:root{--ink:#24304c;--muted:#626e85;--primary:#4b4eb7;--paper:#f6f8fc;--line:#dfe4ef;--yellow:#ffc955;--teal:#167e70;--radius:22px;font-family:ui-rounded,'Nunito','Segoe UI',system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;font-size:16px}
*{box-sizing:border-box}body{margin:0;line-height:1.6}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}button:disabled{cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #b36910;outline-offset:4px}button:focus:not(:focus-visible){outline:none}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.25;letter-spacing:-.025em}h1{font-size:clamp(2rem,4.5vw,3.65rem);font-weight:850}h2{font-size:clamp(1.5rem,2.5vw,2rem)}h3{font-size:1.18rem}button{color:var(--ink)}[hidden]{display:none!important}.skip-link{position:fixed;top:12px;left:20px;max-width:calc(100vw - 40px);transform:translateY(calc(-100% - 20px));background:var(--ink);color:white;padding:12px 22px;z-index:99;border-radius:12px}.skip-link:focus{transform:translateY(0)}
.site-header{background:white;border-bottom:1px solid var(--line)}.header-inner{max-width:1264px;margin:auto;padding:21px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;font-size:1.15rem;font-weight:850;line-height:1.35}.brand small{display:block;font-size:.875rem;font-weight:550;color:var(--muted);margin-top:2px}.brand-mark{display:grid;grid-template-columns:repeat(2,12px);gap:4px;background:var(--primary);padding:10px;border-radius:13px}.brand-mark i{display:block;width:12px;height:12px;background:#fff;border-radius:3px}.brand-mark i:first-child{background:var(--yellow)}.brand-mark i:nth-child(2){border-radius:50%}.brand-mark i:nth-child(3){background:#bdebdc}.brand-mark i:last-child{clip-path:polygon(0 0,100% 0,0 100%)}.progress-link{display:grid;grid-template-columns:auto auto;column-gap:8px;align-items:baseline;text-decoration:none}.progress-count{font-size:1rem;font-weight:800;color:var(--primary)}.progress-caption{color:var(--muted);font-size:.875rem}.mini-progress{height:5px;background:#ececf8;border-radius:9px;grid-column:1/-1;margin-top:5px;overflow:hidden}.mini-progress>span{display:block;background:var(--primary);height:100%;width:0;transition:width .3s}
#main{max-width:1264px;padding:0 32px;margin:auto;outline:none;min-height:70vh}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;padding:52px 0 44px;align-items:center}.eyebrow{font-size:.8rem;font-weight:800;letter-spacing:.1em;color:var(--primary);display:block;margin-bottom:17px}.hero h1{margin-bottom:18px}.hero h1 em{font-style:normal;color:var(--primary)}.hero p{font-size:1.125rem;color:var(--muted);max-width:460px;margin-bottom:26px}.hero-buttons{display:flex;gap:12px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:49px;padding:11px 22px;border:1.5px solid var(--line);border-radius:13px;background:white;font-weight:750;text-decoration:none;line-height:1.4;transition:transform .16s,background .16s}.button:hover{background:#f1f3fb;transform:translateY(-1px)}.button.primary{background:var(--primary);color:white;border-color:var(--primary);box-shadow:0 3px 0 #323487}.button.primary:hover{background:#3c3f9b}.button.small{min-height:44px;padding:8px 16px;font-size:.94rem}.button:disabled{opacity:.48;transform:none;box-shadow:none}.button.secondary{color:var(--primary);background:#fff;border-color:#d4d5ee}.button.arrow{font-size:1.1rem}.hero-demo{border-radius:26px;background:#eeedfb;border:1px solid #dadaf3;overflow:hidden;position:relative;transform:rotate(1deg)}.hero-demo-top{display:flex;align-items:center;justify-content:space-between;padding:18px 24px 0;gap:15px}.hero-demo-top span{color:var(--primary);font-weight:800;font-size:.9rem}.demo-tag{display:inline-block;padding:5px 12px;border:1px solid #c6c7e8;border-radius:8px;font-size:.8rem!important;background:white}.hero-scene{margin:-8px 12px 0}.hero-scene svg{display:block;width:100%;height:auto}.hero-demo-footer{padding:0 24px 22px;display:flex;justify-content:space-between;align-items:center;gap:12px}.hero-demo-footer p{font-size:.9rem;margin:0;max-width:190px;color:var(--ink)}.hero-demo-footer button{background:var(--yellow);border-color:#e6b549;box-shadow:0 3px 0 #d1a436;white-space:nowrap}
