:root{--paper:#f8f6ee;--card:#fffefa;--ink:#243d36;--muted:#70776d;--green:#2c6453;--orange:#dd6b3e;--line:#e0e3d7;--soft:#eaf0df;--blue:#e6eef1;--yellow:#f4e7b1;--radius:24px;font-family:'Avenir Next','Trebuchet MS',Arial,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #c55f34;outline-offset:4px}a{color:inherit;text-decoration:none}button{color:inherit}h1,h2,h3,p{margin:0}h1{font-size:clamp(38px,4.5vw,66px);line-height:1.08;letter-spacing:-2.5px;font-weight:650}h2{font-size:28px;letter-spacing:-.7px;font-weight:650}h3{font-size:20px;font-weight:650}p{line-height:1.6}.shell{max-width:1440px;margin:auto;padding:0 56px}.topbar{height:94px;border-bottom:1px solid 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input{font-size:13px}.lesson-head{align-items:start;gap:12px}.lesson-head h1{font-size:29px}.lesson-head>.btn{font-size:11px;padding:10px 13px;min-height:40px;flex-shrink:0}.lesson-layout{display:block}.side{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-bottom:17px}.step-btn{font-size:11px;padding:11px 9px;gap:7px;border:1px solid var(--line)}.step-no{width:22px;height:22px;font-size:10px}.step-detail,.side-note{display:none}.activity{padding:18px;border-radius:20px}.activity-head h2{font-size:22px}.activity-head p{font-size:12px}.activity-head .pill{font-size:10px;padding:6px 9px}.speak-grid{grid-template-columns:1fr}.speak-card img{aspect-ratio:16/9}.speak-copy{padding:17px}.speak-actions{flex-wrap:nowrap}.activity-foot{flex-wrap:wrap}.activity-foot .btn{width:100%}.flash-card img{height:210px}.flash-word h3{font-size:30px}.flash-controls{gap:7px}.flash-controls .btn{padding:12px 17px;font-size:12px}.word-dot{width:26px;height:26px}.word-dots{gap:5px}.quiz-image img{height:190px}.option{padding:14px 12px;font-size:15px;gap:8px;min-height:59px}.options{gap:9px}.feedback{padding:15px;flex-wrap:wrap}.feedback .btn{width:100%}.progress-grid{gap:9px}.progress-tile{padding:16px 12px;border-radius:15px}.progress-tile b{font-size:28px}.progress-tile p{font-size:10px}.progress-tile .eyebrow{font-size:9px;letter-spacing:1px}.report-row{grid-template-columns:1fr 54px 45px 12px;padding:16px 13px;gap:8px;font-size:11px}.result h2{font-size:28px}.score-row{gap:27px}.result-actions{flex-direction:column}.hero-actions .btn{padding:13px 20px}.empty{padding:35px 15px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;transform:none!important}}

@media(max-width:700px){.topbar{height:auto;min-height:104px;flex-wrap:wrap;gap:10px;padding:15px 0 0}.brand{font-size:23px;white-space:nowrap}.brand-mark{flex-shrink:0}.nav{width:100%;justify-content:space-between;gap:16px;font-size:12px}.nav a{padding:9px 4px 12px}.sticker{bottom:65px;padding:11px 16px}.scene-caption{font-size:11px;gap:8px}.scene-caption span{width:22px;height:22px}}

.icon-btn.playing{background:var(--soft);border-color:var(--green);color:var(--green)}

/* Keep activity navigation available while reading long lessons. */
.side{position:sticky;top:20px;align-self:start;max-height:calc(100dvh - 40px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}
.step-btn{transition:background .15s,color .15s}.step-btn:hover:not(.active){background:var(--soft);color:var(--green)}
#activity{scroll-margin-top:20px}.icon-btn.playing{background:var(--green);color:white}
@media(max-width:700px){.side{top:0;z-index:20;max-height:none;overflow:visible;background:var(--paper);padding:10px 0;margin-bottom:12px;border-bottom:1px solid var(--line)}.step-btn{min-height:52px;background:var(--card)}#activity{scroll-margin-top:84px}.icon-btn,.word-dot{min-height:44px}.word-dot{min-width:32px}.word-dots{flex-wrap:wrap}}