/* EK lecture website. Colours and type follow the PPU 05 presentation. */
:root{color-scheme:light;--purple:#5b4e8c;--purple-dark:#493c75;--ink:#16151b;--muted:#5b5864;--rule:#dcd9e5;--soft:#f3f1f7;--workspace:#eeedf1;font-family:Aptos,"Segoe UI",Arial,Helvetica,sans-serif}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--workspace);color:var(--ink);min-height:100vh;display:flex;flex-direction:column;line-height:1.45}
a{color:var(--purple);text-underline-offset:.2em}
a:focus-visible,button:focus-visible{outline:3px solid var(--purple);outline-offset:3px}
h1,h2,h3{font-family:"Aptos Display",Aptos,"Segoe UI",Arial,sans-serif;letter-spacing:-.02em;margin:0}
p{margin:0}

.site-header,main{width:100%;max-width:1200px;margin:0 auto;padding-left:40px;padding-right:40px}
.site-header{padding-top:25px;padding-bottom:20px}
.site-name{display:inline-block;font-size:18px;font-weight:600;color:var(--ink);text-decoration:none;margin-bottom:5px}
.site-name:hover{color:var(--purple)}
.site-meta{font-size:12px;color:var(--muted)}
main{flex:1;padding-bottom:56px}

.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--muted);margin:4px 0 18px}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--purple);text-decoration:underline}

.intro{background:white;position:relative;padding:44px 48px 36px;box-shadow:0 10px 40px #24183613;margin-bottom:28px;overflow:hidden}
.intro:before,.card:before,.panel:before{content:"";position:absolute;inset:0 0 auto;height:8px;background:var(--purple)}
.intro h1{font-size:clamp(28px,4vw,44px);line-height:1.1;font-weight:600;max-width:900px}
.intro p{margin-top:12px;color:var(--muted);font-size:17px;max-width:760px}
.intro .eyebrow+h1{margin-top:2px}
.eyebrow{font-size:12px;color:var(--purple);letter-spacing:.08em;text-transform:uppercase;font-weight:600;margin:0 0 8px!important}
.intro .lead{font-size:18px}

.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.card{position:relative;display:flex;flex-direction:column;gap:8px;background:white;padding:30px 28px 24px;color:var(--ink);text-decoration:none;box-shadow:0 10px 40px #24183613;transition:transform .15s,box-shadow .15s;overflow:hidden}
.card:hover{transform:translateY(-2px);box-shadow:0 14px 44px #24183622}
.card h2{font-size:24px;font-weight:600;line-height:1.15}
.card p{color:var(--muted);font-size:15px}
.card-cta{margin-top:auto;padding-top:14px;color:var(--purple);font-weight:600;font-size:14px}

.lecture-list{display:flex;flex-direction:column;background:white;box-shadow:0 10px 40px #24183613}
.lecture-row{display:grid;grid-template-columns:90px 1fr 30px;gap:18px;align-items:center;padding:20px 28px;border-top:1px solid var(--rule);color:var(--ink);text-decoration:none}
.lecture-row:first-child{border-top:0}
.lecture-row:hover{background:var(--soft)}
.lecture-row .code{font-weight:700;color:var(--purple);font-size:15px;letter-spacing:.02em}
.lecture-main{display:flex;flex-direction:column;gap:4px;min-width:0}
.lecture-main strong{font-size:18px;font-weight:600}
.lecture-main small{color:var(--muted);font-size:14px}
.badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.badges span{font-size:11px;background:var(--soft);border:1px solid var(--rule);color:var(--muted);padding:3px 8px;border-radius:999px}
.arrow{color:var(--purple);font-size:20px;text-align:right}

.lecture-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:24px;align-items:start}
.lecture-layout.no-video{grid-template-columns:1fr}
.lecture-layout.no-video .lecture-main-col{display:none}
.lecture-main-col,.lecture-side{display:flex;flex-direction:column;gap:24px;min-width:0}
.panel{position:relative;background:white;padding:28px 26px 24px;box-shadow:0 10px 40px #24183613;overflow:hidden}
.panel:before{height:5px}
.panel h2{font-size:20px;margin-bottom:12px}
.panel>p:not(.eyebrow){color:var(--muted);font-size:14px}
.video-panel{padding:24px}
video{display:block;width:100%;aspect-ratio:16/9;background:#16151b}