.catalog{padding-bottom:36px;scroll-margin-top:25px}.section-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 23px}.section-top h2{margin:0}.section-top p{color:var(--muted);margin:5px 0 0;font-size:.95rem}.search-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.search-wrap{position:relative;min-width:260px}.search-wrap input{width:100%;height:48px;border:1.5px solid #ccd3e1;border-radius:12px;padding:10px 42px 10px 16px;background:white;color:var(--ink)}.search-wrap button{position:absolute;right:5px;top:4px;width:39px;height:39px;background:none;border:0;font-size:1.4rem;border-radius:9px}.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}select{height:48px;padding:8px 35px 8px 12px;border:1.5px solid #ccd3e1;border-radius:12px;background:white;max-width:100%}.filters{display:flex;gap:9px;flex-wrap:wrap;margin:0 0 22px}.filter{border:1px solid #dce1ea;background:white;min-height:43px;padding:8px 15px;border-radius:100px;font-size:.9rem;line-height:1.4;font-weight:650}.filter:hover{border-color:var(--primary)}.filter[aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink)}.results-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px;color:var(--muted);font-size:.9rem}.results-bar p{margin:0}.text-button{border:0;background:none;color:var(--primary);text-decoration:underline;text-underline-offset:4px;min-height:44px;padding:8px;font-weight:650}.card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:17px}.lesson-card{background:white;border:1px solid var(--line);border-radius:18px;position:relative;transition:transform .16s,box-shadow .16s;min-width:0;display:flex;flex-direction:column;overflow:hidden}.lesson-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px #303b5b0c}.card-link{display:block;text-decoration:none;flex:1;padding:21px 20px 13px;min-height:213px}.card-number{display:flex;width:46px;height:46px;align-items:center;justify-content:center;border-radius:13px;background:var(--tint);color:var(--accent);font-size:1.25rem;font-weight:850;margin-bottom:18px}.card-link h3{font-size:1.13rem;margin-bottom:7px;line-height:1.35;letter-spacing:-.012em;padding-right:1px}.card-link p{font-size:.93rem;color:var(--muted);margin:0;line-height:1.5}.card-favorite{position:absolute;right:10px;top:16px;min-height:44px;min-width:44px;border:0;background:transparent;color:#77768c;font-size:1.55rem;border-radius:9px}.card-favorite[aria-pressed=true]{color:#9b6308;background:#fff6dc}.card-footer{border-top:1px solid #eef0f5;margin:0 20px;padding:12px 0 15px;display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:.8rem;color:var(--muted);line-height:1.3}.card-footer .done{font-weight:750;color:var(--teal)}.card-go{font-size:1.2rem;color:var(--accent)}.empty-state{padding:52px 24px;background:white;border:1px dashed #c8cddc;border-radius:20px;text-align:center;grid-column:1/-1}.empty-state h3{font-size:1.4rem}.empty-state p{color:var(--muted)}.complete-banner{background:#e3f4eb;border:1px solid #b2d7c3;border-radius:16px;padding:20px 24px;margin-bottom:24px}.complete-banner h3{margin-bottom:6px}.complete-banner p{margin:0}
