[hidden]{display:none!important}:root{font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#171717;background:#fff;--line:#ddd;--muted:#666}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit;color:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,a,summary{cursor:pointer}a{color:inherit;text-decoration:none}button{background:#fff;border:1px solid #ccc;border-radius:4px;padding:8px 13px;white-space:nowrap}button:hover{background:#f2f2f2;border-color:#999}button:disabled{opacity:.4;cursor:default}button.active,.button-group button.active{background:#171717;border-color:#171717;color:#fff}input,select{border:1px solid #ccc;border-radius:4px;padding:8px 10px;background:#fff;max-width:100%}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid #111;outline-offset:3px}input[type=checkbox]{accent-color:#171717;width:15px;height:15px;flex:none}.site-header{height:68px;display:flex;align-items:center;gap:48px;padding:0 30px;border-bottom:1px solid var(--line)}.brand{font-size:22px;font-weight:650;letter-spacing:-.6px}.site-header nav{display:flex;align-self:stretch;gap:30px}.site-header nav a{display:flex;align-items:center;border-bottom:2px solid transparent;color:#666;font-size:15px}.site-header nav a.active{color:#111;border-color:#111}.site-header>.text-button{margin-left:auto;font-size:14px;color:#666}.text-button{border:0;background:transparent;padding:6px}.text-button:hover{background:#eee}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 20px}h1{font-size:24px;font-weight:600;letter-spacing:-.6px;margin:0}h2{font-size:16px;font-weight:600;margin:0}p{margin:0 0 12px}main{padding:24px 30px;max-width:1800px;margin:auto}.toolbar,.button-group{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.button-group{gap:0}.button-group button{border-radius:0;margin-left:-1px}.button-group button:first-child{border-radius:4px 0 0 4px;margin-left:0}.button-group button:last-child{border-radius:0 4px 4px 0}.toolbar button,.toolbar select{font-size:14px}.model-workspace{display:grid;grid-template-columns:250px minmax(0,1fr);height:calc(100dvh - 204px);min-height:440px;border:1px solid var(--line);border-radius:5px;overflow:hidden}.layer-panel{padding:16px;border-right:1px solid var(--line);overflow:auto}.section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.section-head button{font-size:14px}.layer-panel>input{width:100%;font-size:14px;margin-bottom:14px}.layer-tree{font-size:14px}.layer-tree details{padding-left:12px}.layer-tree>details{padding-left:0}.layer-tree summary{padding:5px 0;overflow-wrap:anywhere}.layer-tree summary label{display:inline-flex;align-items:center;gap:6px;max-width:calc(100% - 18px);vertical-align:middle}.layer-leaf{padding:4px 0 4px 12px;overflow-wrap:anywhere}.layer-leaf label{display:flex;align-items:flex-start;gap:6px}.model-surface{position:relative;min-width:0;height:100%}.model-canvas{width:100%;height:100%;background:#f5f5f5}.model-canvas canvas{display:block;width:100%;height:100%;touch-action:none}.model-footer{display:flex;align-items:center;gap:15px;margin-top:10px;font-size:13px;color:var(--muted)}.model-footer p{margin:0}.model-footer>span{margin-left:auto}.object-info{position:absolute;bottom:18px;left:18px;right:18px;background:#fffffff2;border:1px solid #ccc;padding:14px 18px;font-size:14px;border-radius:4px}.object-info>button{float:right;margin:-5px -7px 0 12px;font-size:22px;line-height:1}.object-info p{margin:5px 0 0;color:#666}.empty{display:flex;min-height:220px;align-items:center;justify-content:center;color:#777;padding:30px;gap:12px}.model-canvas>.empty{height:100%}.muted{color:var(--muted);font-size:14px}.quantity-note{margin-bottom:18px}.sheet-tools{display:flex;gap:12px;margin-bottom:16px}.sheet-tools input{margin-left:auto;width:260px}.table-wrap{overflow:auto;max-height:calc(100dvh - 290px);border:1px solid var(--line)}table{border-collapse:collapse;width:100%;font-size:14px}td{padding:10px 13px;border-bottom:1px solid #e8e8e8;min-width:90px;max-width:420px;overflow-wrap:anywhere;vertical-align:top}tr:nth-child(even){background:#fafafa}tr:hover{background:#f2f2f2}.pagination{display:flex;align-items:center;justify-content:flex-end;gap:10px;margin:15px 0;font-size:14px}.pagination span{margin-right:auto;color:#666}.clash-page{padding:0;max-width:none}.clash-frame{display:block;width:100%;height:calc(100dvh - 69px);border:0;background:white}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:800px){.site-header{padding:0 18px;gap:28px}.site-header nav{gap:20px}main{padding:20px 18px}.page-heading{align-items:flex-start;gap:14px;flex-wrap:wrap}.model-workspace{grid-template-columns:200px minmax(0,1fr)}.model-footer>span{display:none}}@media(max-width:580px){.site-header{height:60px;gap:20px;padding:0 14px}.brand{font-size:20px}.site-header nav{gap:14px}.site-header>.text-button{font-size:12px;padding:4px}.site-header nav a{font-size:14px}main{padding:18px 14px}.model-workspace{grid-template-columns:1fr;height:auto;min-height:0}.layer-panel{max-height:220px;border-right:0;border-bottom:1px solid var(--line)}.model-surface{height:56dvh;min-height:370px}.sheet-tools{flex-wrap:wrap}.sheet-tools input{margin-left:0;width:100%}.table-wrap{max-height:65dvh}.clash-frame{height:calc(100dvh - 61px)}}

