:root{color:#242724;font-synthesis:none;--green:#3e8126;--surface:#c9cbc6;--parchment:#d4c099;--line:#676b62;--bevel:inset 2px 2px #f5f6f2,inset -2px -2px #92988b;background:#b3b5b1;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0}button,input,summary{font:inherit}button,summary{cursor:pointer}button{border:2px solid var(--line);background:var(--surface);min-height:44px;color:inherit;box-shadow:var(--bevel);justify-content:center;align-items:center;gap:8px;padding:8px 14px;display:inline-flex}button:hover{background:#dfe4d6}button:active{box-shadow:inset 2px 2px #868b80}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline-offset:3px;outline:3px solid #284ea5}a{color:#28551c;text-underline-offset:4px}h1,h2,h3,h4,p,figure{margin:0}p{line-height:1.75}small{font-size:12px}button.primary{background:var(--green);color:#fff;border-color:#2d5d1e;box-shadow:inset 2px 2px #80a86a,inset -2px -2px #2d5d1e}.icon{flex:none;width:20px;height:20px}.skip{z-index:50;background:#fff;padding:12px;position:fixed;top:-100px;left:10px}.skip:focus{top:8px}.site-header{height:80px;box-shadow:var(--bevel);background:var(--surface);border:3px solid #62675b;justify-content:space-between;align-items:center;gap:12px;padding:0 36px;display:flex}.brand{letter-spacing:2px;white-space:nowrap;align-items:center;gap:12px;font-size:23px;font-weight:800;text-decoration:none;display:flex}.brand img{width:34px;height:34px}.header-actions{align-items:center;gap:18px;display:flex}.segmented{gap:5px;display:inline-flex}.segmented button[aria-pressed=true],.filters button[aria-pressed=true]{color:#28551c;outline-offset:-5px;background:#dde6d4;border-color:#3b7028;outline:1px solid #3b7028;font-weight:700}.settings{position:relative}.settings summary{align-items:center;min-height:44px;padding:8px;display:flex}.settings-panel{z-index:4;border:2px solid var(--line);background:#e0e2db;width:270px;padding:20px;position:absolute;top:50px;right:0;box-shadow:4px 4px #52584c55}.settings-panel label{align-items:center;gap:8px;min-height:44px;display:flex}.settings-panel p{margin-top:12px;font-size:12px}.museum{max-width:1560px;margin:auto;padding:26px 32px 32px}.hero{background:var(--parchment);border:2px solid #9b8257;justify-content:space-between;align-items:center;gap:20px;margin-bottom:26px;padding:18px 28px;display:flex;box-shadow:inset 2px 2px #eddfbd,4px 4px #80765355}.eyebrow{letter-spacing:2px;color:#586545;margin-bottom:8px;font-size:12px;font-weight:700}.hero h1{letter-spacing:1px;margin:6px 0 10px;font-size:30px}.hero p{color:#4b503f}.hero img{object-fit:contain;width:235px;height:110px}.discovery-controls{justify-content:space-between;gap:18px;margin-bottom:16px;display:flex}.search{border:2px solid var(--line);background:#e4e6df;flex:1;align-items:center;gap:10px;max-width:620px;padding:0 12px;display:flex;box-shadow:inset 2px 2px #8a9181}.search input{outline-offset:-3px;background:0 0;border:none;width:100%;min-width:0;min-height:48px}.search>button{white-space:nowrap;box-shadow:none;background:0 0;border:none;padding:4px 8px}.filters{flex-wrap:wrap;gap:8px;margin:0 0 22px;display:flex}.filters button{min-height:40px;padding:8px 10px;font-size:12px}.filters button span{width:9px;height:9px}.table-intro{align-items:center;gap:18px;margin-bottom:12px;display:flex}.table-intro h2{font-size:18px}.table-intro span{color:#545c50;font-size:12px}.swipe-hint{display:none}.table-scroll{scrollbar-color:#786 #c8cec1;background:#a7aca1;border:2px solid #72796a;padding:12px;overflow-x:auto;box-shadow:inset 2px 2px #858d7c}.periodic{grid-template-rows:22px repeat(7,68px) 12px repeat(2,68px);grid-template-columns:20px repeat(18,minmax(48px,1fr));gap:5px;min-width:1050px;display:grid}.element-tile{border:1px solid #696f61;border-top:4px solid var(--cat);text-align:left;background:#d4d8cd;flex-direction:column;align-items:flex-start;gap:0;min-width:0;padding:5px 8px;display:flex;position:relative;box-shadow:inset 1px 1px #f1f3eb,inset -1px -1px #929b86}.element-tile