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.live-setup .lib-head h2{font-family:var(--font-display);font-size:20px;letter-spacing:-.01em}
.live-setup .lib-count{min-width:28px;height:28px;padding:0 9px;display:inline-grid;place-items:center;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:700;font-size:13px}
.live-setup .lib-list{border:0;gap:8px}
.live-setup .lib-list li{flex-wrap:nowrap;padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:#fff;transition:border-color .15s,box-shadow .15s}
.live-setup .lib-list li+li{border-top:1px solid var(--line)}
.live-setup .lib-list li:hover{border-color:#d4c2ea;box-shadow:0 10px 24px -20px #3a0a5a}
.live-setup .lib-main{flex:1}
.live-setup .lib-main b{font-size:15px}
.live-setup .lib-actions{flex:none}
@media (max-width:960px){.live-setup .setup-grid{grid-template-columns:minmax(0,1fr)}}
@media (max-width:560px){.live-setup:not(.is-quests){padding:16px 12px}.live-setup .live-tabs{width:100%;justify-content:flex-start}.live-setup .setup-card{padding:22px 18px}.live-setup .setup-brand h1{font-size:24px}.live-setup .lib-list li{flex-wrap:wrap}}
.live-setup .setup-form .setup-check input{min-height:0;height:18px;margin-top:2px}
.live-setup .setup-form label.setup-check{align-items:center}
@media (max-width:560px){.live-setup .live-tabs{gap:2px}.live-setup .live-tabs button,.live-setup .live-tabs .tab-link{padding:0 11px;font-size:14px}}
/* Lesson pictures and animated drawings (visual type "image", question "image"). */
.em-img{display:flex;justify-content:center;align-items:center;margin:10px auto;width:100%}
.em-img img{display:block;max-width:100%;height:auto;max-height:260px;object-fit:contain;border-radius:12px}
.em-img.em-img-small img{max-height:150px}.em-img.em-img-large img{max-height:340px}
.em-img.is-big img{max-height:44vh}.em-img.is-big.em-img-small img{max-height:26vh}.em-img.is-big.em-img-large img{max-height:58vh}
.ss-visual .em-img img,.cs-visual .em-img img{width:auto}
.em-anim-fade img{animation:emImgFade .6s ease-out both}
.em-anim-rise img{animation:emImgRise .7s cubic-bezier(.2,.8,.2,1) both}
.em-anim-zoom img{animation:emImgZoom .7s cubic-bezier(.2,.8,.2,1) both}
.em-anim-pop img{animation:emImgPop .55s cubic-bezier(.3,1.6,.5,1) both}
.em-anim-slide img{animation:emImgSlide .7s cubic-bezier(.2,.8,.2,1) both}
.em-anim-float img{animation:emImgFade .6s ease-out both,emImgFloat 4s ease-in-out .6s infinite}
@keyframes emImgFade{from{opacity:0}to{opacity:1}}
@keyframes emImgRise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
@keyframes emImgZoom{from{opacity:0;transform:scale(.85)}to{opacity:1;transform:none}}
@keyframes emImgPop{0%{opacity:0;transform:scale(.6)}100%{opacity:1;transform:none}}
@keyframes emImgSlide{from{opacity:0;transform:translateX(-40px)}to{opacity:1;transform:none}}
@keyframes emImgFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@media (prefers-reduced-motion:reduce){.em-img img{animation:none!important}}
/* Fit slide pictures inside the slide canvas: the picture shrinks to the space left under the text. */
.stage-slide:not(.no-visual):not(.is-summary) .ss-visual:has(.em-img){grid-row:3 / 5;margin-top:0}
.stage-slide .ss-visual:has(.em-img){align-self:stretch;height:100%;min-height:0;overflow:hidden;justify-content:center}
.stage-slide .ss-visual .em-img.is-big{flex:1 1 0;min-height:0;margin:0;height:100%}
.stage-slide .ss-visual .em-img.is-big img{height:100%;max-height:100%;width:auto;max-width:100%}
.stage-slide .ss-visual .em-img.is-big.em-img-small img{max-height:60%}

