:root{--ink:#17324d;--paper:#fff8e7;--white:#fffdf8;--orange:#b64029;--orange-fill:#f3b27b;--blue:#28768d;--blue-fill:#a3d4df;--teal:#087f7b;--red:#db342b;--line:#17324d26}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:linear-gradient(#17324d06 1px,transparent 1px),linear-gradient(90deg,#17324d06 1px,transparent 1px),var(--paper);background-size:28px 28px;font:16px/1.65 "PingFang SC","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button{cursor:pointer;color:var(--ink);background:var(--white);border:1.5px solid var(--ink);border-radius:8px;padding:9px 15px;font-weight:700;min-height:44px}button:hover:not(:disabled){background:#f8edca}button:disabled{opacity:.4;cursor:default}button[aria-pressed=true],button[aria-current=step]{background:var(--ink);color:var(--white)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #d99b12;outline-offset:4px}.primary{background:var(--teal);border-color:var(--teal);color:white}.primary:hover:not(:disabled){background:#086b68}.skip-link{position:absolute;top:-80px;left:20px;background:var(--white);padding:12px;z-index:5}.skip-link:focus{top:10px}.page-shell{max-width:1240px;width:calc(100% - 48px);margin:0 auto;padding-top:20px}.course-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;max-width:1100px}.course-nav a{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;background:var(--white);border:2px solid var(--ink);border-radius:8px;padding:8px 14px;box-shadow:3px 3px #17324d18;font-size:14px;font-weight:700}.course-nav a[aria-current=page]{background:var(--teal);border-color:var(--teal);color:white}.course-nav b{font-size:22px}.course-nav small{display:block;font-size:11px;font-weight:500}.hero{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:27px 8px 24px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:800;color:var(--teal);margin:0 0 6px}h1{font-size:clamp(28px,3.4vw,42px);margin:0;line-height:1.45;letter-spacing:-1px}h1 span{background:linear-gradient(transparent 65%,#f2ce63 65%)}.hero p:last-child{color:#4c6275;margin:8px 0 0}.hero-stamp{background:#f6da79;border:1px dashed #b68b26;padding:12px 26px;transform:rotate(3deg);text-align:center;font-size:13px;flex-shrink:0}.hero-stamp strong{font-size:17px}.lesson-toolbar{display:flex;gap:16px;align-items:center;justify-content:space-between;margin-bottom:16px}.steps{display:flex;flex:1;gap:7px}.steps button{flex:1;text-align:left;padding:10px 13px;border-color:var(--line);font-size:16px;position:relative;line-height:1.35}.steps span{display:inline-grid;place-items:center;width:24px;height:24px;background:#e8e3d4;border-radius:50%;color:var(--ink);margin-right:6px;font-size:12px}.steps small{display:block;font-size:11px;margin:3px 0 0 32px;font-weight:500}.utilities{display:flex;gap:8px}.utilities button{font-size:12px;padding:9px}.lab{background:var(--white);border:2px solid var(--ink);border-radius:14px;box-shadow:7px 7px #17324d13;overflow:hidden}.lab-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:22px 28px;border-bottom:1px solid var(--line)}h2{font-size:25px;line-height:1.45;margin:0}.lesson-tag{font-size:12px;background:#e9f2ea;border-radius:30px;padding:6px 13px;white-space:nowrap}.workbench{display:grid;grid-template-columns:minmax(0,1fr) 290px;min-height:380px}.scene{padding:24px 28px;min-width:0}.controls{background:#f5efdf;padding:24px;border-left:1px solid var(--line)}.controls h3{margin:0 0 14px;font-size:19px}.controls>button{width:100%;margin-top:12px}.small{font-size:13px;color:#526577}.controls p{margin:8px 0 16px}.ingredient{padding:16px 0;border-bottom:1px dashed var(--line)}.ingredient-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.ingredient h3{margin:0;font-size:17px}.orange-text{color:var(--orange)}.blue-text{color:var(--blue)}.stepper{display:inline-flex;align-items:center;gap:13px}.stepper