/* The same sofa travels from a source slide to a lesson and a real choice. */
.material-story{--mt-night:#173e32;--mt-cream:#fff1d1;--mt-peach:#edb088;--mt-mint:#c5d4b9;--mt-ease:cubic-bezier(.2,.8,.2,1);container-type:inline-size;padding:0!important;background:transparent;border:0;box-shadow:none;min-width:0}
.mt-topline{display:flex;align-items:center;justify-content:space-between;gap:14px;font:500 11px/1.5 var(--mono);color:var(--green);margin:0 3px 14px;text-transform:uppercase;letter-spacing:.045em}
.mt-live{width:7px;height:7px;flex-shrink:0;border-radius:50%;background:var(--green);box-shadow:0 0 0 5px #1f4f3d10}
.mt-stage{position:relative;isolation:isolate;border-radius:16px;overflow:hidden;background:var(--mt-night);box-shadow:0 22px 48px -28px #163b2e80}
.mt-panel{padding:26px;min-width:0;position:relative}
.material-story.is-interactive .mt-stage{display:grid}
.material-story.is-interactive .mt-panel{grid-area:1/1;visibility:hidden;pointer-events:none;min-height:452px}
.material-story.is-interactive .mt-panel.is-active{visibility:visible;pointer-events:auto}
.mt-source{display:flex;flex-direction:column;justify-content:center;z-index:3;background:#e8e1d1}
.mt-document{background:#fffdf9;border:1px solid #c6bdab;border-radius:8px;box-shadow:0 16px 30px -22px #302f2870;overflow:hidden;transform:rotate(-1deg);transform-origin:bottom left}
.mt-filebar{display:flex;align-items:center;gap:8px;padding:10px 13px;background:#a24631;color:#fff7eb;font:10px/1.4 var(--mono)}
.mt-file-icon{font:700 13px/1 var(--body);display:grid;place-items:center;border:1px solid #ffffff60;border-radius:3px;width:21px;height:24px}
.mt-file-page{margin-left:auto;font-size:9px}
.mt-paper-content{position:relative;padding:25px 22px 130px;min-height:344px;font-family:Arial,sans-serif}
.mt-source-label{font:9px var(--mono);letter-spacing:.1em;color:#68717a}
.mt-paper-content h2{font:700 23px/1.15 Arial,sans-serif;color:#284b62;border-bottom:2px solid #284b62;margin:16px 0 18px;padding-bottom:12px;text-wrap:initial}
.mt-paper-content ul{padding-left:16px;font-size:13px;line-height:1.5;max-width:95%;color:#384650}
.mt-paper-content li+li{margin-top:7px}
.mt-source-sofa{position:absolute;width:160px;right:16px;bottom:2px;opacity:.9}
.mt-source-footer{position:absolute;bottom:19px;left:22px;font-size:9px;color:#67716a}
.mt-source-caption{font-size:12px;color:var(--muted);text-align:center;margin-top:16px}
.mt-lesson{background:var(--mt-night);color:var(--mt-cream);overflow:hidden}
.mt-brand{display:flex;align-items:center;gap:13px;font:400 27px/1 'Fraunces',Georgia,serif;letter-spacing:-1.2px;border-bottom:1px solid #fff1d126;padding-bottom:14px;position:relative;z-index:2}
.mt-brand>span{font:9px var(--mono);letter-spacing:.12em;color:#d1dac9}
.mt-brand .mt-lesson-number{margin-left:auto;font-size:9px;letter-spacing:.03em}
.mt-lesson-title{position:relative;z-index:2;margin-top:21px}
.mt-kicker{font:500 9px/1.5 var(--mono);letter-spacing:.09em;color:var(--mt-peach)}
.mt-panel h2{position:relative}
.mt-lesson-title h2{font:400 clamp(32px,3.1vw,46px)/1.04 'Fraunces',Georgia,serif;letter-spacing:-.045em;margin:10px 0 0;text-wrap:initial}
.mt-lesson-title h2 em{display:block;color:var(--mt-peach);font-weight:400;font-style:italic}
.mt-room{position:relative;height:46cqw;margin:8px -26px 0;isolation:isolate}
.mt-arch{position:absolute;right:16%;top:2px;width:37%;height:169px;background:var(--mt-peach);border-radius:100px 100px 0 0;transform-origin:bottom;box-shadow:inset -16px 0 0 #e7a47b}
.mt-orbit{position:absolute;width:40%;height:174px;border:1px solid #fff1d130;border-radius:100px 100px 0 0;top:-9px;right:12%}
.mt-floor{position:absolute;left:-15%;bottom:-15px;width:140%;height:95px;border-radius:50% 50% 0 0;background:#6b8871;transform:rotate(-3deg)}
.mt-room-line{position:absolute;left:0;right:0;bottom:52px;height:1px;background:#e3dbb52c;transform:rotate(-3deg)}
.mt-sofa{display:block;width:100%;height:auto;overflow:visible}
.mt-room>.mt-sofa{position:absolute;bottom:-3px;left:4%;width:92%;max-width:none;--sofa-back:#b8c9ae;--sofa-fill:#dae4ca;--sofa-shade:#8d9f85;filter:drop-shadow(0 14px 10px #0c251c2b)}
.mt-room-label{position:absolute;bottom:0;left:28px;color:#14392c;font:500 8px var(--mono);letter-spacing:.1em;z-index:2}