.stage-nav{position:absolute;right:120px;bottom:6px;z-index:10;display:flex;gap:10px}
.stage-nav-btn{width:64px;height:48px;border-radius:12px;border:2px solid rgba(255,255,255,.55);background:rgba(255,255,255,.14);color:#fff;font-size:34px;line-height:1;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0 0 4px}
.stage-nav-btn:hover:not(:disabled){background:rgba(255,255,255,.28)}
.stage-nav-btn.next{width:96px;background:#fff;color:var(--brand);border-color:#fff}
.stage-nav-btn.next:hover:not(:disabled){background:#f1e9fb}
.stage-nav-btn:disabled{opacity:.3;cursor:default}
/* Live start page: simple and pastel; the lesson library has its own tab */
.live-setup:not(.is-quests){background:linear-gradient(160deg,#f8f4ff 0%,#f1f7ff 55%,#f3fbf7 100%)}
.live-setup .setup-grid.is-start{grid-template-columns:minmax(0,460px)}
.live-setup .setup-grid.is-library{grid-template-columns:minmax(0,640px)}
.live-setup .setup-card[hidden]{display:none!important}
.live-setup .setup-card{border-color:#eee7fb;box-shadow:0 12px 40px -26px rgba(123,63,242,.35)}
.live-setup .setup-card:not(.library)::before{height:4px;background:linear-gradient(90deg,#dccbff,#c9dcff,#c8efdd)}
.live-setup .setup-brand{border-bottom:0;padding-bottom:0}
.live-setup .setup-form select,.live-setup .setup-form input{background:#fbf9ff;border-color:#e7dff6}
.live-setup .setup-form label.setup-check{background:#f0faf5;border:1px solid #d5eee2}
.live-setup #live-code{background:#f4efff;color:#5b2bb5;border-color:#e3d8fb}
.live-setup .btn.primary.lg,.live-setup .btn.primary.lg:hover:not(:disabled){background:#d4c2ff;color:#2b1840;box-shadow:none}
.live-setup .btn.primary.lg:hover:not(:disabled){background:#c7b0ff}
.live-setup .setup-link{background:#eef5ff}
.live-setup .live-tabs{background:rgba(255,255,255,.8);border-color:#eee7fb;box-shadow:none}
.live-setup .live-tabs button.on{background:#e9dcff;color:#3a0a5a}
.live-setup .lib-count{background:#f1eaff;color:#6a3fc4}
.live-setup .lib-list li:not(.lib-grade){background:#fcfaff;border-color:#efe8fb}
.live-setup .lib-list li.lib-grade{display:block;padding:14px 4px 2px;border:0;background:none;box-shadow:none;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#8a6fc4}
.live-setup .lib-list li.lib-grade:first-child{padding-top:0}

/* Whiteboard ergonomics: Undo/Redo under the tools, board pages in the bottom bar */
.ink-rail .rail-undo{padding-top:6px;border-top:1px solid var(--line)}
.ink-rail .rail-undo .rail-btn{width:30px;height:32px}
.ink-rail .rail-tools button{height:36px}
.stage-nav-btn.wide{width:auto;padding:0 18px 2px;font-size:17px;white-space:nowrap}
.stage-nav-btn.back{width:auto;padding:0 16px 2px;font-size:15px;white-space:nowrap}
.board-nav{right:190px}

/* Question slides: no box, no watermark, no label. The question alone, large, on the plain slide. */
.stage-slide .think,.stage-slide:not(.no-visual):not(.is-summary) .ss-focus .think,.stage-slide.no-visual:not(.is-summary) .ss-focus .think{background:transparent;box-shadow:none;border-radius:0;padding:0;overflow:visible}
.stage-slide .think-mark,.card-slide .think-mark{display:none}
.card-slide .think{background:transparent;padding:0}
.stage-slide.is-asking:not(.is-summary) .ss-focus{grid-column:1 / -1;flex-direction:column;flex-wrap:nowrap;justify-content:center;align-items:stretch;height:100%;padding:0 4%}
.stage-slide.is-asking:not(.is-summary) .ss-focus .think{width:100%;max-width:none;flex-direction:column;align-items:flex-start;gap:28px}
.stage-slide.is-asking:not(.is-summary) .ss-focus .think-prompt{font-size:clamp(34px,4.4vw,64px);line-height:1.2;font-weight:700;letter-spacing:-.02em;color:#1c1027;max-width:24ch}