.lesson-nav{padding:23px 0;display:flex;justify-content:space-between;align-items:center;gap:12px}.back-link{color:var(--muted);text-decoration:none;font-weight:650;font-size:.94rem;display:inline-flex;align-items:center;min-height:44px}.back-link:hover{color:var(--primary)}.lesson-nav-controls{display:flex;gap:8px;align-items:center}.lesson-nav-controls .counter{font-size:.9rem;color:var(--muted);padding:0 5px}.lesson-heading{display:flex;align-items:flex-start;gap:19px;margin:10px 0 28px}.lesson-number{flex:0 0 auto;display:grid;place-items:center;width:72px;height:72px;background:var(--tint);color:var(--accent);border-radius:20px;font-weight:850;font-size:2rem}.lesson-heading h1{font-size:clamp(1.8rem,3.3vw,2.9rem);margin:5px 0 10px}.lesson-heading .formal-name{color:var(--muted);margin:0;font-size:.96rem}.lesson-heading .eyebrow{margin:0;font-size:.8rem;color:var(--accent)}.lesson-heading .favorite-button{margin-left:auto;flex-shrink:0}.favorite-button{border:1.5px solid var(--line);border-radius:13px;min-height:46px;min-width:46px;background:white;padding:10px 14px;color:var(--muted);font-weight:650;display:flex;gap:7px;align-items:center}.favorite-button[aria-pressed=true]{background:#fff6dc;border-color:#e7cd91;color:#79510d}.favorite-button b{font-size:1.25rem}.experiment{display:grid;grid-template-columns:1.2fr 1fr;gap:0;border:1px solid var(--line);background:white;border-radius:var(--radius);overflow:hidden;margin-bottom:28px}.experiment-left{padding:25px;background:var(--tint);border-right:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between;min-width:0}.step-heading{display:flex;align-items:center;gap:9px;font-size:1rem;font-weight:800;margin:0;color:var(--ink)}.step-heading .step{width:27px;height:27px;display:grid;place-items:center;border-radius:8px;background:var(--ink);color:white;font-size:.85rem;flex-shrink:0}.model{margin:8px -14px;flex:1;display:flex;align-items:center}.model svg{display:block;width:100%;height:auto}.scene-caption{display:flex;justify-content:space-between;gap:15px;align-items:center;font-size:.87rem;color:var(--muted)}.scene-caption .state-name{background:white;border:1px solid #cdd5e3;padding:5px 10px;border-radius:8px;color:var(--accent);font-weight:750}.scene-dots{display:flex;gap:6px}.scene-dots span{width:7px;height:7px;border-radius:50%;background:#b9c3d7}.scene-dots span.active{background:var(--accent)}.experiment-right{padding:27px 30px;display:flex;flex-direction:column;justify-content:center;min-width:0}.experiment-right h2{font-size:1.16rem;margin-bottom:13px}.problem{font-size:1.125rem;line-height:1.75;margin-bottom:21px}.experiment-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:18px}.experiment-actions .primary{background:var(--accent);border-color:var(--accent);box-shadow:none}.observation{border-left:3px solid var(--accent);padding:5px 0 5px 15px;font-size:1rem;line-height:1.7;min-height:92px}.observation p{margin:0}.observation b{color:var(--accent);font-size:.88rem;display:block;margin-bottom:5px}.notice{background:#fff5dc;border:1px solid #e6d098;color:#71521d;padding:14px 18px;border-radius:12px;font-size:.92rem;line-height:1.6;margin:0 0 25px}.learning-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:25px;margin-bottom:26px}.quiz,.takeaway{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:26px;min-width:0}.quiz h2{font-size:1.23rem;line-height:1.5;margin:21px 0 17px;letter-spacing:-.01em}.answers{display:grid;gap:10px}.answer{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:14px 16px;min-height:60px;border:1.5px solid #dce1eb;border-radius:13px;background:white;line-height:1.55;font-weight:550}.answer .letter{flex-shrink:0;width:29px;height:29px;border-radius:8px;background:#f0f2f8;display:grid;place-items:center;font-size:.88rem;font-weight:750}.answer:hover:not(:disabled){border-color:var(--primary);background:#f7f7ff}.answer:disabled{color:#748096;background:#fafbfc}.answer.correct{background:#e7f5ed;border-color:#43906e}.answer.correct .letter{background:var(--teal);color:white}.answer.incorrect{background:#fff4df;border-color:#c99546}.quiz-hint{color:var(--muted);font-size:.92rem;margin:15px 0 0}.feedback{padding:16px 