button{padding:2px;width:44px;font-size:22px}.stepper output{font-weight:800;font-size:22px;min-width:1.4em;text-align:center}.cups{display:flex;flex-wrap:wrap;gap:6px;align-items:flex-end;min-height:68px}.cup{width:47px;height:65px;display:inline-block;flex-shrink:0;vertical-align:bottom}.cup svg{width:100%;height:100%;display:block}.cups.compact{gap:2px;min-height:39px}.compact .cup{width:27px;height:38px}.legend-note{font-size:12px;color:#526577;margin:0 0 12px}.equation{background:#faf0d4;border-radius:10px;padding:16px 20px;margin:20px 0 8px;text-align:center}.equation .caption{display:block;font-size:13px;margin-bottom:5px}.math{font-size:clamp(27px,3vw,39px);font-weight:800;line-height:1.4;letter-spacing:1px}.math.small-math{font-size:25px}.fraction{display:inline-flex;vertical-align:middle;flex-direction:column;text-align:center;line-height:1.1;min-width:.8em;font-size:.8em;margin:0 4px}.fraction>span:first-child{border-bottom:2px solid currentColor;padding:0 4px 3px}.fraction>span:last-child{padding-top:3px}.button-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.button-row button{flex:1;white-space:nowrap}.question{margin:22px 0 0;border-top:1px dashed var(--line);padding-top:17px}.question h3{font-size:17px;margin:0 0 9px}.whole-highlight{outline:3px solid #d39c17;outline-offset:8px;border-radius:4px}.guide{display:flex;align-items:center;gap:15px;padding:14px 28px;background:#f7f1df;border-top:1px solid var(--line);min-height:102px}.guide img{object-fit:contain;flex-shrink:0}.guide strong{font-size:12px;color:var(--teal);letter-spacing:1px}.guide p{margin:3px 0 0;font-size:15px}.page-controls{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:22px 0}.page-controls p{font-size:12px;color:#526577}.teacher-notes{border-top:1px solid var(--line);padding-top:12px}.teacher-notes summary{cursor:pointer;font-size:14px;font-weight:700;padding:10px 0}.concepts{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding-top:12px}.concepts article{border-left:3px solid #e4bd52;padding-left:14px}.concepts span{font-size:13px;color:var(--teal)}.concepts strong{display:block;font-size:25px;margin:7px 0}.concepts p,.teacher-footnote{font-size:13px;color:#526577}.teacher-footnote{margin-top:18px}footer{display:flex;justify-content:space-between;padding:24px 0;font-size:12px;color:#526577}.preset-label{font-size:13px;font-weight:700}.unit-model{display:grid;grid-template-columns:1fr auto 1fr;gap:15px;align-items:center;margin:15px 0}.unit-box{padding:18px;background:#f6f3ea;border-radius:10px;min-height:180px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px}.unit-box h3{font-size:14px;margin:0}.unit-box .cups{justify-content:center}.unit-arrow{font-size:14px;font-weight:700;color:var(--teal);text-align:center}.unit-arrow b{display:block;font-size:25px}.result-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.result-pair>div{border:1px solid var(--line);padding:15px;border-radius:9px;text-align:center}.result-pair p{font-size:13px;margin:0 0 7px}.total-strip{background:#edf4ed;color:#245d46;border-radius:7px;font-size:13px;padding:10px 14px;margin:0 0 17px}.pack-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.pack{border:1.5px dashed #b88c35;border-radius:10px;padding:11px;background:#fff9e9}.pack-title{display:flex;justify-content:space-between;font-size:12px;font-weight:700;margin-bottom:8px}.pack .blue-text{margin-top:6px}.pack-type{font-size:11px;margin-bottom:3px}.divide-history{font-size:15px;line-height:1.8;margin:16px 0}.success{display:flex;gap:12px;align-items:center;justify-content:center;color:var(--red);font-weight:800;margin:12px 0}.success svg{width:64px;height:64px;stroke:currentColor;stroke-width:7;fill:none;stroke-linecap:round;stroke-linejoin:round;animation:check-pop .55s