.compare-entry{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.compare-link{display:inline-flex;align-items:center;gap:28px;padding:10px 15px;border:1px solid #bbb;border-radius:4px;font-size:14px}.compare-link:hover{background:#f4f4f4;border-color:#777}.comparison-page{max-width:none;padding:0}.comparison-bar{height:47px;padding:8px 24px;border-bottom:1px solid var(--line);font-size:14px}.comparison-frame{display:block;width:100%;height:calc(100dvh - 115px);min-height:400px;border:0}

.compare-entry{display:flex;flex-wrap:wrap;gap:12px}.ift-heading{margin-top:22px}.ift-comparison-table{max-height:none;margin:15px 0}.ift-comparison-table th{text-align:left;background:#f4f4f4;padding:10px 13px;border-bottom:1px solid #ccc;white-space:nowrap}.ift-comparison-table td.numeric{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}.ift-additional{margin:22px 0;font-size:14px}.ift-additional summary{cursor:pointer}.ift-notes{max-width:1100px;color:#666;font-size:14px;margin-top:24px}

.showcase-badge{margin-left:auto;color:#777;font-size:12px;letter-spacing:.06em;text-transform:uppercase}.subtle-tag{font-size:13px;color:#666}.sample-table{max-width:1000px;max-height:none}th{text-align:left;padding:13px;border-bottom:1px solid #ccc;font-size:12px;font-weight:600;color:#666}td.numeric{text-align:right;font-variant-numeric:tabular-nums}.sample-table th:nth-child(2){text-align:right}.sample-table td{padding:20px 13px}.restricted{display:flex;gap:18px;margin-top:32px;border:1px solid #ddd;background:#fafafa;border-radius:5px;padding:28px;max-width:1000px}.restricted p{font-size:14px;color:#777;max-width:600px;margin:8px 0 18px}.lock{filter:grayscale(1);font-size:23px}.access-label{display:inline-block;font-size:12px;color:#666;border:1px solid #ddd;border-radius:4px;padding:5px 9px}.case-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;max-width:1200px}.case-card{display:block;border:1px solid #ddd;border-radius:5px;padding:28px}.case-card:hover{border-color:#888;background:#fafafa}.case-number{font-size:30px;letter-spacing:-1px;color:#bbb;display:block;margin-bottom:20px}.case-discipline{font-size:12px;color:#666}.case-card h2{font-size:20px;margin:8px 0 12px}.case-card p{font-size:14px;color:#666;max-width:450px;min-height:65px}.case-action{display:flex;justify-content:space-between;font-size:14px;padding-top:20px;margin-top:15px;border-top:1px solid #eee}.back-link{display:inline-block;margin-bottom:16px}.case-finding{font-size:15px;max-width:1000px;margin-bottom:22px}.scene-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:12px;font-size:13px}.scene-toolbar button{font-size:13px}.scene-legend{margin-left:auto;display:flex;gap:16px;flex-wrap:wrap}.scene-legend label{display:flex;align-items:center;gap:5px}.scene-legend i{width:9px;height:9px;border-radius:50%}.legend-a{background:#e16b16}.legend-b{background:#1682c4}.scene-wrap{height:55dvh;min-height:350px;border:1px solid #ddd;background:#fafafa;overflow:hidden;border-radius:5px}.scene-wrap canvas{display:block;width:100%;height:100%;touch-action:none}.scene-caption{display:flex;justify-content:space-between;gap:20px;margin-top:9px;font-size:12px;color:#777}.drawing-example{margin-top:30px;max-width:1200px}.drawing-example p{margin:8px 0 12px}.drawing-button{display:block;width:100%;padding:0;overflow:hidden}.drawing-button img{width:100%;display:block}dialog{max-width:96vw;max-height:94dvh;padding:12px;border:1px solid #bbb;border-radius:5px}dialog::backdrop{background:#0009}dialog form{position:sticky;top:0;text-align:right}dialog img{display:block;max-width:90vw;max-height:80dvh;object-fit:contain}@media(max-width:680px){.case-grid{grid-template-columns:1fr}.showcase-badge{font-size:10px}.site-header{gap:15px}.scene-legend{margin-left:0;width:100%;gap:10px}.scene-caption{flex-direction:column;gap:5px}.restricted{padding:20px}.case-card{padding:22px}}

.showcase-intro{padding:16px 30px;border-bottom:1px solid #eee}.showcase-intro p{margin:0;font-size:16px;color:#555}