.stage-slide .think.is-open .think-prompt{color:#1c1027}
.stage-slide .think-reveal{background:transparent;box-shadow:none;padding:4px 0 0;border-radius:0;color:#0b5e5a}
.stage-slide .think-btn,.card-slide .think-btn{min-height:30px;padding:0 14px;border-radius:99px;font-size:13px;font-weight:600;background:transparent;color:#7a6f88;box-shadow:inset 0 0 0 1px #d9d2e3}
.stage-slide .think-btn:hover{color:var(--accent);box-shadow:inset 0 0 0 1px #cdb3ef}
.ss-focus>.ss-idea.after-think{order:2}
.ss-focus>.mistake{order:3}
.stage-slide:not(.is-summary) .ss-focus .think.is-open .think-prompt{font-size:clamp(28px,3.2vw,46px);line-height:1.2;letter-spacing:-.02em}
.stage-slide:not(.is-summary) .ss-focus .think.is-open .think-reveal{font-size:clamp(18px,1.9vw,26px)}
/* Step-by-step explanation: plain lines, no boxes. The step being explained gets a soft highlight. */
.think-steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;width:100%;counter-reset:st}
.think-steps>li{counter-increment:st;position:relative;padding:8px 14px 8px 46px;border-radius:12px;color:#5c5470;font:600 clamp(18px,1.9vw,26px)/1.35 var(--font-body);transition:background .25s,color .25s;animation:reveal-in .3s ease-out}
.think-steps>li::before{content:counter(st);position:absolute;left:12px;top:50%;transform:translateY(-50%);width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font:700 13px/1 var(--font-body);color:#9a92a8;box-shadow:inset 0 0 0 1.5px #d9d2e3}
.think-steps>li.is-now{background:#fff4d6;color:#1c1027}
.think-steps>li.is-now::before{background:#e0a63a;color:#fff;box-shadow:none}
.think-steps>li:only-child{padding-left:14px}
.think-steps>li:only-child::before{display:none}
.card-slide .think-steps>li{font-size:15px;padding:4px 0 4px 34px;color:#1c1027;background:none}
.card-slide .think-steps>li::before{left:2px}
.stage-slide .think-next{align-self:flex-start;margin-left:46px}
.stage-slide.is-solving .ss-focus .think{gap:14px}
/* Watch out: a note, not a box */
.stage-slide .mistake,.card-slide .mistake,.mistake{background:transparent;box-shadow:none;border-radius:0;padding:4px 0 0 14px;border-left:3px solid #e8a3b2}
.stage-slide .mistake-label,.mistake-label{box-shadow:none;padding:0;background:none;color:var(--bad);font-weight:700}
/* Join screen: students from the other sessions */
.name-more{margin-top:14px;width:100%}
.name-more-head{margin:4px 0 10px}
/* Class codes */
.lx-codes{border-top:1px solid var(--line-2,#e2dcec);padding-top:10px}
.lx-codes>summary{cursor:pointer;font-weight:600;color:var(--accent,#7b3ff2)}
.lx-codes table{width:100%;border-collapse:collapse;margin:8px 0}
.lx-codes td{padding:5px 6px;border-bottom:1px solid #f0ecf5;vertical-align:middle;font-size:14px}
.lx-codes td:first-child{width:55%}
.lx-codes input{width:120px;padding:6px 8px;border:1px solid #d9d2e3;border-radius:8px;font:600 14px/1.2 var(--font-body);letter-spacing:.06em;text-transform:uppercase}
.lx-codes tr.cur td:first-child{font-weight:700}
.lx-codes tr.dup input{border-color:#d64545;background:#fdf0ef}
.lx-codes-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
/* Explanation rows: math on the left, stacked like board work; the thought beside it, smaller and lighter. */
.think-steps{counter-reset:none;gap:2px}
.think-steps>li.st-row{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);align-items:baseline;column-gap:28px;padding:7px 14px;border-radius:10px;color:#1c1027;font:500 clamp(17px,1.55vw,23px)/1.4 var(--font-body)}
.think-steps>li.st-row::before{display:none}