ease both}.success p{margin:0;font-size:20px}.success small{display:block;font-size:12px;font-weight:500;color:var(--ink)}.compare-lab{border-top:1px solid var(--line);padding:22px 28px}.compare-heading{display:flex;justify-content:space-between;align-items:center;gap:15px}.compare-heading h3{margin:0;font-size:18px}.compare-heading .button-row{margin:0}.compare-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:16px}.mix-box{background:#f6f3ea;border-radius:8px;padding:14px}.mix-box h4{font-size:14px;margin:0 0 12px}.mix-track{display:flex;height:26px;overflow:hidden;border:1px solid var(--ink);border-radius:5px}.mix-track .juice{background:var(--orange-fill);border-right:1px solid var(--ink)}.mix-track .water{background:var(--blue-fill)}.mix-legend{display:flex;flex-wrap:wrap;justify-content:space-between;font-size:12px;gap:8px;margin-top:8px}.compare-feedback{font-weight:700;font-size:14px;margin:13px 0 0}.challenge-tabs{display:flex;gap:7px;padding:16px 28px 0;flex-wrap:wrap}.challenge-tabs button{font-size:13px}.challenge-header{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:18px}.challenge-header h3{font-size:19px;margin:0}.score{font-size:13px;color:var(--teal);font-weight:700}.answer-form label{display:block;font-size:14px;font-weight:700;margin-bottom:12px}.answer-form input{width:70px;text-align:center;border:1.5px solid #8c9da7;background:var(--white);border-radius:7px;padding:9px;font-size:21px;color:var(--ink)}.form-pair{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.form-pair .field{padding:18px;background:#f6f3ea;border-radius:8px;flex:1;min-width:190px}.fraction-fields{display:inline-flex;flex-direction:column;align-items:center;gap:5px;vertical-align:middle}.fraction-fields input{padding:3px;min-height:42px}.fraction-fields input:first-child{border-bottom:3px solid var(--ink)}.wrong-example{font-size:26px;background:#faeddb;padding:22px;border-radius:10px;text-align:center;margin:16px 0}.explanation{font-size:14px;color:#526577}.chips{display:flex;flex-wrap:wrap;gap:10px}.chips button{font-size:23px;min-width:95px}.reveal-placeholder{padding:40px 16px;border:2px dashed var(--line);border-radius:10px;color:#526577;text-align:center}.entrance{animation:appear .45s ease both}.pack.entrance{animation-delay:calc(var(--i,0)*70ms)}.animate-cup .cup{animation:appear .45s ease both}.motion-paused *{animation-play-state:paused!important}.motion-paused .entrance{animation:none}.shake{animation:shake .3s ease}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}@keyframes appear{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:translateY(0)}}@keyframes check-pop{0%{transform:scale(.4);opacity:0}70%{transform:scale(1.15)}100%{transform:scale(1);opacity:1}}@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
@media(max-width:1000px){.lesson-toolbar{align-items:stretch;flex-wrap:wrap}.steps{flex-basis:100%}.utilities{margin-left:auto}.workbench{grid-template-columns:minmax(0,1fr) 245px}.scene{padding:20px}.controls{padding:20px}.course-nav a{padding:8px;gap:7px;font-size:12px}}
@media(max-width:700px){.page-shell{width:calc(100% - 24px);padding-top:12px}.course-nav{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{padding:22px 0}.hero-stamp{display:none}.hero p:last-child{font-size:14px}.steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.steps button{font-size:14px}.utilities button{min-height:40px}.workbench{grid-template-columns:1fr}.controls{border-left:0;border-top:1px solid var(--line)}.lab-heading{padding:20px;align-items:flex-start}.lesson-tag{display:none}h2{font-size:21px}.scene{padding:20px 16px}.guide{padding:12px 16px}.guide p{font-size:14px}.page-controls button{font-size:13px;padding:9px 12px}.page-controls p{display:none}.compare-heading{display:block}.compare-heading .button-row{margin-top:12px}.compare-lab{padding:20px 16px}.compare-pair{gap:10px}.mix-box{padding:10px}.unit-model{gap:7px}.unit-box{padding:12px 8px;min-height:170px}.unit-arrow{font-size:11px}.unit-box .cup{width:31px;height:44px}.result-pair{gap:8px}.result-pair>div{padding:12px 6px}.concepts{grid-template-columns:1fr}.challenge-tabs{padding:16px 16px 0}.challenge-tabs button{flex:1;white-space:nowrap}.form-pair{align-items:stretch}.cup{width:39px;height:54px}.math{font-size:29px}.pack-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.pack{padding:9px}.pack .cup{width:23px;height:34px}}
.motion-paused *{animation:none!important}
button[aria-pressed=true]:hover:not(:disabled),button[aria-current=step]:hover:not(:disabled){background:var(--ink);color:var(--white)}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Textbook sequence: observe, compare, group, simplify, apply. */
.lesson-toolbar{flex-wrap:wrap;gap:10px}.steps{flex-basis:100%}.utilities{margin-left:auto}.hero{padding:20px 8px}.hero-stamp{padding:8px 24px}.scene-question{font-size:19px;font-weight:700;margin:0 0 18px}.source-label{font-size:12px;color:var(--teal);font-weight:700;margin:0 0 15px;letter-spacing:.5px}.topic-tabs{display:flex;gap:8px;flex-wrap:wrap;padding:18px 28px 0}.topic-tabs button{font-size:14px}.photo-gallery{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.photo-card{border:2px solid var(--line);border-radius:10px;padding:10px;background:#f9f5e9;text-align:center;min-width:0;position:relative}.photo-card.reference{border-style:dashed;border-color:#c9a351}.photo-card[aria-pressed=true]{background:#e6f2ed;border-color:var(--teal);color:var(--ink)}.photo-card[aria-pressed=true]:hover{background:#d5e9df;color:var(--ink)}.photo-card[aria-pressed=true]::after{content:'✓';position:absolute;right:10px;top:7px;color:var(--teal);font-size:20px}.photo-label{font-size:17px;font-weight:800}.photo-space{display:flex;justify-content:center;align-items:center;height:150px}.photo-size{font-size:12px;font-weight:500}.picture-frame{border:2px solid var(--ink);overflow:hidden;flex-shrink:0;background:#d6eef1;box-shadow:3px 3px #17324d16}.picture-frame svg{display:block;width:100%;height:100%}.shape-workshop{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:22px 28px;background:#f5efdf;border-block:1px solid var(--line)}.shape-workshop h3{margin:0;font-size:18px}.stretch-picture{min-height:155px;display:flex;align-items:center;justify-content:center}.stretch-controls label{display:flex;gap:7px;align-items:center;font-weight:700;font-size:14px}.stretch-controls output{font-size:19px;color:var(--teal)}input[type=range]{width:100%;accent-color:var(--teal);height:32px;cursor:pointer}.stretch-controls .button-row{margin:8px 0}.stretch-controls button{font-size:13px;padding:8px}.picture-equation{margin:20px 28px}.picture-equation .math{font-size:clamp(22px,3vw,34px)}.term-labels{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 24px;font-size:13px;margin-top:12px}.term-labels b{color:var(--teal)}.connection-note{padding:0 28px 16px;font-size:13px;text-align:center;color:#526577}.inline-message{padding:12px 18px;background:#fff0cc;border-left:4px solid #cf9a12;border-radius:4px;font-weight:600}.table-scroll{overflow-x:auto}.data-table{border-collapse:collapse;width:100%;font-size:14px;white-space:nowrap}.data-table th,.data-table td{padding:14px 10px;border-bottom:1px solid var(--line);text-align:left}.data-table thead{background:#f5efdf}.data-table tbody th{color:var(--teal)}.rate-results{border-top:1px dashed var(--line);padding-top:12px}.rate-row{margin:15px 0}.rate-row>div:first-child{display:flex;flex-wrap:wrap;gap:6px 14px;justify-content:space-between;font-size:14px;margin-bottom:6px}.rate-row