18px;border-radius:12px;background:#fff4df;margin-top:16px;line-height:1.65}.feedback p{margin:5px 0 0}.feedback.success{background:#e7f5ed;color:#18553c}.takeaway h3{font-size:1.13rem;margin:24px 0 10px}.takeaway p{margin-bottom:14px;color:#46546c}.idea-summary{color:var(--ink)!important;font-size:1.15rem;font-weight:750;line-height:1.7;margin-top:22px}.real-example{border-top:1px solid var(--line);padding-top:16px}.real-example b{display:block;font-size:.84rem;letter-spacing:.045em;margin-bottom:5px;color:var(--accent)}.notebook{border-top:1px solid var(--line);padding-top:15px;margin-top:18px}.notebook label{display:block;font-weight:750;margin-bottom:9px;font-size:.96rem}.notebook textarea{width:100%;min-height:110px;resize:vertical;border:1.5px solid #cbd3e2;padding:12px 14px;border-radius:11px;line-height:1.6;background:#fcfdff;color:var(--ink)}.note-meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:.8rem;margin-top:4px}.lesson-end{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:30px 0 40px}.lesson-end p{color:var(--muted);margin:0;max-width:560px}.lesson-end .button{flex-shrink:0}.site-footer{max-width:1200px;margin:0 auto;padding:25px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;color:var(--muted);font-size:.87rem}.storage-notice{padding:12px 24px;background:#fff1cf;color:#71521d;margin:0;text-align:center}.no-script{padding:50px;max-width:800px;margin:auto}dialog{border:1px solid var(--line);border-radius:22px;box-shadow:0 25px 90px #1b274638;max-width:min(620px,calc(100vw - 36px));padding:38px;color:var(--ink)}dialog::backdrop{background:#18223f70}dialog p{color:#515d74;line-height:1.8}dialog h2{margin-top:10px}dialog .eyebrow{margin-top:14px}.dialog-close{position:absolute;top:8px;right:12px;width:44px;height:44px;font-size:1.8rem;background:transparent;border:0;border-radius:12px}.model-svg{animation:appear .25s ease-out}@keyframes appear{from{opacity:.25;transform:translateY(3px)}to{opacity:1;transform:none}}
@media(min-width:1450px){.hero{padding-top:64px;padding-bottom:56px}}
@media(max-width:1040px){.card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.hero{gap:24px}.hero-demo-footer{flex-direction:column;align-items:stretch}.hero-demo-footer p{max-width:none}.section-top{align-items:flex-start;flex-direction:column}.search-tools{width:100%}.search-wrap{flex:1}.experiment-right{padding:24px}.hero h1{font-size:2.65rem}.site-footer{margin:0 32px}}
@media(max-width:760px){#main{padding:0 20px}.header-inner{padding:17px 20px}.hero{grid-template-columns:1fr;gap:26px;padding:34px 0}.hero h1{font-size:2.5rem;max-width:520px}.hero p{max-width:520px}.hero-demo{transform:none;max-width:540px;width:100%;justify-self:center}.hero-demo-footer{flex-direction:row;align-items:center}.hero-scene{max-height:240px;overflow:hidden}.hero-scene svg{max-height:252px}.hero-demo-top{padding:14px 20px 0}.hero-demo-footer{padding:0 20px 18px}.hero-demo-footer p{max-width:185px;font-size:.85rem}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.card-link{padding:18px 16px 12px;min-height:205px}.card-footer{margin:0 16px}.filters{gap:8px}.filter{font-size:.85rem;padding:8px 13px}.experiment{grid-template-columns:1fr}.experiment-left{border-right:0;border-bottom:1px solid var(--line);padding:22px}.experiment-right{padding:24px}.model{max-height:350px;justify-content:center}.model svg{max-height:350px;width:100%}.learning-grid{grid-template-columns:1fr;gap:20px}.lesson-heading{gap:13px}.lesson-number{width:57px;height:57px;font-size:1.65rem;border-radius:16px}.lesson-heading h1{font-size:1.9rem;margin-bottom:8px}.lesson-heading .favorite-button{padding:9px}.favorite-button .favorite-text{display:none}.lesson-nav{padding:17px 0}.lesson-nav-controls .button{padding:8px 12px}.lesson-nav-controls .nav-word{display:none}.lesson-end{align-items:flex-start;flex-direction:column}.site-footer{margin:0 20px;align-items:flex-start}.site-footer span{padding-top:10px}.progress-caption{font-size:.78rem}.formal-name{font-size:.9rem!important}.observation{min-height:0}}