.mt-conversation{position:relative;z-index:3;display:flex;align-items:center;gap:12px;padding:13px 15px;margin-top:19px;background:var(--mt-cream);color:var(--mt-night);border-radius:9px 9px 9px 0;box-shadow:0 10px 24px -16px #071e1580}
.mt-conversation::before{content:'';position:absolute;left:0;top:-8px;border-bottom:10px solid var(--mt-cream);border-right:10px solid transparent}
.mt-conversation-mark{display:grid;place-items:center;width:26px;height:26px;flex-shrink:0;border-radius:50%;background:#ead5b2;font:italic 22px 'Fraunces',Georgia,serif}
.mt-conversation p{font-size:15px;line-height:1.35;font-weight:500}
.mt-takeaway{font-size:11px;line-height:1.4;color:#d1dac9;margin-top:10px}
.mt-quiz{display:flex;flex-direction:column;justify-content:center;background:#f8eedc;color:var(--mt-night)}
.mt-quiz-heading{display:grid;grid-template-columns:minmax(0,1fr) 116px;align-items:center;gap:16px;min-height:141px}
.mt-quiz .mt-kicker{color:#81513d}
.mt-quiz-heading h2{font:400 35px/1.06 'Fraunces',Georgia,serif;letter-spacing:-.04em;margin-top:10px;text-wrap:initial}
.mt-quiz-heading h2 em{display:block;font-style:italic;color:#935237}
.mt-quiz-art{position:relative;min-height:115px}
.mt-quiz-halo{position:absolute;inset:4px 3px 5px;background:#d0d9bb;border-radius:70px 70px 15px 15px;transition:background .35s}
.mt-quiz-art>.mt-sofa{position:relative;z-index:1;width:120%;max-width:none;margin-left:-10%}
.mt-success{position:absolute;right:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--green);color:var(--mt-cream);padding:8px;z-index:2;opacity:0;transform:scale(.5)}
.mt-success svg{width:100%}
.mt-answers{display:grid;gap:9px;margin-top:9px}
.mt-answer{display:flex;align-items:center;gap:11px;width:100%;padding:11px 12px;min-height:50px;border:1px solid #a69f8a;border-radius:8px;background:#fffaf0;color:var(--mt-night);font:500 14px/1.3 var(--body);text-align:left;cursor:pointer;transition:background .2s,border-color .2s,transform .2s}
.mt-answer:hover{background:#e5ead7;border-color:var(--green);transform:translateX(3px)}
.mt-answer-letter{display:grid;place-items:center;width:24px;height:24px;flex-shrink:0;border:1px solid #b7b8a5;border-radius:50%;font:10px var(--mono)}
.mt-answer-check{width:19px;flex-shrink:0;margin-left:auto;opacity:0}
.mt-answer[aria-pressed=true]{background:#eedcc4;border-color:#995c3c}
.mt-answer[aria-pressed=true][data-material-answer=true]{background:var(--green);border-color:var(--green);color:var(--mt-cream)}
.mt-answer[aria-pressed=true][data-material-answer=true] .mt-answer-check{opacity:1}
.mt-answer[aria-pressed=true][data-material-answer=true] .mt-answer-letter{border-color:#c5d4b950}
.mt-feedback{font-size:13px;line-height:1.5;margin-top:17px;min-height:4.5em;color:#425442}
.material-story[data-answer=correct] .mt-success{opacity:1;transform:scale(1);animation:mt-check-pop .6s var(--mt-ease) both}
.material-story[data-answer=correct] .mt-success path{stroke-dasharray:1;stroke-dashoffset:0;animation:mt-check-draw .5s ease-out .1s both}
.material-story[data-answer=correct] .mt-quiz-halo{background:#b6c9a2}
.mt-controls{padding-top:14px}
.mt-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));padding:4px;border:1px solid var(--line-2);border-radius:10px;background:#e8e0d1;gap:3px}
.mt-steps button{display:flex;align-items:center;justify-content:center;gap:8px;padding:11px 4px;min-height:44px;border:0;background:none;border-radius:7px;color:#415346;cursor:pointer;font:600 13px/1.2 var(--body);transition:background .2s,color .2s,box-shadow .2s}
.mt-steps button>span{font:9px var(--mono);opacity:.65}
.mt-steps button[aria-pressed=true]{background:var(--green);color:#fff6df;box-shadow:0 2px 5px #1f4f3d20}
.mt-steps button:not([aria-pressed=true]):hover{background:#f6efdf}
.mt-replay{display:flex;gap:7px;align-items:center;justify-content:center;min-height:40px;margin:3px auto 0;padding:7px 12px;border:0;background:none;color:var(--green);font:500 12px var(--body);cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.mt-replay svg{width:15px;height:15px}
.material-story>.story-caption{font-size:11px;line-height:1.5;margin:3px 3px 0;color:var(--muted)}
