@font-face{font-family:'DM Sans';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/dm-sans-400.ttf') format('truetype')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:500;font-display:swap;src:url('fonts/dm-sans-500.ttf') format('truetype')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:600;font-display:swap;src:url('fonts/dm-sans-600.ttf') format('truetype')}
@font-face{font-family:'DM Sans';font-style:normal;font-weight:700;font-display:swap;src:url('fonts/dm-sans-700.ttf') format('truetype')}
@font-face{font-family:'Libre Caslon Display';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/libre-caslon-display.ttf') format('truetype')}
:root{--ink:#203c43;--muted:#687879;--line:#dde4df;--paper:#fff;--bg:#faf9f6;--mint:#d9eee4;--teal:#287d70;--orange:#b76334;--blue:#667ba9;--gold:#b1974e;--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:112px}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans',Arial,sans-serif;font-size:16px;line-height:1.6}button,a,summary{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible,[role=button]:focus-visible{outline:3px solid #cf793d;outline-offset:5px}a{color:inherit;text-decoration:none}button{border:0;background:none}svg{display:block;max-width:100%;overflow:visible}svg text{font-family:'DM Sans',Arial,sans-serif}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:400}h1,h2{font-family:'Libre Caslon Display',Georgia,serif;letter-spacing:-.03em}.masthead{display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1280px;margin:0 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@media(max-width:1280px){.stack{margin:26px 25px 0}.page-footer{margin:0 30px}}
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@media(max-width:640px){.hero .intro,.step-summary,.step-detail,.physics p{font-size:16px}.step-visual{margin:5px 0 0}.part-chip,.step summary,.play,.legend button,.return-button,.crumb{font-size:14px}.part-chip .chip-type{font-size:9px}.step-detail{line-height:2.2}.step-note{font-size:13px}.step-visual{height:150px}.part-note{font-size:14px}.legend{gap:6px}.legend button{padding:5px 7px}.hero h1{font-size:63px}.ancestor-sub{font-size:10px}.ancestor-open{font-size:11px}.physics{margin-bottom:26px}.sample .hero h1{font-size:47px}.card-topline{gap:10px}.card-topline .meta{max-width:140px;text-align:right}.bottom-note{font-size:13px}}
.part-chip,.play,.legend button{min-height:44px}.step summary{min-height:36px}.crumb{min-height:34px}.return-button{min-height:44px}
.active-card{position:relative;animation:none;overflow-anchor:none}.card-content{position:relative}.fold-header{position:absolute;top:0;left:0;width:100%;height:78px;z-index:3;background:#f1f4ec;opacity:0;pointer-events:none}.is-folding .fold-header{animation:fold-header-in .45s .25s both}.is-folding .card-content{animation:fold-content-out .55s .15s both}.is-opening .fold-header{animation:fold-header-out .3s both}.is-opening .card-content{animation:fold-content-in .6s .1s both}.is-folding,.is-opening{border-radius:14px}.is-folding .fold-header .ancestor-open{opacity:0}.type.tool:before{background:#a4914e}.ancestor-mini.tool{color:#9a8749;background:#fbf7e8}.part-chip{border-radius:6px;min-height:35px;gap:6px;background:#f6f8f1;border-color:#d4dec8;padding:7px 9px;font-size:14px;line-height:1.25;margin:3px 2px}.part-chip.tool{background:#fbf8ed;border-color:#e1d8b9;color:#7e713e}.part-chip .mini-role{font-size:9px;color:#879575;font-weight:400;align-self:center;margin-left:3px}.part-chip.tool .mini-role{color:#a29361}.role-dot{height:5px;width:5px;flex-shrink:0;border-radius:50%;background:#769674}.part-chip.tool .role-dot{border-radius:1px;background:#ac9651}.part-chip.try{border-width:1.5px;padding-top:20px;outline-width:1px;outline-offset:2px}.part-chip.try:before{font-size:8px;top:5px}.part-chip .arrow{font-size:13px;color:#8da380}.part-chip.tool .arrow{color:#aa9a5e}.step-detail{line-height:2;font-size:16px}.step-summary{font-size:16px}.type{font-size:10px}.step-visual{overflow:hidden}.tool-rack{display:flex;gap:5px;align-items:start;flex-wrap:wrap;margin-top:8px;width:fit-content;background:#faf9f0;border-bottom:1px solid #e9e4cc;border-radius:7px;padding:4px 4px 0}.rack-tool{width:44px;min-height:42px;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:5px;position:relative;padding:3px}.rack-tool:hover{background:#ece8d3}.rack-tool svg{width:30px;height:27px}.rack-tool span{font-size:8px;line-height:1.15;color:#a49565;position:absolute;top:42px;white-space:nowrap;background:#fffdf3;border:1px solid #dfd8bb;padding:4px 5px;border-radius:4px;opacity:0;pointer-events:none;z-index:2}.rack-tool:hover span,.rack-tool:focus-visible span{opacity:1}.use-explanation{margin-top:17px;line-height:1.65;font-size:13px;color:#7a825f;border-left:2px solid #c6b875;padding:0 0 0 14px}.use-explanation p{margin-top:7px;max-width:660px}.use-action{font-size:13px;border:1px solid #d2c69b;border-radius:7px;padding:8px 12px;color:#7d7043;background:#fcf9ee;min-height:40px}.use-action:hover{background:#f4eed9}.tool-action{position:absolute;right:3px;top:10px;width:41px;opacity:.65;transform:translate(0,0)}.tool-action svg{height:30px}.action-line{position:absolute;top:34px;left:15px;width:1px;height:14px;border-left:1px dashed #c2ac67;opacity:0}.using-tool .tool-action{animation:tool-approach 2.8s ease-in-out infinite;opacity:1}.using-tool .action-line{animation:tool-contact 2.8s ease-in-out infinite}.using-tool .step-visual>svg{animation:work-pulse 2.8s ease-in-out infinite}.sample-label{background:#f8f5e6;border-color:#e0d6ac;color:#8e7a40}.sample .hero h1{font-size:54px}.ancestor-sub{text-transform:none;letter-spacing:.02em;font-size:11px}.crumb-relation{font-size:9px}.trail-wrap{padding-top:8px;padding-bottom:8px}.card-content .return-button{margin-top:4px}.step details{margin-top:7px}.page-footer{padding-top:16px}.part-note{line-height:1.6}.making{padding-bottom:30px}
@keyframes fold-header-in{from{opacity:0}to{opacity:1}}@keyframes fold-content-out{from{opacity:1}to{opacity:0}}@keyframes fold-header-out{from{opacity:1}to{opacity:0}}@keyframes fold-content-in{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@keyframes tool-approach{0%,100%{transform:translate(0,0)}35%,65%{transform:translate(-43px,21px)}}@keyframes tool-contact{0%,25%,85%,100%{opacity:0}40%,65%{opacity:1}}@keyframes work-pulse{0%,25%,85%,100%{filter:none}40%,65%{filter:drop-shadow(0 0 5px #dccb7b)}}
@media(max-width:640px){.active-card,.ancestor{margin-left:0!important}.sample .hero h1{font-size:43px}.fold-header{height:78px}.fold-header .ancestor-description{display:none}.step-detail{font-size:16px;line-height:2.05}.part-chip{font-size:14px;min-height:40px;gap:5px;padding:7px 8px}.part-chip .mini-role{font-size:9px}.part-chip.try{min-height:49px}.tool-rack{padding:5px 5px 3px;gap:4px;max-width:100%}.rack-tool{width:48px;min-height:53px;gap:2px;justify-content:start}.rack-tool span{position:static;opacity:1;white-space:normal;background:none;border:0;padding:0;font-size:8px;text-align:center;max-width:48px}.rack-tool svg{width:27px;height:25px}.use-explanation{font-size:13px;line-height:1.7;padding-left:11px}.use-action{font-size:13px;min-height:44px}.step-visual{height:151px}.tool-action{right:9px;top:17px;width:41px}.sample .section-meta{max-width:80px;text-align:right}.card-topline .meta{max-width:165px}.ancestor-sub{font-size:10px}.section-heading .section-meta{max-width:108px;text-align:right}.trail-arrow{font-size:10px}.crumb-relation{font-size:8px}.crumb{font-size:14px}.sample .hero{padding-top:24px}.sample .hero .deck{font-size:21px}.bottom-note{font-size:13px}.physics p{font-size:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}