.think-steps>li.st-row .st-math{grid-column:1;min-width:0}
.think-steps>li.st-row .st-note{grid-column:2;color:#7a6f88;font:500 clamp(13px,1.05vw,16px)/1.35 var(--font-body);padding-left:14px;border-left:2px solid #ece6f3}
.think-steps>li.st-row.st-only-note .st-note{grid-column:1 / -1;border-left:0;padding-left:0;color:#5c5470;font-weight:600}
.think-steps>li.st-row.st-text .st-math{grid-column:1 / -1}
.think-steps>li.st-row.is-now{background:#fff4d6}
.think-steps>li.st-row.is-now .st-note{color:#6b4a00;border-left-color:#e0a63a}
.stage-slide .think-next{margin-left:14px}
/* The question: clear but not shouting */
.stage-slide.is-asking:not(.is-summary) .ss-focus .think-prompt{font-size:clamp(26px,2.9vw,42px)}
.stage-slide:not(.is-summary) .ss-focus .think.is-open .think-prompt{font-size:clamp(20px,2vw,28px)}
/* Student phones: the thought goes under the math */
.card-slide .think-steps>li.st-row{grid-template-columns:1fr;row-gap:2px;padding:6px 8px;font-size:15px}
.card-slide .think-steps>li.st-row .st-note{grid-column:1;padding-left:0;border-left:0;font-size:12.5px}
.card-slide .think-steps>li.st-row.is-now{background:#fff4d6}
/* Keep each thought right next to its math: one shared grid, the math column as wide as its longest line. */
.stage-slide .think-steps{display:grid;grid-template-columns:max-content minmax(0,1fr);row-gap:2px;width:auto;max-width:100%}
.stage-slide .think-steps>li.st-row{grid-column:1 / -1;grid-template-columns:subgrid;column-gap:32px}
@supports not (grid-template-columns:subgrid){.stage-slide .think-steps>li.st-row{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}}

/* Worked examples: the question steps back, the steps use the whole width, "Next time" stands out */
.stage-slide:not(.is-summary) .ss-focus .think.is-open .think-prompt{font-size:clamp(17px,1.4vw,21px);font-weight:600;line-height:1.35;max-width:none;color:#2b1840}
.stage-slide .think-steps{width:100%}
/* "Next time" and everything under it (key idea, Watch out) form one golden pastel block */
.stage-slide .think-steps>li.st-row.st-only-note{margin-top:12px;padding:16px 24px 12px 66px;border:2px solid #f3d27e;border-bottom:0;border-radius:18px 18px 0 0;background:#fff4d4;animation:takeaway-in .45s ease-out}
.stage-slide .think-steps>li.st-row.st-only-note::before{content:"\1F4A1";display:grid;place-items:center;position:absolute;left:18px;top:50%;transform:translateY(-50%);width:36px;height:36px;border-radius:50%;background:#ffe08a;font-size:19px;line-height:1;box-shadow:0 0 0 4px #fff8e3}
.stage-slide .think-steps>li.st-row.st-only-note .st-note{color:#3a0a5a;font:700 clamp(18px,1.7vw,25px)/1.35 var(--font-body)}
@keyframes takeaway-in{0%{transform:scale(.98);opacity:0}100%{transform:none;opacity:1}}
.stage-slide.is-solving:not(.is-summary):not(.x) .ss-focus:has(.st-only-note){gap:0}
.stage-slide .ss-focus:has(.st-only-note)>.ss-idea.after-think{margin:0;padding:6px 24px 12px;background:#fff4d4;border:2px solid #f3d27e;border-top:0;border-bottom:0;animation:takeaway-in .45s ease-out}
.stage-slide .ss-focus:has(.st-only-note)>.ss-idea.after-think .ss-lines li{color:#3a2a10}
.stage-slide .ss-focus:has(.st-only-note)>.mistake{margin:0;padding:10px 24px 18px;background:#fff4d4;border:2px solid #f3d27e;border-top:0;border-radius:0 0 18px 18px;animation:takeaway-in .45s ease-out}
.stage-slide .ss-focus:has(.st-only-note)>.mistake .mistake-fix,.stage-slide .ss-focus:has(.st-only-note)>.mistake .mistake-claim{padding-left:12px;border-left:3px solid #f2a7a7}
.stage-slide .ss-focus:has(.st-only-note):not(:has(>.mistake))>.ss-idea.after-think{border-bottom:2px solid #f3d27e;border-radius:0 0 18px 18px;padding-bottom:16px}
