.teaching-slide.slide-history-timeline{overflow:hidden;padding:8px 0;container-type:size}
.history-stage{position:relative;isolation:isolate;flex:1;min-height:0;overflow:hidden;border-radius:12px;border:1px solid #b1995f;background:radial-gradient(ellipse at 50% 30%,#46544b,#192c27 75%)}
.history-background,.history-dim{position:absolute;inset:0;pointer-events:none}
.history-background{z-index:0}.history-background video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .65s ease}
.history-background video.is-visible{opacity:1}
.history-background .history-main-video{object-fit:cover;z-index:1;background:transparent}
.history-background .history-video-blur{display:none}
.history-dim{z-index:1;background:#000;opacity:.65}
.history-content{position:relative;z-index:2;height:100%;min-height:0;display:flex;flex-direction:column;gap:3cqh;padding:4cqh 5%}
.history-heading{flex:none;text-align:center}
.teaching-slide.slide-history-timeline .history-heading p{margin:0 0 1cqh;color:#c9b98e;font:600 clamp(9px,2cqh,13px)/1.4 var(--sans);letter-spacing:2px}
.teaching-slide.slide-history-timeline .history-heading h2{margin:0;color:#ffe5ac;font:750 clamp(25px,6.4cqh,46px)/1.2 var(--serif);text-shadow:0 2px 10px #000}
.history-rail{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));flex:none;margin:1.5cqh 0 0;padding-top:1cqh}
.history-rail:before,.history-rail:after{content:"";position:absolute;left:12.5%;right:12.5%;top:calc(1cqh + 29px);height:2px;background:linear-gradient(90deg,#706956,#d3b76d,#706956);box-shadow:0 2px 7px #e8cc681a}
.history-rail:after{top:calc(1cqh + 36px)}
.history-stop{position:relative;display:flex;align-items:center;flex-direction:column;gap:1cqh;min-width:0;z-index:1}
.history-node{display:grid;place-items:center;width:66px;height:66px;flex:none;padding:0;background:#222b26;border:2px solid #81765b;border-radius:50%;color:#afa484;box-shadow:0 0 0 6px #0d1816;cursor:pointer;transition:background .25s,border-color .25s,box-shadow .25s,transform .25s}
.history-node svg{width:26px;height:26px;display:block}.history-number{display:none;font:700 24px/1 'Courier New',monospace}
.history-node.is-unlocked .history-lock{display:none}.history-node.is-unlocked .history-number{display:block}
.history-node:hover,.history-node:focus-visible{border-color:#edd48f;color:#ffe6af;outline:2px solid #cdb579;outline-offset:5px}
.history-node[aria-pressed=true]{border-color:#ffe0a1;background:#72552b;color:#fff0c4;box-shadow:0 0 0 6px #302b20,0 0 30px #eac06b88;transform:scale(1.07)}
.history-node-label{min-height:1.4em;color:#ebd8ae;text-align:center;font:600 clamp(12px,2.8cqh,19px)/1.4 var(--sans)}
.history-card-area{display:flex;align-items:flex-end;justify-content:center;flex:1;min-height:0}
.teaching-slide.slide-history-timeline .history-instruction{color:#c9c0a8;font:400 clamp(15px,3.4cqh,23px)/1.5 var(--sans);text-align:center;margin:0}
.history-card{width:100%;max-width:1150px;padding:2.8cqh 3%;border:1px solid #c4a86d99;border-left:4px solid #e0bb70;border-radius:8px;background:linear-gradient(110deg,#172620ee,#1f3028d9);box-shadow:0 8px 30px #0004}
.history-card[hidden],.history-instruction[hidden]{display:none}
.teaching-slide.slide-history-timeline .history-card h3{margin:0 0 1.5cqh;color:#ffe1a4;font:750 clamp(18px,4cqh,28px)/1.25 var(--serif)}
.teaching-slide.slide-history-timeline .history-card p{margin:0;color:#fff6df;font:500 clamp(16px,3.55cqh,25px)/1.6 var(--sans);text-align:left}
.history-card.is-revealing{animation:history-reveal .45s ease both}
.history-mute{position:absolute;right:18px;bottom:18px;z-index:3;display:grid;place-items:center;width:46px;height:46px;margin:0;padding:0;border:1px solid #ead7a988;border-radius:50%;background:#101e18c9;color:#fff0c2;cursor:pointer;backdrop-filter:blur(8px)}
.history-mute[hidden]{display:none}.history-mute:disabled{opacity:.45;cursor:wait}
.history-mute svg{display:block;width:24px;height:24px;pointer-events:none}
.history-mute:hover{background:#354335df;border-color:#fff0c2}.history-mute:focus-visible{outline:2px solid #fff0c2;outline-offset:3px}
.history-content{padding-bottom:65px}
.slide-history-timeline.history-will-selected .history-content{padding-bottom:14px}
.slide-history-timeline.history-will-selected .history-card{max-width:min(1150px,calc(100% - 70px));margin-right:70px}
@keyframes history-reveal{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:600px){.history-content{padding:3cqh 5%;gap:2cqh}.history-node{width:46px;height:46px}.history-node svg{width:21px;height:21px}.history-rail:before{top:calc(1cqh + 19px)}.history-rail:after{top:calc(1cqh + 25px)}.history-node-label{font-size:10px}.history-card{padding:2cqh 5%}.teaching-slide.slide-history-timeline .history-card p{font-size:clamp(13px,2.7cqh,17px);line-height:1.5}.teaching-slide.slide-history-timeline .history-card h3{font-size:19px}}
@media(prefers-reduced-motion:reduce){.history-card.is-revealing{animation:none}.history-node,.history-background video{transition:none}}