strong{color:#2c4421;align-self:center;font-size:24px;line-height:27px}.element-tile>span{align-self:center;font-size:12px}.element-tile small{font-size:10px;position:absolute;top:1px;left:5px}.element-tile strong{margin-top:7px}.element-tile:hover{background:#e5eadc;transform:translateY(-2px)}.element-tile.dim{color:#4c5346;box-shadow:none;background:#b5bbaa;border-top-color:#969f8d}.element-tile.dim strong{color:#55624b}.element-tile.selected{outline-offset:-3px;outline:3px solid #4e7e2e}.group-label,.period-label{color:#3d4c30;place-items:center;font-size:12px;display:grid}.period-label{z-index:1;background:#a7aca1;position:sticky;left:0}.series{box-shadow:none;border:1px dashed #697e56;padding:2px;font-size:11px;line-height:1.6}.series-label{text-align:center;align-self:center;font-size:12px}.table-note{color:#4c5d3f;pointer-events:none;flex-direction:column;grid-area:2/5/5/13;justify-content:center;gap:8px;padding:12px 24px;display:flex}.table-note strong{letter-spacing:6px;font-size:26px}.table-note span{letter-spacing:7px;font-size:12px}.table-note small{margin-top:10px}.museum-footer{color:#535e48;justify-content:space-between;gap:16px;margin-top:18px;font-size:12px;display:flex}.search-results{background:#dce3d2;border:2px solid #708260;margin-bottom:18px;padding:14px}.search-results>p{margin-bottom:10px;font-size:13px}.search-results>div{flex-wrap:wrap;gap:8px;max-height:220px;display:flex;overflow:auto}.search-results button{background:#e7ecdf;gap:10px}.search-results button b{font-size:20px}.search-results small{color:#637154}.list-grid{grid-template-columns:repeat(6,1fr);gap:12px;display:grid}.list-grid .element-tile{min-height:140px;padding:14px}.list-grid .element-tile strong{font-size:32px;line-height:40px}.list-grid .element-tile em{align-self:center;margin-top:10px;font-size:11px;font-style:normal}.element-dialog{box-shadow:var(--bevel),8px 8px #38482b55;background:var(--surface);color:inherit;border:3px solid #61685a;width:min(1260px,100% - 64px);max-width:none;height:min(860px,100dvh - 64px);max-height:none;padding:0;overflow:hidden}.element-dialog[open]{flex-direction:column;display:flex}.element-dialog::backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#26312070}.detail-heading{border-bottom:1px solid #8f9586;flex:none;justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.detail-heading>div{align-items:center;gap:16px;display:flex}.identity{color:#3f722c;background:#e0e5d7;flex-direction:column;justify-content:center;width:66px;height:66px;padding:6px;display:flex}.identity b{text-align:center;font-size:30px}.detail-heading h2{align-items:center;gap:12px;font-size:24px;display:flex}.detail-heading p{color:#546249;margin-top:6px;font-size:12px}.tag{background:#dce5d1;border:1px solid #95a288;padding:4px 7px;font-size:11px;font-weight:400;display:inline-block}.square{width:44px;padding:8px}.detail-body{scrollbar-color:#879976 #c6cdbe;flex:1;grid-template-columns:1fr 1fr;align-items:start;min-height:0;display:grid;overflow:auto}.stage-column{min-width:0;padding:24px;position:sticky;top:0}.stage{background:#bcc0b8;border:2px solid #70796a;height:390px;position:relative;overflow:hidden;box-shadow:inset 2px 2px #e6eddf}.stage-image{object-fit:contain;width:100%;height:100%}.canvas-host{position:absolute;inset:0}.canvas-host canvas{width:100%;height:100%;display:block}.canvas-host[hidden]{visibility:hidden;display:block}.media-kind{pointer-events:none;background:#e0e4dae8;padding:5px 8px;font-size:11px;position:absolute;top:10px;left:10px}.media-caption{text-align:center;pointer-events:none;background:#cbd1c5ee;width:100%;padding:7px;font-size:12px;position:absolute;bottom:0}.stage-controls{gap:6px;margin-top:12px;display:flex}.stage-controls .primary{flex:1}.view-controls{justify-content:space-between;gap:6px;margin-top:8px;display:flex}.view-controls button{flex:1;min-height:40px;font-size:12px}.stage-help{color:#55604c;margin-top:10px;font-size:12px;line-height:1.6}.structure-tabs{width:100%;margin-bottom:12px}.structure-tabs button{flex:1}.material-pair{gap:10px;margin-top:14px;display:flex}.material-pair