b{font-size:20px;color:var(--teal)}.rate-track{height:18px;border-radius:4px;background:#e9e5d9;overflow:hidden}.rate-track>span{display:block;height:100%;background:#378f93;transition:width .4s}.target-card{display:flex;flex-direction:column;gap:5px;border:1.5px dashed #b89c4e;border-radius:8px;background:#fff5d3;padding:16px}.target-card>span:first-child{font-size:12px;font-weight:800;color:var(--teal)}.target-card strong{font-size:22px}.pigment-raw h3{font-size:15px;margin:18px 0 8px}.pigment-blocks{display:flex;flex-wrap:wrap;gap:4px;margin:5px 0}.pigment{width:22px;height:22px;border-radius:4px;border:1px solid #17324d38;display:inline-block}.pigment.blue{background:#4189bb}.pigment.yellow{background:#f3ce4d}.pigment-groups{display:grid;grid-template-columns:repeat(auto-fit,minmax(125px,1fr));gap:10px}.pigment-pack{border:1.5px dashed #b49c5e;border-radius:8px;background:#fff8e5;padding:10px;animation-delay:calc(var(--i,0)*70ms)}.pigment-pack small{font-size:11px;color:#526577}.pigment-track{height:28px;background:#f3ce4d;border:1px solid var(--ink);border-radius:5px;overflow:hidden}.pigment-track>span{display:block;height:100%;background:#4189bb;transition:width .4s}.method-steps{display:grid;gap:12px;margin:20px 0}.method-step{display:flex;gap:12px;padding:16px;background:#f1f5ed;border-radius:9px;align-items:flex-start}.method-step>span{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;color:white;background:var(--teal);flex-shrink:0;font-size:12px}.method-step p{margin:0 0 12px;font-size:14px}.method-step strong{font-size:21px;line-height:1.8}.custom-ratio{margin-top:24px;padding-top:18px;border-top:1px dashed var(--line)}.custom-fields{display:flex;align-items:center;gap:8px}.custom-fields input{width:0;flex:1;min-width:0;border:1.5px solid #8c9da7;border-radius:6px;padding:9px 5px;text-align:center;background:var(--white);color:var(--ink);font-size:20px}.custom-ratio button{width:100%}.input-error{font-size:13px;color:#b12c22}.exercise-prompt{font-size:20px;max-width:850px;line-height:1.9;margin:0 0 24px}.practice-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.practice-options button{text-align:left;padding:17px}.ratio-inputs{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.answer-form #value-answer{width:140px}.answer-form .field>label{margin-bottom:16px}.answer-form>.button-row{margin-top:24px;max-width:660px}.answer-form .field{min-height:150px}.challenge-tabs button{min-width:44px;padding:8px 13px}.extension-body{padding:14px 24px 22px;background:var(--white);border:1px solid var(--line);border-radius:10px;margin:8px 0 20px}.extension-body .topic-tabs{padding:0;margin-bottom:20px}.proportion-pair{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:center}.relation-sign{font-size:34px;font-weight:800;color:var(--teal)}.proportion-pair .equation{margin-top:0}.proportion-pair .math{font-size:30px}.proportion-pair .equation p{font-size:22px}.motion-paused *{transition:none!important}
@media(max-width:900px){.steps button{padding:10px 7px;font-size:14px}.steps small{margin-left:0}.photo-gallery{gap:7px}.shape-workshop{gap:20px}.photo-card{padding:8px}.stretch-controls .button-row button{white-space:normal}.method-step strong{font-size:18px}}
@media(max-width:700px){.steps button:last-child{grid-column:1 / -1}.steps small{margin-left:32px}.photo-gallery{grid-template-columns:repeat(3,minmax(0,1fr))}.photo-card.reference{grid-row:span 2;display:flex;flex-direction:column;justify-content:center}.photo-space{height:140px}.photo-card .picture-frame{max-width:100%}.shape-workshop{grid-template-columns:1fr;padding:20px 16px;gap:8px}.stretch-picture{min-height:155px}.picture-equation{margin:16px}.picture-equation .math{line-height:1.9}.topic-tabs{padding:16px 16px 0}.data-table th,.data-table td{padding:12px 8px}.method-step{padding:12px;gap:8px}.exercise-prompt{font-size:18px}.practice-options{grid-template-columns:1fr}.form-pair .field{min-width:100%}.ratio-inputs input{width:64px}.extension-body{padding:16px}.proportion-pair{gap:6px}.proportion-pair .math{font-size:22px}.relation-sign{font-size:24px}.proportion-pair .equation{padding:13px 6px}.proportion-pair .equation p{font-size:18px}.source-label{font-size:11px}.term-labels{gap:8px 15px}}