/* Shared public presentation and compact quantity proof. */
.showcase-intro{display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1800px;margin:auto}
.contact-link,.button-link{display:inline-flex;align-items:center;justify-content:center;border:1px solid #bbb;border-radius:4px;padding:8px 14px;font-size:14px;white-space:nowrap}
.contact-link{background:#171717;color:#fff;border-color:#171717}
.contact-link:hover{background:#333}.button-link:hover{background:#f5f5f5}
.model-workspace{height:calc(100dvh - 260px)}
.sample-table{max-width:none}.sample-table table{font-size:16px}
th.numeric,td.numeric{text-align:right;font-variant-numeric:tabular-nums}
thead th{font-size:14px}tbody th{font-size:16px;color:#171717;font-weight:500}
.sample-table tbody th{padding:20px 13px;border-bottom:1px solid #e8e8e8}
.subtle-tag,.case-discipline{font-size:14px}.quantity-note,.case-card p,.case-finding{font-size:16px}
.proof-teaser{display:flex;align-items:center;justify-content:space-between;gap:28px;margin-top:26px;padding:24px 0;border-top:1px solid #ddd;border-bottom:1px solid #ddd}
.proof-teaser:hover h2{text-decoration:underline;text-underline-offset:4px}
.proof-teaser h2{font-size:20px;margin:5px 0 8px;line-height:1.35}
.proof-teaser p{font-size:16px;color:#666;margin:0}.eyebrow{font-size:14px;color:#666}
.teaser-action{display:inline-flex;gap:20px;align-items:center;font-size:16px;white-space:nowrap}
.proof-summary{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-block:1px solid #ddd;margin-bottom:24px;padding-block:20px}
.proof-summary>div{padding-inline:24px;border-right:1px solid #ddd}.proof-summary>div:first-child{padding-left:0}.proof-summary>div:last-child{border:0}
.proof-summary strong{display:block;font-weight:550;font-size:28px;line-height:1.4;font-variant-numeric:tabular-nums;white-space:nowrap}
.proof-summary small{font-size:16px;font-weight:400}.proof-summary span{display:block;font-size:14px;color:#666}
.proof-workspace{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.proof-pane{min-width:0;border:1px solid #ddd;border-radius:4px;overflow:hidden}
.proof-pane-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:58px;padding:12px 16px;border-bottom:1px solid #ddd}
.proof-pane-heading>span{font-size:14px;color:#666}.proof-pane-heading button{font-size:14px;padding:6px 10px}
.proof-drawing{position:relative;aspect-ratio:660/480;background:white}
.proof-drawing img{display:block;width:100%;height:auto}
.proof-drawing svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.proof-canvas{width:100%;aspect-ratio:660/480;min-height:300px;background:#f5f5f5}
.proof-canvas canvas{display:block;width:100%;height:100%;touch-action:none}
.proof-caption{font-size:14px;color:#666;padding:10px 16px;margin:0;border-top:1px solid #eee}
.proof-quantities{margin-top:26px}.proof-quantities>.proof-pane-heading{padding:0 0 12px}
.proof-scope{margin:12px 0;font-size:16px;max-width:1000px}
.proof-quantities .table-wrap{max-height:none}.proof-quantities td{vertical-align:middle;font-size:16px}
.proof-quantities tbody th{padding:6px 10px;border-bottom:1px solid #e8e8e8}
.proof-quantities tr.selected{background:#eaf3f6}
.member-button{font-size:16px;border-color:transparent;background:transparent;padding:7px 4px;color:#075a78;text-decoration:underline;text-underline-offset:3px}
.member-button[aria-pressed=true]{font-weight:650}.member-button:disabled{color:#555;text-decoration:none}
.proof-quantities tfoot th,.proof-quantities tfoot td{font-size:16px;font-weight:600;border-top:2px solid #bbb;padding:16px 13px}
.scene-toolbar,.scene-toolbar button{font-size:14px}.scene-caption{font-size:14px}
@media(max-width:800px){.showcase-intro{padding:14px 18px}.proof-workspace{grid-template-columns:1fr}.proof-summary strong{font-size:24px}.proof-summary>div{padding-inline:14px}.proof-canvas{max-height:480px}.proof-summary{gap:0}}
@media(max-width:580px){.showcase-intro{padding:12px 14px;align-items:flex-start;flex-direction:column;gap:12px}.showcase-intro p{font-size:16px}.showcase-badge{display:none}.site-header{gap:28px}.site-header nav{gap:22px}.site-header nav a{font-size:16px}.model-workspace{height:auto}.model-surface{height:54dvh;min-height:340px}.layer-panel{max-height:160px}.proof-summary{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:20px}.proof-summary>div{padding-left:0;border:0}.proof-summary strong{font-size:25px}.proof-teaser{align-items:flex-start;flex-direction:column;gap:18px}.proof-teaser h2{font-size:20px}.proof-pane-heading{padding:12px;flex-wrap:wrap}.proof-canvas{min-height:270px}.proof-quantities td,.proof-quantities tbody th{font-size:14px;padding:8px}.proof-quantities thead th{padding:10px 8px;font-size:14px}.member-button{font-size:14px;padding:7px 0}.proof-quantities td{min-width:0}.proof-quantities table{min-width:340px}.toolbar{gap:10px}}

.proof-calculation{font-size:14px;color:#666;margin:0 0 14px}