figure{background:#dbe1d3;border:1px solid #8a9580;width:50%}.material-pair img{object-fit:contain;width:100%;height:90px}.material-pair figcaption{text-align:center;padding:5px;font-size:11px}.reading{flex-direction:column;gap:24px;min-width:0;padding:24px 26px 30px 12px;display:flex}.reading h3{margin-bottom:10px;font-size:20px;line-height:1.5}.reading p{font-size:14px;line-height:1.85}.facts{border-top:1px solid #9ba48f;border-bottom:1px solid #9ba48f;margin:0;padding:14px 0;display:flex}.facts>div{flex:1}.facts dt{color:#5a6550;font-size:11px}.facts dd{margin:6px 0 0;font-size:16px;font-weight:700}.life-grid{grid-template-columns:1fr 1fr;gap:12px;display:grid}.life-grid figure{background:#d7ddce;border:2px solid #8c9780;min-width:0}.life-grid img{object-fit:cover;width:100%;height:130px;display:block}.life-grid figcaption{padding:12px}.life-grid h4{margin-bottom:6px;font-size:14px}.life-grid p{font-size:12px}.use-symbol{color:#526d3f;background:#bac7ae;justify-content:center;align-items:center;gap:10px;height:100px;display:flex}.use-symbol .icon{width:32px;height:32px}.use-symbol span{font-size:14px}.why{background:var(--parchment);border-left:4px solid #a08a5e;padding:14px 18px}.misconception{padding:0 4px}.misconception h3{font-size:15px}.reading-section{box-shadow:var(--bevel);background:#d9dfd0;border:2px solid #8c9680}.reading-section summary{align-items:center;gap:10px;min-height:52px;padding:12px 16px;font-size:14px;font-weight:700;display:flex}.reading-section summary:after{content:"＋";margin-left:auto}.reading-section[open] summary:after{content:"−"}.reading-section>p,.reading-section>a{margin:0 16px 16px;display:block}.reading-section .source-lead{align-items:center;gap:12px;margin:0 16px 12px;font-size:12px;display:flex}.source-lead img{object-fit:contain}.detail-footer{border-top:1px solid #8b9580;flex:none;justify-content:space-between;gap:12px;padding:16px 24px;display:flex}.invalid{text-align:center;margin:auto;padding:30px}.invalid p{margin-bottom:24px}.toast{color:#fff;z-index:20;background:#2b4e1e;max-width:90vw;padding:12px 20px;font-size:13px;position:fixed;bottom:26px;left:50%;transform:translate(-50%);box-shadow:4px 4px #0003}.toast[hidden]{display:none}.loading-note{white-space:nowrap;background:#d3d9cde8;flex-direction:column;align-items:center;padding:10px;font-size:12px;display:flex;position:absolute;bottom:45px;left:50%;transform:translate(-50%)}.loading-note img{object-fit:contain}.notice{background:var(--parchment);margin-top:10px;padding:10px;font-size:12px}.notice button{margin-left:8px;font-size:12px}.image-error{flex-direction:column;justify-content:center;align-items:center;gap:14px;height:100%;display:flex}.image-error strong{color:#536746;font-size:72px}.image-error p{font-size:12px}.copy-fallback{background:#dce2d3;padding:12px 24px;font-size:12px}.copy-fallback input{-webkit-user-select:all;user-select:all;width:100%;padding:10px}@media (width>=1500px){.periodic{grid-template-rows:22px repeat(7,78px) 12px repeat(2,78px)}.element-tile strong{margin-top:12px;font-size:27px}}@media (width<=1000px){.museum{padding:20px}.site-header{padding:0 20px}.hero h1{font-size:26px}.hero img{width:180px}.list-grid{grid-template-columns:repeat(4,1fr)}.element-dialog{width:calc(100% - 32px);height:calc(100dvh - 32px)}.detail-body{display:block}.stage-column{max-width:660px;margin:auto;padding-bottom:14px;position:static}.stage{height:340px}.reading{padding:16px 26px 28px}.swipe-hint{display:inline}.table-intro{flex-wrap:wrap}.museum-footer{flex-direction:column}.detail-heading{padding:14px 20px}}@media (width<=600px){.site-header{flex-wrap:wrap;height:auto;min-height:76px;padding:12px 16px}.brand{font-size:20px}.header-actions{justify-content:space-between;gap:6px;width:100%}.header-actions button{min-height:40px;font-size:12px}.settings summary{font-size:12px}.museum{padding:16px 12px}.hero{gap:4px;min-height:170px;margin-bottom:20px;padding:18px 16px;position:relative}.hero>div{z-index:1;max-width:calc(100% - 60px)}.hero