.buttons{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.button{display:block;text-align:center;border:1px solid #cecbd6;border-radius:5px;padding:12px 14px;font-size:14px;color:var(--ink);text-decoration:none}
.button.primary{background:var(--purple);border-color:var(--purple);color:white;font-weight:600}
.button.primary:hover{background:var(--purple-dark)}

.activities{margin:0;padding-left:22px;font-size:15px}
.activities li{padding:6px 0 6px 4px;border-bottom:1px solid var(--rule)}
.activities li:last-child{border-bottom:0}
.files,.links{list-style:none;margin:0;padding:0}
.files li+li,.links li+li{border-top:1px solid var(--rule)}
.files a{display:flex;flex-direction:column;gap:2px;padding:10px 0;text-decoration:none;color:var(--ink)}
.files a:hover .file-name{color:var(--purple);text-decoration:underline}
.file-name{font-size:14px;font-weight:600;word-break:break-word}
.file-meta{font-size:12px;color:var(--muted)}
.links a{display:block;padding:10px 0;font-size:14px;word-break:break-word}

.pager{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:28px}
.pager a{display:flex;flex-direction:column;gap:3px;background:white;padding:16px 20px;color:var(--ink);text-decoration:none;font-size:15px;font-weight:600;box-shadow:0 10px 40px #24183613}
.pager a:hover{color:var(--purple)}
.pager small{font-size:12px;color:var(--muted);font-weight:400}
.pager .next{text-align:right}
.empty{color:var(--muted);background:white;padding:28px}

.brand-footer{background:var(--purple);color:white;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 40px}
.brand-footer p{font-size:12px;line-height:1.3;font-weight:600}
.brand-footer img{height:26px;width:auto}

@media (max-width:860px){
  .lecture-layout{grid-template-columns:1fr}
}
@media (max-width:600px){
  .site-header,main{padding-left:16px;padding-right:16px}
  .intro{padding:32px 22px 26px}
  .lecture-row{grid-template-columns:1fr 20px;padding:18px 20px;gap:4px 12px}
  .lecture-row .code{grid-column:1/-1}
  .panel,.video-panel{padding:24px 18px 18px}
  .pager{grid-template-columns:1fr}
  .pager .next{text-align:left}
  .brand-footer{padding:14px 16px}
  .brand-footer img{height:20px}
}
.intro .eyebrow{color:var(--purple)}
.lecture-layout.no-video .lecture-side{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));align-items:start}

