; color: #655a51; cursor: pointer; font: inherit; font-size: 12px; padding: 9px 12px; transition: background-color .2s ease, border-color .2s ease, color .2s ease; }
.knowledgeShapesPage .shapeQuickFilters button:hover,
.knowledgeShapesPage .shapeQuickFilters button.is-active { border-color: var(--knowledge-accent); background: #f0e8df; color: #4f3828; }
.knowledgeShapesPage .shapeQuickFilters button:active { transform: translateY(1px); }
.knowledgeShapesPage .shapeQuickFilters button:focus-visible,
.shapeSelect input:focus-visible { outline: 3px solid rgba(107,76,54,.22); outline-offset: 2px; }

.shapeCompare { border: 1px solid var(--knowledge-line); background: #faf6f1; margin-bottom: 24px; padding: 20px; }
.shapeCompare > p { color: var(--knowledge-muted); font-size: 12px; line-height: 1.7; margin: 0; }
.shapeCompareMessage { color: #754a2f !important; margin-bottom: 14px !important; }
.shapeCompareGrid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--knowledge-line); }
.shapeCompareGrid article { min-width: 0; background: #fff; padding: 20px; }
.shapeCompareGrid span { color: #9a785e; font-size: 10px; letter-spacing: 1px; }
.shapeCompareGrid h3 { font-size: 18px; font-weight: 500; margin: 7px 0 14px; }
.shapeCompareGrid dl { font-size: 12px; line-height: 1.65; margin: 0; }
.shapeCompareGrid dt { color: #59463a; font-weight: 600; margin-top: 9px; }
.shapeCompareGrid dd { color: var(--knowledge-muted); margin: 3px 0 0; }

.knowledgeShapesPage .shapeGrid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border: 1px solid #e3dcd4; background: #e3dcd4; }
.knowledgeShapesPage .shapeGrid > article { display: flex; min-width: 0; min-height: 0; flex-direction: column; border: 0; background: var(--knowledge-paper); padding: 22px; }
.shapeImage { display: flex; height: 112px; align-items: center; justify-content: center; border-bottom: 1px solid #e4dbd1; background: #fff; margin: -22px -22px 20px; padding: 17px; }
.shapeImage img { display: block; width: auto; max-width: 100%; height: auto; max-height: 72px; }
.shapeFamily { color: #9a785e; font-size: 10px; font-weight: 600; letter-spacing: 1px; }
.shapeGrid h3 { color: var(--knowledge-ink); font-size: 19px; font-weight: 500; line-height: 1.35; margin: 8px 0 11px; }
.shapeFeature { color: #5f554d; font-size: 12px; line-height: 1.75; margin: 0 0 8px; }
.shapeDecisionList { border-top: 1px solid #e6ddd3; color: var(--knowledge-muted); font-size: 11px; line-height: 1.58; margin: 8px 0 0; padding-top: 4px; }
.shapeDecisionList dt { color: #584332; font-weight: 600; margin-top: 9px; }
.shapeDecisionList dd { margin: 3px 0 0; }
.shapeReference { border-top: 1px solid #e7ded4; margin-top: 16px; padding-top: 13px; }
.shapeReference > strong { display: block; color: #584332; font-size: 11px; font-weight: 600; }
.shapeReference > p,
.shapeReference details p { color: var(--knowledge-muted); font-size: 11px; line-height: 1.58; margin: 4px 0 0; }
.shapeReference details { margin-top: 9px; }
.shapeReference summary { display: inline-flex; align-items: center; color: #6b4c36; cursor: pointer; font-size: 11px; font-weight: 600; list-style: none; }
.shapeReference summary::-webkit-details-marker { display: none; }
.shapeReference summary::after { content: "＋"; font-size: 12px; font-weight: 400; margin-left: 6px; }
.shapeReference details[open] summary::after { content: "－"; }
.shapeSelect { display: flex; gap: 8px; align-items: center; margin-top: auto; color: #604533; cursor: pointer; font-size: 12px; font-weight: 600; padding-top: 18px; }
.shapeSelect input { accent-color: var(--knowledge-accent); }
.shapeEmpty { border: 1px dashed #cbbcae; background: #fffaf4; color: var(--knowledge-muted); font-size: 13px; line-height: 1.7; margin: 0; padding: 28px; text-align: center; }