h1{max-width:220px;font-size:25px;line-height:1.5}.hero p{max-width:230px;font-size:12px}.hero .eyebrow{font-size:10px}.hero img{opacity:.9;width:90px;height:80px;position:absolute;bottom:15px;right:7px}.discovery-controls{flex-direction:column;gap:10px}.discovery-controls>.segmented{align-self:flex-end}.search{flex:auto;width:100%;padding:0 8px}.search input{font-size:13px}.filters{flex-wrap:nowrap;margin-bottom:12px;padding:3px 3px 10px;overflow:auto}.filters button{white-space:nowrap;flex:none;min-height:44px}.table-intro{gap:8px}.table-intro h2{font-size:16px}.table-intro span{font-size:11px}.swipe-hint{color:#536348;width:100%;font-size:11px}.table-scroll{padding:8px}.list-grid{grid-template-columns:repeat(2,1fr);gap:10px}.element-dialog{border:0;width:100%;height:100dvh;max-height:100dvh;margin:0}.detail-heading{border-top:3px solid #6e7c5c;padding:12px 16px}.detail-heading h2{font-size:22px}.identity{width:52px;height:56px}.identity b{font-size:25px}.detail-heading>div{gap:12px}.tag{font-size:10px}.stage-column{padding:16px 16px 8px}.stage{height:280px}.stage-controls button{padding:8px 10px}.reading{padding:18px 18px 28px}.reading h3{font-size:20px}.reading p{font-size:14px}.detail-footer{padding:10px 12px calc(10px + env(safe-area-inset-bottom));flex-wrap:wrap;gap:6px}.detail-footer button{padding:8px;font-size:12px}.detail-footer .primary{flex:1}.detail-footer .copy-link{width:100%;min-height:32px;box-shadow:none;border:0;order:5;padding:4px;text-decoration:underline}.life-grid img{height:106px}.facts dt{font-size:10px}.facts dd{font-size:14px}.media-caption{font-size:11px}.table-note strong{font-size:24px}.source-lead img{width:74px}.search-results button{font-size:12px}.search-results small{font-size:10px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}html[data-reduced=true] *{scroll-behavior:auto!important;transition:none!important}.canvas-host{inset:26px 0 32px}.stage-image{padding:26px 0 32px}@media (width>=1100px){.site-header{height:64px}.museum{padding:16px 28px 24px}.hero{height:90px;min-height:0;margin-bottom:14px;padding:12px 24px}.hero h1{margin:2px 0 3px;font-size:26px}.hero p{font-size:12px}.hero .eyebrow{margin:0;font-size:10px}.hero img{width:180px;height:78px}.discovery-controls{margin-bottom:12px}.search input{min-height:44px}.filters{margin-bottom:12px}.filters button{min-height:40px}.table-intro{margin-bottom:8px}.periodic{grid-template-rows:20px repeat(7,clamp(48px,11.1111dvh - 50px,66px)) 8px repeat(2,clamp(48px,11.1111dvh - 50px,66px));gap:4px}.element-tile{padding:3px 6px}.element-tile strong{margin-top:3px;font-size:22px;line-height:23px}.element-tile>span{font-size:11px;line-height:14px}.museum-footer{margin-top:12px}}.learning-entries{flex-wrap:wrap;align-items:center;gap:10px;margin:12px 0;display:flex}.learning-entries strong{color:#435636;font-size:13px}.learning-entries button{background:#d9dfcd;font-size:12px}.learning-lesson{color:#28312a;background:#e2e6d9;border:2px solid #82906d;grid-column:1/-1;width:100%;min-width:0;margin-bottom:26px}.lesson-header{background:#d7c49c;border-bottom:1px solid #9b9275;padding:24px 28px}.lesson-header h3{margin:8px 0 12px;font-size:25px}.lesson-header p{margin:0;line-height:1.7}.lesson-steps{border-bottom:1px solid #a9b099;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;padding:16px 24px;display:grid}.lesson-steps button{font-size:14px}.lesson-steps [aria-current=step]{color:#fff;background:#416e2b;border-color:#315124}.lesson-panel{min-height:300px;padding:24px;line-height:1.85}.lesson-panel h4{margin:0 0 12px;font-size:18px}.lesson-intro,.lesson-observe{grid-template-columns:1.3fr 1fr;gap:28px;display:grid}.lesson-question{background:#d3dcc7;border-left:5px solid #577843;padding:24px}.lesson-question h4{font-size:22px;line-height:1.8}.lesson-terms details,.lesson-transfer details,.lesson-misconception details,.lesson-advanced{background:#edf0e5;border:1px solid #a6b098;margin:10px 0;padding:12px 16px}.learning-lesson summary{cursor:pointer;font-weight:600}.learning-lesson