@media(max-width:420px){.brand{font-size:1rem;gap:9px}.brand-mark{padding:8px;grid-template-columns:repeat(2,10px);gap:3px}.brand-mark i{width:10px;height:10px}.brand small{font-size:.76rem}.progress-link{column-gap:4px}.progress-caption{display:none}.progress-count{font-size:.9rem}.hero h1{font-size:2.22rem}.hero-demo-footer{align-items:stretch;flex-direction:column}.hero-demo-footer p{max-width:none}.hero-demo-top{gap:7px}.hero-demo-top span{font-size:.8rem}.search-tools{gap:10px}.search-wrap{min-width:100%}select{width:100%}.card-link h3{font-size:1rem}.card-link p{font-size:.87rem}.card-link{min-height:214px;padding:17px 13px 11px}.card-number{width:41px;height:41px;font-size:1.15rem}.card-footer{margin:0 13px;font-size:.76rem}.card-favorite{right:4px;top:14px}.quiz,.takeaway{padding:21px}.experiment-right{padding:21px}.lesson-heading{position:relative;padding-right:40px}.lesson-heading .favorite-button{position:absolute;right:0;top:1px;min-width:39px;min-height:42px}.lesson-heading h1{font-size:1.7rem}.lesson-number{width:47px;height:47px;font-size:1.4rem}.lesson-nav-controls{gap:5px}.lesson-nav-controls .counter{display:none}.site-footer{flex-direction:column;gap:0}.hero .eyebrow{font-size:.75rem}.button{padding:11px 16px}dialog{padding:25px}.scene-caption{font-size:.8rem}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.lesson-card:hover,.button:hover{transform:none}}

/* Vector illustrations: material detail, readable captions, bounded purposeful motion. */
.triz-illustration{margin:0;width:100%;min-width:0}.triz-illustration .model-svg{width:100%;height:auto;display:block;animation:none}.triz-illustration figcaption{text-align:center;font-size:1rem;font-weight:750;line-height:1.55;padding:7px 20px 15px;color:var(--ink);max-width:560px;margin:0 auto}.model-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}.art-open{background:#ffffffc9;border:1px solid #bdc7db;border-radius:10px;padding:9px 11px;min-height:44px;font-size:.85rem;font-weight:700;color:var(--ink)}.art-open:hover{background:#fff}.model{margin:12px -14px 10px}.hero-scene{overflow:visible}.hero-scene .model-svg{max-height:none}.hero-scene figcaption{font-size:.9rem;padding-bottom:16px}.hero-demo-footer{padding-top:8px}.model svg{max-height:none}.model .triz-illustration{align-self:center}.art-motion{transform-box:fill-box;transform-origin:center;animation-duration:.75s;animation-iteration-count:1;animation-timing-function:ease-out}.art-lift{animation-name:art-lift}.art-travel{animation-name:art-travel}.art-shake{animation-name:art-shake;animation-duration:.8s}.art-pulse{animation-name:art-pulse;animation-duration:1s}.art-spin{animation-name:art-spin;animation-duration:1s}@keyframes art-lift{from{transform:translateY(12px)}to{transform:translateY(0)}}@keyframes art-travel{from{transform:translateX(-16px)}to{transform:translateX(0)}}@keyframes art-shake{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-4px)}40%,80%{transform:translateX(4px)}}@keyframes art-pulse{0%,100%{opacity:1}45%{opacity:.55}}@keyframes art-spin{from{transform:rotate(-80deg)}to{transform:rotate(0)}}