/* All photograph geometry uses the same square grid, including on narrow screens. */
.board-instruction{font-size:14px;color:var(--teal);margin:0 0 16px}
.board-scroll{overflow:auto;overscroll-behavior-x:contain;border:1px solid #aab7b4;border-radius:8px;background:#fffdf7}
.photo-board{position:relative;width:100%;max-width:952px;min-width:612px;aspect-ratio:34/16;margin:auto;background-color:#fffdf7;background-image:linear-gradient(to right,#536d8130 1px,transparent 1px),linear-gradient(to bottom,#536d8130 1px,transparent 1px);background-size:calc(100% / 34) calc(100% / 16);isolation:isolate}
.board-photo{position:absolute;padding:0;min-height:0;border:0;border-radius:0;outline:2px solid var(--ink);background:transparent;cursor:grab;touch-action:none;user-select:none;box-shadow:3px 3px #17324d20;z-index:1;line-height:1}
.board-photo:hover:not(:disabled){background:transparent;outline-color:var(--teal)}
.board-photo[aria-pressed=true],.board-photo[aria-pressed=true]:hover:not(:disabled){outline:4px solid var(--teal);background:transparent;color:var(--ink)}
.board-photo[aria-pressed=true]::after{content:'✓';position:absolute;top:-13px;right:-13px;background:var(--teal);color:white;border-radius:50%;width:25px;height:25px;display:grid;place-items:center;font-size:17px;z-index:1}
.board-photo.reference{outline-color:#ad862a}
.board-photo:focus-visible{outline:4px solid #d99b12;outline-offset:3px}
.board-art{display:block;width:100%;height:100%;pointer-events:none}
.board-art .picture-frame,.stretch-picture .picture-frame{width:100%!important;height:100%!important;max-width:none!important;border:0;box-shadow:none}
.board-photo-title,.board-photo-size{position:absolute;white-space:nowrap;left:50%;transform:translateX(-50%);pointer-events:none;background:#fffdf7ed;border-radius:3px;padding:3px 5px;color:var(--ink)}
.board-photo-title{bottom:calc(100% + 6px);font-size:16px;font-weight:800}
.board-photo-size{top:calc(100% + 6px);font-size:12px;font-weight:600}
.board-photo-size:empty{display:none}
.shape-workshop{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);align-items:center}
.resize-board{position:relative;aspect-ratio:1;width:100%;max-width:440px;margin:16px auto 0;background-color:#fffdf7;background-image:linear-gradient(to right,#536d8138 1px,transparent 1px),linear-gradient(to bottom,#536d8138 1px,transparent 1px);background-size:6.25% 6.25%;outline:1px solid #aab7b4;border-radius:2px;isolation:isolate}
.resize-photo{position:absolute;outline:2px solid var(--teal);box-shadow:4px 4px #17324d1a}
.resize-photo .stretch-picture{display:block;min-height:0;position:absolute;inset:0;width:100%;height:100%;touch-action:none;user-select:none;cursor:grab}
.resize-photo .stretch-picture::after{content:'';position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(to right,#17324d26 1px,transparent 1px),linear-gradient(to bottom,#17324d26 1px,transparent 1px);background-size:calc(100% / var(--w)) calc(100% / var(--h))}
.resize-dimension{position:absolute;color:var(--teal);font-size:13px;font-weight:700;background:#fffdf7ed;padding:1px 4px;white-space:nowrap;pointer-events:none}
.width-dimension{bottom:calc(100% + 6px);left:50%;transform:translateX(-50%)}
.length-dimension{right:calc(100% + 6px);top:50%;writing-mode:vertical-rl;transform:translateY(-50%);letter-spacing:2px}