p{line-height:1.85}.learning-visual{background:#d5dccb;border:1px solid #97a58b;min-width:0;padding:18px}.learning-visual svg{background:#e8ebdf;width:100%;max-height:290px;margin:14px 0;display:block}.learning-visual svg text{text-anchor:middle;fill:#34452e;font-family:inherit;font-size:15px}.learning-visual small{color:#526047;line-height:1.7;display:block}.condition-controls{flex-wrap:wrap;gap:10px;display:flex}.condition-controls label{cursor:pointer;background:#edf0e5;border:1px solid #839376;align-items:center;gap:8px;padding:9px;display:flex}.condition-controls input{accent-color:#497c2c;width:18px;height:18px}.observation-result{background:#edf0e5;margin:10px 0;padding:14px}.observation-result p{margin:7px 0}.lesson-observe aside{padding:20px 5px}.lesson-observe li{margin-bottom:18px}.explanation-chain{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.explanation-chain section{background:#f0f1e7;border:1px solid #a6b098;padding:20px}.lesson-number{color:#fff;background:#507439;place-items:center;width:28px;height:28px;margin-bottom:12px;display:inline-grid}.lesson-misconception{background:#dfd3b7;border-left:5px solid #a37e42;margin:20px 0;padding:18px}.lesson-transfer{max-width:800px;margin:auto}.lesson-transfer>h4{font-size:22px}.lesson-footer{border-top:1px solid #a6b098;justify-content:space-between;align-items:center;gap:8px;padding:16px 24px;display:flex}.lesson-footer span{color:#54624c;font-size:12px}.lesson-sources{border-top:1px solid #b0b79f;padding:12px 24px;font-size:12px}@media (width<=800px){.lesson-intro,.lesson-observe,.explanation-chain{grid-template-columns:1fr}.lesson-header{padding:20px}.lesson-header h3{font-size:23px}.lesson-steps{gap:4px;padding:12px}.lesson-steps button{min-width:0;padding:10px 2px;font-size:12px}.lesson-panel{min-height:0;padding:16px}.lesson-question{padding:16px}.lesson-question h4,.lesson-transfer>h4{font-size:19px}.lesson-observe{gap:10px}.lesson-footer{padding:12px}.learning-entries{grid-template-columns:1fr;gap:8px;display:grid}.learning-entries button{text-align:left;min-height:42px}.learning-lesson{margin-bottom:22px}.learning-visual{padding:12px}.lesson-observe aside{padding:10px}}@media (width>=801px){.lesson-header{padding:16px 24px}.lesson-header h3{margin:5px 0 8px;font-size:23px}.lesson-steps{padding:12px 20px}.lesson-panel{padding:18px}.learning-visual svg{max-height:220px}.observation-result p{font-size:13px}}.evidence-cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-bottom:20px;display:grid}.evidence-cards>section{background:#edf0e5;border:1px solid #9da992;padding:20px}.evidence-cards details{background:#e1e8d7;border-left:3px solid #65864a;padding:12px}.citations{white-space:normal;font-size:12px;font-weight:400}.citation-link{vertical-align:baseline;line-height:1.6;text-decoration:underline;min-height:0!important;box-shadow:none!important;color:#315b27!important;background:0 0!important;border:0!important;padding:0 2px!important;font-size:12px!important;display:inline!important}.reference-notes h4{margin-top:22px;font-size:16px}.reference-notes p{font-size:13px;line-height:1.8}.claim-notes{padding-left:24px}.claim-notes li{overflow-wrap:anywhere;background:#f0f2e7;border:1px solid #acb59f;margin:12px 0;padding:14px}.claim-notes li:focus{outline-offset:2px;outline:3px solid #5a843d}.claim-notes blockquote{background:#e3e7da;border-left:3px solid #8b9b77;margin:10px 0;padding:10px 14px;font-size:13px}.source-record{border-top:1px solid #abb499;padding:16px}.source-url,.source-record code{overflow-wrap:anywhere;font-size:12px}.source-record code{white-space:normal}.source-record details{font-size:12px}.visual-authority{color:#3d5335;font-size:12px}.learning-lesson .learning-visual{max-width:650px;margin:0 auto}.learning-lesson .lesson-observe{display:block}@media (width<=800px){.evidence-cards{grid-template-columns:1fr}.evidence-cards>section{padding:15px}.claim-notes{padding-left:18px}.source-record{padding:12px 0}.lesson-sources.reference-notes{padding:14px}.source-record strong{overflow-wrap:anywhere}}