.stemSection { border-top: 1px solid var(--knowledge-line); margin-top: 58px; padding-top: 40px; }
.stemSection > .shapeSectionHead { max-width: 760px; margin-bottom: 24px; }
.shapeSources { display: grid; grid-template-columns: minmax(220px,.8fr) minmax(0,2.2fr); gap: 38px; border-top: 1px solid var(--knowledge-line); margin-top: 58px; padding-top: 40px; }
.shapeSectionHead > p { color: var(--knowledge-muted); font-size: 12px; line-height: 1.75; margin: 0; }
.knowledgeShapesPage .stemSection > .stemGuide { display: block; min-width: 0; }
.stemSteps { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1px; border: 1px solid var(--knowledge-line); background: var(--knowledge-line); }
.stemSteps article { display: grid; grid-template-columns: 26px minmax(0,1fr); gap: 8px; border: 0; background: #fff; padding: 19px 18px 20px; }
.stemSteps b { color: #9a785e; font-size: 12px; font-weight: 500; padding-top: 2px; }
.stemSteps h3 { font-family: inherit; font-size: 14px; font-weight: 600; line-height: 1.45; margin: 0 0 7px; }
.stemSteps p,
.shapeNaming p,
.shapeSources p,
.shapeSources li { color: var(--knowledge-muted); font-size: 12px; line-height: 1.75; }
.stemSteps p { margin: 0; }
.stemLookup { border: 1px solid var(--knowledge-line); border-top: 0; background: #fff; }
.stemLookupHead,
.stemLookupRow { display: grid; grid-template-columns: .8fr .8fr 1fr 1.6fr; gap: 0; align-items: center; }
.stemLookupHead { background: #f4eee7; color: #695647; font-size: 11px; font-weight: 600; }
.stemLookupHead > span,
.stemLookupRow > span,
.stemLookupRow > strong { min-width: 0; padding: 11px 13px; }
.stemLookupRow { border-top: 1px solid #e9e0d7; color: #6d6259; font-size: 12px; line-height: 1.55; }
.stemLookupRow strong { color: #4f3828; font-weight: 600; }
.stemLookupRow > * + * { border-left: 1px solid #eee6de; }

.shapeNaming { border-top: 1px solid var(--knowledge-line); margin-top: 58px; padding-top: 40px; }
.shapeNaming > .shapeSectionHead { max-width: 760px; }
.shapeNamingGrid { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 1px; border: 1px solid var(--knowledge-line); background: var(--knowledge-line); margin-top: 24px; }
.shapeNamingGrid article { min-width: 0; background: #fff; padding: 18px; }
.shapeNamingGrid article > span { color: #9a785e; font-size: 10px; font-weight: 600; letter-spacing: .8px; }
.shapeNamingGrid h3 { color: #44352b; font-size: 15px; font-weight: 600; margin: 7px 0 8px; }
.shapeNamingGrid p { margin: 0; }
.shapeSources h2 { margin-top: 8px; }
.shapeSources p { margin: 0 0 12px; }
.shapeSources ul { margin: 0 0 14px; padding-left: 18px; }
.shapeSources a { color: var(--knowledge-accent); }

.knowledgeFeatureSection { border: 1px solid #d9cfc4; background: #fbf7f2; margin: 0 0 30px; padding: 26px 28px; }
.knowledgeFeatureSection > span { color: #9a785e; font-size: 11px; font-weight: 600; letter-spacing: 1.4px; }
.knowledgeFeatureSection h1 { color: #352c27; font-size: 26px; font-weight: 500; margin: 7px 0 9px; }
.knowledgeFeatureSection p { max-width: 760px; color: #756a61; font-size: 13px; line-height: 1.75; margin: 0 0 18px; }
.knowledgeFeatureSection a { display: inline-block; background: #654733; color: #fff; font-size: 12px; font-weight: 600; padding: 11px 16px; text-decoration: none; transition: background-color .2s ease; }
.knowledgeFeatureSection a:hover { background: #503724; }

@media (max-width: 900px) {
    .knowledgeHero { grid-template-columns: 1fr; gap: 28px; }
    .knowledgeHero aside { border-left: 0; border-top: 1px solid var(--knowledge-line); padding: 20px 0 0; }
    .knowledgeShapesPage .shapeGrid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .shapeSources { grid-template-columns: 1fr; gap: 22px; }
    .stemSteps { grid-template-columns: 1fr; }
    .shapeNamingGrid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 640px) {
    .knowledgeShapesPage { padding-bottom: 42px; }
    .knowledgeHero { padding: 34px 0 30px; }
    .knowledgeHero h1 { font-size: 36px; }
    .knowledgeSteps { grid-template-columns: 1fr; }
    .knowledgeSteps article + article { border-left: 0; border-top: 1px solid var(--knowledge-line); }
    .shapeLibrary { margin-top: 46px; }
    .shapeLibraryHead { display: block; }
    .shapeLibraryHead > a { display: inline-block; margin-top: 16px; }
    .shapeFinder { grid-template-columns: 1fr; gap: 9px; }
    .shapeFinder span { justify-self: start; }
    .knowledgeShapesPage .shapeQuickFilters { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 7px; }
    .knowledgeShapesPage .shapeQuickFilters button { flex: 0 0 auto; }
    .knowledgeShapesPage .shapeGrid,.shapeCompareGrid { grid-template-columns: 1fr; }
    .shapeCompareGrid article + article { border-top: 1px solid var(--knowledge-line); }
    .stemLookup { border-top: 1px solid var(--knowledge-line); }
    .stemLookupHead { display: none; }
    .stemLookupRow { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px 16px; padding: 15px 16px; }
    .stemLookupRow > span,
    .stemLookupRow > strong { border-left: 0; padding: 0; }
    .stemLookupRow > *::before { display: block; content: attr(data-label); color: #9a785e; font-size: 9px; font-weight: 600; letter-spacing: .7px; margin-bottom: 3px; }
    .shapeNamingGrid { grid-template-columns: 1fr; }
    .knowledgeFeatureSection { padding: 22px 20px; }
}