/* Lesson player: narrated slides + clips. Slide style follows the tutorial video deck. */
@font-face{font-family:"Space Grotesk";src:url(space-grotesk.woff2) format("woff2");font-weight:300 700;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(ibm-plex-sans.woff2) format("woff2");font-weight:100 700;font-display:swap}
.lp-stage{position:relative;aspect-ratio:16/9;background:#1d1761;container-type:inline-size;overflow:hidden;user-select:none;-webkit-user-select:none}
.lp-clip{position:absolute;inset:0;width:100%;height:100%;background:#000;object-fit:contain;aspect-ratio:auto}
.lp-slide{position:absolute;inset:0;padding:7cqw 8cqw;display:flex;flex-direction:column;justify-content:center;gap:2cqw;color:white;font-family:"IBM Plex Sans",Arial,sans-serif;background:radial-gradient(120% 90% at 100% 100%,#595eaf55 0,transparent 60%),#1d1761;cursor:pointer}
.lp-slide h2{font-family:"Space Grotesk",Arial,sans-serif;font-weight:700;font-size:5.4cqw;line-height:1.08;letter-spacing:-.02em;max-width:72cqw}
.lp-slide.lp-title h2{font-size:6.6cqw}
.lp-series{position:absolute;top:4.5cqw;left:8cqw;font-size:1.6cqw;letter-spacing:.06em;text-transform:uppercase;color:#c9caf0;margin:0}
.lp-chip{align-self:flex-start;background:#f3b9a3;color:#1d1761;font-family:"Space Grotesk",Arial,sans-serif;font-weight:700;font-size:1.9cqw;padding:.7cqw 1.6cqw;border-radius:99px;margin:0}
.lp-kicker{font-family:"Space Grotesk",Arial,sans-serif;font-weight:500;font-size:2.4cqw;color:#f3b9a3;margin:0 0 1cqw}
.lp-slide:before{content:"";position:absolute;left:8cqw;bottom:5cqw;width:9cqw;height:.7cqw;background:#595eaf}
.lp-slide.lp-title:before,.lp-slide.lp-end:before{background:#f3b9a3}
.lp-logo{position:absolute;right:4cqw;bottom:3.6cqw;height:3cqw;width:auto}
.lp-start{position:absolute;left:50%;bottom:12cqw;transform:translateX(-50%);z-index:3;background:#f3b9a3;color:#1d1761;border:0;border-radius:99px;padding:14px 28px;font:700 17px "Space Grotesk",Arial,sans-serif;cursor:pointer;box-shadow:0 8px 30px #0006}
.lp-start:hover{background:#fff}
.lp-seek{position:relative;height:16px;display:flex;align-items:center;cursor:pointer;touch-action:none;outline:none}
.lp-seek:hover .lp-segs,.lp-seek.is-dragging .lp-segs,.lp-seek:focus-visible .lp-segs{height:7px}
.lp-seek:focus-visible{box-shadow:0 0 0 2px #f3b9a3;border-radius:3px}
.lp-seg i{position:absolute;left:0;top:0;bottom:0}
.lp-fill{width:0;background:#f3b9a3}
.lp-seek:hover .lp-segs{background:linear-gradient(90deg,#ffffff30 var(--hover,0),transparent var(--hover,0))}
.lp-knob{position:absolute;top:50%;width:13px;height:13px;margin:-6.5px 0 0 -6.5px;border-radius:50%;background:#f3b9a3;transform:scale(0);transition:transform .1s;pointer-events:none}
.lp-seek:hover .lp-knob,.lp-seek.is-dragging .lp-knob,.lp-seek:focus-visible .lp-knob{transform:scale(1)}
.lp-tip{position:absolute;bottom:22px;transform:translateX(-50%);background:#100c3aeb;color:#fff;padding:5px 9px;border-radius:4px;font-size:12px;line-height:1.35;white-space:nowrap;text-align:center;pointer-events:none;display:flex;flex-direction:column;max-width:320px}
.lp-tip[hidden]{display:none}
.lp-tip span{overflow:hidden;text-overflow:ellipsis;font-weight:600}
.lp-tip b{font-weight:500;font-variant-numeric:tabular-nums;color:#c9caf0}
.lp-controls{display:flex;align-items:center;gap:2px;height:44px}
.lp-controls button{display:inline-flex;align-items:center;justify-content:center;background:transparent;border:0;color:#fff;min-width:40px;height:40px;padding:0 6px;border-radius:4px;cursor:pointer;opacity:.92}
.lp-controls button:hover:not(:disabled){opacity:1;background:#ffffff1a}
.lp-controls button:disabled{opacity:.35;cursor:default}
.lp-controls button:focus-visible{outline:2px solid #f3b9a3;outline-offset:-2px}
.lp-volume{display:inline-flex;align-items:center}
.lp-vol{width:0;opacity:0;transition:width .15s,opacity .15s;margin:0;height:4px;appearance:none;-webkit-appearance:none;background:linear-gradient(90deg,#fff var(--v,100%),#ffffff4d var(--v,100%));border-radius:2px;cursor:pointer}
.lp-volume:hover .lp-vol,.lp-vol:focus-visible{width:64px;opacity:1;margin:0 8px 0 2px}
.lp-vol::-webkit-slider-thumb{-webkit-appearance:none;width:12px;height:12px;border-radius:50%;background:#fff;border:0}
.lp-vol::-moz-range-thumb{width:12px;height:12px;border-radius:50%;background:#fff;border:0}
.lp-time{font-size:13px;font-variant-numeric:tabular-nums;white-space:nowrap;margin:0 8px}
.lp-chapter{flex:1;min-width:0;font-size:13px;color:#ddd;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lp-chapter:not(:empty):before{content:"·";margin-right:8px;color:#aaa}
.lp-controls .lp-rate{font:600 13px "IBM Plex Sans",Arial,sans-serif;min-width:44px}
.lp-controls .lp-cc{font:700 12px Arial,sans-serif;min-width:40px}
.lp-controls .lp-cc[aria-pressed=true]{box-shadow:inset 0 -3px 0 #f3b9a3}
.lp-flash{position:absolute;left:50%;top:50%;z-index:2;transform:translate(-50%,-50%);background:#000000a0;color:#fff;border-radius:40px;padding:12px 22px;font:600 18px "IBM Plex Sans",Arial,sans-serif;opacity:0;pointer-events:none}
.lp-flash.is-on{animation:lp-flash .7s ease-out}
@keyframes lp-flash{0%{opacity:1;transform:translate(-50%,-50%) scale(.9)}100%{opacity:0;transform:translate(-50%,-50%) scale(1.15)}}
@media (max-width:600px){.lp-start{font-size:15px;padding:10px 20px}}
.lp-transcript{font-size:16px;line-height:1.65;color:var(--ink)}
.lp-transcript [data-item]{cursor:pointer}
.lp-transcript h3{font-family:"Space Grotesk",Arial,sans-serif;font-size:22px;margin:0 0 6px}
.lp-transcript h4{font-family:"Space Grotesk",Arial,sans-serif;font-size:17px;margin:22px 0 6px;display:flex;gap:10px;align-items:baseline}
.lp-transcript h4 .lp-num{font-size:12px;letter-spacing:.06em;text-transform:uppercase;min-width:auto}
.lp-transcript p{margin:0 0 10px}
.lp-tx-end{margin-top:22px!important;color:var(--muted);font-style:italic}
.lp-transcript h3.is-current,.lp-transcript h4.is-current,.lp-transcript .lp-tx-end.is-current{color:var(--purple)}
.lp-tx-part{border-left:3px solid transparent;padding-left:12px;margin-left:-15px}
.lp-tx-part.is-current{border-left-color:var(--purple)}
.lp-transcript span:hover{background:var(--soft)}
.lp-transcript span.is-current{background:#f3b9a366;border-radius:3px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.site-line-header{padding-top:18px;padding-bottom:16px}
.site-line{font-size:15px;color:var(--muted);margin:0}
.site-line a{color:var(--muted);text-decoration:none}
.site-line a:hover{color:var(--purple);text-decoration:underline}
.site-line strong{color:var(--ink);font-weight:600}