.illustration-dialog{width:1120px;max-width:calc(100vw - 30px);max-height:calc(100dvh - 30px);padding:27px 30px 20px}.illustration-dialog>.eyebrow{font-size:.77rem;margin:0 35px 10px 0}.illustration-dialog h2{font-size:1.6rem;margin:0 35px 20px 0}.art-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:15px}.art-view-toggle,.art-zoom-controls{display:flex;align-items:center;gap:5px}.art-view-toggle button,.art-state-buttons button{border:1px solid #cbd2df;background:#fff;border-radius:10px;padding:9px 14px;min-height:44px;line-height:1.45;font-weight:650;font-size:.9rem}.art-view-toggle button[aria-pressed=true],.art-state-buttons button[aria-pressed=true]{background:var(--primary);color:white;border-color:var(--primary)}.art-zoom-controls button{width:44px;height:44px;border:1px solid #cbd2df;background:white;border-radius:10px;font-size:1.4rem}.art-zoom-controls button:disabled{color:#9aa4b7;background:#f4f5f9}.art-zoom-controls output{font-size:.88rem;min-width:52px;text-align:center;font-variant-numeric:tabular-nums}.art-state-buttons{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}.art-viewport{max-height:64dvh;overflow:auto;background:var(--tint,#edf1fc);border:1px solid var(--line);border-radius:17px;overscroll-behavior:contain}.art-canvas{min-width:100%;padding:18px}.art-canvas>.triz-illustration{max-width:none}.art-canvas .model-svg{max-height:none}.art-canvas figcaption{font-size:1.1rem}.art-comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.art-comparison-step{min-width:0;background:#ffffffc9;border:1px solid #cbd4e5;border-radius:15px;padding:16px 8px 8px}.art-comparison-step h3{font-size:1.05rem;margin:0 14px 8px;line-height:1.5}.art-comparison-step>p{font-size:.96rem;line-height:1.65;margin:12px 14px;color:#46546c}.art-comparison-step figcaption{font-size:.93rem;padding:0 12px 8px}.art-help{margin:14px 0 0;font-size:.875rem}.art-viewport:focus-visible{outline:3px solid #b36910;outline-offset:3px}
@media(max-width:760px){.hero-scene{max-height:none}.hero-scene svg{max-height:none}.model{max-height:none;margin-top:5px}.model svg{max-height:none}.triz-illustration figcaption{padding:6px 12px 12px;font-size:1rem}.model-heading .step-heading{font-size:.94rem}.art-open{font-size:.8rem;padding:7px 9px}.illustration-dialog{padding:22px 14px 15px;max-width:calc(100vw - 16px);max-height:calc(100dvh - 16px)}.illustration-dialog h2{font-size:1.25rem}.art-toolbar{gap:9px}.art-view-toggle button{padding:8px 11px;font-size:.83rem}.art-state-buttons button{padding:7px 10px;font-size:.82rem}.art-canvas{padding:6px}.art-comparison{grid-template-columns:1fr;gap:12px}.art-viewport{max-height:58dvh}.art-comparison-step{padding:13px 6px}.art-comparison-step figcaption{font-size:1rem}.art-canvas>.triz-illustration figcaption{font-size:1rem;padding:10px}.art-help{font-size:.82rem}}
@media(prefers-reduced-motion:reduce){.art-motion{animation:none!important}}

/* A second context helps children recognize the idea beyond one object. */
.extra-example{margin:28px 0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;min-width:0}
.extra-example-header{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap}
.extra-example-header .eyebrow{color:var(--accent);font-size:.78rem;margin:0 0 8px}
.extra-example-header h2{font-size:1.5rem;line-height:1.4;margin:0;scroll-margin-top:110px}
.extra-example-header .art-open{flex-shrink:0}
.extra-example-problem{max-width:850px;font-size:1.06rem;line-height:1.75;margin:17px 0 22px}
.example-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.example-stage{min-width:0;border:1px solid var(--line);border-radius:18px;background:var(--tint);padding:18px 10px 15px}
.example-stage h3{font-size:1.05rem;line-height:1.55;margin:0 12px 12px}
.example-stage>p{font-size:.97rem;line-height:1.7;margin:7px 12px 0;color:#46546c}
.example-stage figcaption{font-size:1rem;padding:8px 12px 10px}
.example-reasoning{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:25px}
.example-reasoning h3{font-size:1.08rem;margin:0 0 9px}
.example-reasoning p{color:#46546c;line-height:1.75;margin:0}
.example-hint{margin-top:12px;border:1px solid var(--line);border-radius:12px;background:#fafbff}
.example-hint summary{cursor:pointer;min-height:44px;padding:10px 15px;font-weight:650;color:var(--primary);border-radius:12px}