/* A finite scene build; animation never loops. All words exist from the start. */
.material-story.is-interactive .mt-source.is-leaving{visibility:visible;pointer-events:none;background:transparent;animation:mt-source-away .85s var(--mt-ease) both;transform-origin:bottom left}
.material-story.is-moving .mt-lesson.is-active .mt-arch{animation:mt-arch-build 1s var(--mt-ease) both}
.material-story.is-moving .mt-lesson.is-active .mt-orbit{animation:mt-rise .9s var(--mt-ease) .15s both}
.material-story.is-moving .mt-lesson.is-active .mt-floor{animation:mt-floor-build .9s var(--mt-ease) .1s both}
.material-story.is-moving .mt-lesson.is-active .mt-sofa-back{animation:mt-rise .85s var(--mt-ease) .2s both}
.material-story.is-moving .mt-lesson.is-active .mt-sofa-base{animation:mt-rise .8s var(--mt-ease) .05s both}
.material-story.is-moving .mt-lesson.is-active .mt-cushion{animation:mt-cushion-drop 1s var(--mt-ease) .4s both}
.material-story.is-moving .mt-lesson.is-active .mt-room-plant{animation:mt-rise 1s var(--mt-ease) .25s both}
.material-story.is-moving .mt-lesson.is-active .mt-lesson-title{animation:mt-title-in .7s var(--mt-ease) .25s both}
.material-story.is-moving .mt-lesson.is-active .mt-conversation{animation:mt-rise .6s var(--mt-ease) .75s both}
.material-story.is-moving .mt-quiz.is-active{animation:mt-quiz-in .5s var(--mt-ease) both}
@keyframes mt-source-away{0%{opacity:1;transform:none}80%,100%{opacity:0;transform:translate(-20px,70px) scale(.45);filter:blur(2px)}}
@keyframes mt-arch-build{from{transform:scaleY(.15);opacity:0}to{transform:scaleY(1);opacity:1}}
@keyframes mt-floor-build{from{transform:translateY(55px) rotate(-3deg);opacity:0}to{transform:translateY(0) rotate(-3deg);opacity:1}}
@keyframes mt-rise{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:translateY(0)}}
@keyframes mt-cushion-drop{from{opacity:0;transform:translateY(-48px)}to{opacity:1;transform:translateY(0)}}
@keyframes mt-title-in{from{opacity:0;transform:translateX(-22px);clip-path:inset(0 100% 0 0)}to{opacity:1;transform:none;clip-path:inset(0)}}
@keyframes mt-quiz-in{from{opacity:0;transform:translateY(12px) scale(.97)}to{opacity:1;transform:none}}
@keyframes mt-check-pop{from{opacity:0;transform:scale(.4)}70%{transform:scale(1.12)}to{opacity:1;transform:scale(1)}}
@keyframes mt-check-draw{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
@media(max-width:1100px) and (min-width:901px){.mt-panel{padding:21px}.mt-lesson-title h2{font-size:35px}.mt-room{margin-inline:-21px}.mt-quiz-heading{grid-template-columns:minmax(0,1fr) 90px}.mt-quiz-heading h2{font-size:31px}.mt-answer{font-size:13px}}
@media(max-width:640px){.mt-topline{font-size:10px}.mt-panel{padding:21px}.mt-brand{font-size:25px}.mt-lesson-title{margin-top:18px}.mt-lesson-title h2{font-size:35px}.mt-room{margin-inline:-21px}.mt-room>.mt-sofa{bottom:0}.mt-arch{height:152px;right:13%}.mt-orbit{height:158px;right:9%}.mt-conversation{margin-top:21px;padding:12px}.mt-conversation p{font-size:14px}.mt-takeaway{font-size:10px}.mt-quiz-heading{grid-template-columns:minmax(0,1fr) 88px;min-height:138px}.mt-quiz-heading h2{font-size:32px}.mt-quiz-art{min-height:92px}.mt-answer{font-size:14px;padding:12px 10px;gap:8px}.mt-feedback{font-size:12px}.mt-steps button{font-size:12px;gap:6px}.material-story.is-interactive .mt-panel{min-height:437px}.mt-paper-content{padding:22px 18px 125px}.mt-paper-content h2{font-size:22px}.mt-paper-content ul{font-size:12px}.mt-source-sofa{width:150px}}
@media(max-width:380px){.mt-panel{padding:18px}.mt-room{margin-inline:-18px}.mt-room>.mt-sofa{bottom:7px}.mt-lesson-title h2{font-size:31px}.mt-quiz-heading{grid-template-columns:minmax(0,1fr) 72px}.mt-quiz-heading h2{font-size:29px}.mt-quiz-art{min-height:83px}.mt-steps button>span{display:none}.mt-paper-content h2{font-size:20px}.mt-answers{gap:8px}.mt-answer{font-size:14px;min-height:52px}.mt-feedback{min-height:6em}}
@media(prefers-reduced-motion:reduce){.material-story *{animation:none!important;transition:none!important}.mt-source.is-leaving{visibility:hidden!important}.mt-answer:hover{transform:none}}
html.qa .material-story *{animation:none!important;transition:none!important}
html.qa .mt-source.is-leaving{visibility:hidden!important}