.stage-slide .ss-focus:has(.st-only-note):not(:has(>.mistake)):not(:has(>.ss-idea.after-think)) .st-only-note{border-bottom:2px solid #f3d27e;border-radius:18px;padding-bottom:16px}
.card-slide .think-steps>li.st-row.st-only-note{margin-top:6px;padding:8px 10px;border-radius:10px;background:#fff4d4;border:1.5px solid #f3d27e}
.card-slide .think-steps>li.st-row.st-only-note .st-note{color:#3a0a5a;font-weight:700;font-size:14px}
/* While the steps are showing, the picture moves beside them instead of sliding under the text */
.stage-slide.is-solving:not(.no-visual):not(.is-summary){grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);grid-template-rows:auto minmax(0,1fr);column-gap:36px}
.stage-slide.is-solving:not(.no-visual):not(.is-summary) .ss-focus{grid-column:1;grid-row:2;align-self:start}
.stage-slide.is-solving:not(.no-visual):not(.is-summary) .ss-visual{grid-column:2;grid-row:2;align-self:start;margin-top:0;min-height:0}
.stage-slide.is-solving:not(.no-visual):not(.is-summary) .ss-visual>.fig svg{max-width:100%;height:auto}
/* Question-first slides: the concept name never sits above the question (it would give the trick away).
   The question is the heading; the "Next time" bar names the idea at the end. */
.stage-slide.is-solving .ss-head{display:none}
.card-slide:has(.think) .cs-kicker,.card-slide:has(.think) .cs-title{display:none}
/* Reveal and Next step as quiet round icons; more air around the explanation */
.stage-slide .think-btn.think-ico{width:46px;height:46px;min-height:0;padding:0;border-radius:50%;display:grid;place-items:center;background:#fff;color:#7b3ff2;box-shadow:inset 0 0 0 2px #d8c6f7;transition:transform .15s,box-shadow .15s,background .15s}
.stage-slide .think-btn.think-ico:hover{background:#f6f1fd;box-shadow:inset 0 0 0 2px #7b3ff2;transform:translateY(1px)}
.stage-slide .think-btn.think-reveal-btn{background:#7b3ff2;color:#fff;box-shadow:0 8px 18px -10px rgba(58,10,90,.7)}
.stage-slide .think-btn.think-reveal-btn:hover{background:#3a0a5a;color:#fff;box-shadow:0 8px 18px -10px rgba(58,10,90,.7)}
.think-ico-svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.stage-slide .think-next.think-ico{margin:6px 0 0 14px}
.stage-slide.is-solving .ss-focus .think-prompt{margin-bottom:10px}
.stage-slide .think-steps>li.st-row{padding-top:6px;padding-bottom:6px}
.stage-slide .think-steps>li.st-row.st-only-note{margin-top:16px}
.stage-slide.is-solving:not(.no-visual):not(.is-summary) .ss-visual,.stage-slide.is-solving .ss-visual:has(.em-img){justify-content:flex-start;height:auto;align-self:start}
.stage-slide.is-solving .ss-visual .em-img.is-big{flex:none;height:auto;width:100%}
.stage-slide.is-solving .ss-visual .em-img.is-big img{width:100%;height:auto;max-height:none}
.em-svg{display:flex;justify-content:center;align-items:center;width:100%}
.em-svg svg{display:block;max-width:100%;height:auto;max-height:260px;border-radius:12px;overflow:hidden}
.em-img.em-img-small .em-svg svg{max-height:150px}.em-img.em-img-large .em-svg svg{max-height:340px}
.em-img.is-big .em-svg svg{max-height:44vh}.em-img.is-big.em-img-small .em-svg svg{max-height:26vh}.em-img.is-big.em-img-large .em-svg svg{max-height:58vh}
.ss-visual .em-svg svg,.cs-visual .em-svg svg{width:auto}
.stage-slide .ss-visual .em-img.is-big .em-svg{height:100%}
.stage-slide .ss-visual .em-img.is-big .em-svg svg{height:100%;max-height:100%;width:auto;max-width:100%}
.stage-slide.is-solving .ss-visual .em-img.is-big .em-svg svg{width:100%;height:auto;max-height:none}