.resize-handle{position:absolute;display:grid;place-items:center;width:36px;height:36px;min-height:0;padding:0;border:0;border-radius:50%;background:transparent;color:white;touch-action:none;user-select:none;z-index:2;font-size:16px}
.resize-handle::before{content:'';position:absolute;inset:6px;background:var(--teal);border:2px solid white;outline:1px solid var(--teal);border-radius:5px;z-index:-1}
.resize-handle:hover:not(:disabled){background:transparent}
.resize-handle:hover::before{background:var(--ink)}
.handle-width{right:0;top:50%;transform:translate(50%,-50%);cursor:ew-resize}
.handle-length{left:50%;bottom:0;transform:translate(-50%,50%);cursor:ns-resize}
.handle-corner{right:0;bottom:0;transform:translate(50%,50%);cursor:nwse-resize}
.dragging,.stretch-picture.dragging{cursor:grabbing}
.picture-presets{display:flex;gap:7px;margin:10px 0 22px}
.picture-presets button{flex:1;min-width:0;padding:8px 6px}
@media(max-width:700px){.shape-workshop{grid-template-columns:1fr;gap:22px}.board-instruction{font-size:13px}.board-photo-title{font-size:14px}.board-photo-size{font-size:11px}.resize-board{max-width:400px}.board-scroll + .button-row button{white-space:normal;font-size:13px;padding:8px}.shape-workshop>div{min-width:0}}
.story-entry{display:flex;gap:20px;align-items:center;justify-content:space-between;text-decoration:none;color:var(--ink);background:#f7df8c;border:2px solid var(--ink);border-radius:9px;padding:16px 20px;margin:0 0 22px}.story-entry:hover{background:#f4d574}.story-entry strong{display:block;font-size:18px}.story-entry small{display:block;font-size:13px;margin-top:4px}.story-entry>b{white-space:nowrap;color:#076965;font-size:14px}@media(max-width:650px){.story-entry{flex-wrap:wrap;gap:10px;padding:15px}.story-entry strong{font-size:16px}}
.map-intro{display:flex;align-items:center;gap:24px;justify-content:space-between;margin:24px 28px 16px;padding:22px;background:#f5e5b1;border:1.5px solid #b8a16a;border-radius:10px}.map-intro h3{font-size:23px;margin:0}.map-intro p:not(.eyebrow){font-size:14px;margin:10px 0;max-width:700px}.map-intro>a{display:block;flex-shrink:0;white-space:nowrap;padding:13px 18px;border-radius:7px;background:var(--teal);color:white;font-weight:800;text-decoration:none;font-size:14px}.map-intro>a:hover{background:#086864}.map-intro-tags{display:flex;gap:7px;flex-wrap:wrap;font-size:11px;color:#64705d}.map-intro-tags span{background:#fff9e5;border-radius:4px;padding:3px 7px}.method-transition{margin:20px 28px 0;font-size:13px;color:#5c747e}@media(max-width:800px){.map-intro{display:block;margin:20px 16px 14px;padding:18px}.map-intro>a{margin-top:16px;text-align:center}.map-intro h3{font-size:21px}.method-transition{margin-inline:16px}}
/* Live shape feedback uses the original 6:4 proportions, independent of size. */
.resize-photo[data-proportional=true]{--picture-state-color:#21834a}.resize-photo[data-proportional=false]{--picture-state-color:#cb4037}.resize-photo[data-proportional]{outline:3px solid var(--picture-state-color)}.resize-photo[data-proportional] .resize-dimension{color:var(--picture-state-color)}.resize-photo[data-proportional] .resize-handle::before{background:var(--picture-state-color);outline-color:var(--picture-state-color)}.picture-proportion-status{border:2px solid #21834a;border-radius:10px;background:#ecf6e9;padding:16px;margin-bottom:20px;color:#21693c}.picture-proportion-status[data-proportional=false]{border-color:#cb4037;background:#fff0eb;color:#a6302a}.picture-proportion-status strong{font-size:18px;display:block}.picture-proportion-status p{font-size:16px;font-weight:700;margin:8px 0}.picture-proportion-status small{font-size:12px;line-height:1.8;display:block}.shape-workshop{border-top:0}
@media(max-width:700px){.picture-proportion-status{padding:13px;margin-bottom:16px}.picture-proportion-status strong{font-size:16px}}