.example-hint p{padding:0 15px 15px;font-size:.96rem}
.example-jump{display:block;text-align:left;min-height:44px;margin-top:-5px}
/* Labels respond to the figure width, including comparison cards and zoom. */
.triz-illustration{container-type:inline-size}
.scene-phase{margin:8px 12px 0;text-align:center;font-size:1rem;font-weight:750;color:var(--ink)}
.scene-key,.scene-legend{display:none}
.scene-legend{list-style:none;margin:0;padding:0 12px 10px;gap:8px;text-align:left}
.scene-legend li{display:flex;align-items:baseline;gap:10px;font-size:1rem;line-height:1.5;color:var(--ink)}
.scene-legend li>span{flex:none;display:inline-grid;place-items:center;min-width:1.6em;border:1px solid var(--ink);border-radius:50%;font-weight:750;background:white}
@container (max-width:480px){.scene-label,.scene-tag{display:none}.scene-key{display:inline}.scene-legend{display:grid}}
@supports not (container-type:inline-size){.scene-label,.scene-tag{display:none}.scene-key{display:inline}.scene-legend{display:grid}}
.art-comparison-step figcaption{font-size:1rem}
.context-comparison h4{font-size:1rem;line-height:1.5;margin:0 12px 10px}
.boot-status{margin:40px 0;padding:26px;border:1px solid var(--line);border-radius:var(--radius);background:white}
.boot-status h1{font-size:1.7rem}.boot-status details{margin-top:24px}.boot-status code{overflow-wrap:anywhere}
#asset-notice{padding:16px;margin:0;background:#fff1cf;color:#553b10}
.beginner-path{margin:0 0 32px;padding:22px 26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.beginner-path h2{font-size:1.25rem;margin-bottom:8px}.beginner-path p{margin-bottom:12px;color:var(--muted)}
.beginner-path ol{display:flex;flex-wrap:wrap;list-style:none;padding:0;margin:0;gap:10px}
.beginner-path a{display:block;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:10px;color:var(--primary);text-underline-offset:3px}
.prediction-panel,.practice-panel{padding:26px;margin:0 0 28px;border:1px solid var(--line);border-radius:var(--radius);background:white}
.prediction-layout{display:grid;grid-template-columns:1fr 1fr;align-items:start;gap:28px}.prediction-layout>div{min-width:0}
.prediction-layout>div:first-child{background:var(--tint);border-radius:16px;padding:12px}
.prediction-panel h2,.practice-panel h2{font-size:1.5rem}.prediction-question{font-size:1.12rem;font-weight:700}
.prediction-panel label,.practice-panel label{display:block;font-weight:650;margin:14px 0 8px}
[data-reflection]{width:100%;min-height:90px;resize:vertical;border:1.5px solid #cbd3e2;border-radius:12px;padding:12px;line-height:1.6;color:var(--ink);background:#fcfdff}
.practice-panel h3{margin-top:24px}.practice-panel p{max-width:850px}
.practice-panel details,.recall-panel{padding:10px 16px;border:1px solid var(--line);border-radius:12px;background:#f6f8fc;margin:16px 0}
.practice-panel summary,.recall-panel summary,.boot-status summary{cursor:pointer;padding:10px 0;min-height:44px;font-weight:650;color:var(--primary)}
.practice-panel details p,.recall-panel p{margin:8px 0}.recall-panel{margin-top:0}
.reflection-status,.practice-note,#reflection-help{color:var(--muted);font-size:1rem}
#experiment-heading:focus{outline:3px solid #b36910;outline-offset:5px}
@media(max-width:760px){.prediction-layout{grid-template-columns:1fr;gap:20px}.prediction-panel,.practice-panel,.beginner-path{padding:20px 16px}.prediction-layout>div:first-child{padding:4px}.hero-scene{overflow:visible}.card-grid{gap:12px}}
@media(max-width:760px){
  .extra-example{padding:21px 16px;margin:24px 0}
  .extra-example-header{gap:12px}
  .extra-example-header h2{font-size:1.3rem}
  .extra-example-problem{font-size:1rem;margin:16px 0 19px}
  .example-pair,.example-reasoning{grid-template-columns:1fr;gap:17px}
  .example-stage{padding:16px 6px}
  .example-stage h3{font-size:1rem}
  .example-reasoning{margin-top:22px;gap:24px}
}