/* ---------- Lecture page, layout A: Contents on the left, player in the middle, tabs under it. ---------- */
body.wide main{max-width:none;padding:0}
body.wide .site-header{max-width:none;padding:10px 20px;background:white;border-bottom:1px solid var(--rule)}
body.wide .site-line{display:flex;align-items:center;gap:8px}
.site-line-text{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lc-open{display:none;align-items:center;justify-content:center;flex:none;width:40px;height:40px;border:0;border-radius:6px;background:transparent;color:var(--ink);cursor:pointer}
.lc-open:hover{background:var(--soft)}
.lec-app{display:grid;grid-template-columns:340px minmax(0,1fr);align-items:start;min-height:calc(100vh - 61px)}
.lec-app.contents-closed{grid-template-columns:64px minmax(0,1fr)}
.lec-app.contents-closed .lec-contents{overflow:hidden}
.lec-app.contents-closed .lec-contents nav,.lec-app.contents-closed .lc-head-title,.lec-app.contents-closed .lc-all{display:none}
.lec-app.contents-closed .lc-head{flex-direction:column;gap:16px;padding:14px 0;border-bottom:0}
.lec-app.contents-closed .lc-pres{flex-direction:column;gap:6px;font-size:11px}
.lec-contents{position:sticky;top:0;height:100vh;overflow-y:auto;background:#100c3a;color:#fff;scrollbar-color:#ffffff40 transparent}
.lc-head{display:flex;align-items:center;justify-content:space-between;padding:14px 14px 14px 20px;border-bottom:1px solid #ffffff1f;position:sticky;top:0;background:#100c3a;z-index:1}
.lc-head-title{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:600}
.lc-head{gap:8px;padding-left:10px}
.lc-head-title{font-size:17px;font-weight:600;margin-right:auto}
.lc-toggle{display:inline-flex;align-items:center;justify-content:center;flex:none;width:40px;height:40px;border:0;border-radius:6px;background:transparent;color:#fff;cursor:pointer}
.lc-toggle:hover{background:#ffffff1a}
.lc-pres{display:inline-flex;align-items:center;gap:8px;flex:none;border:0;background:transparent;color:#fff;font:600 12px Aptos,"Segoe UI",Arial,sans-serif;padding:4px;cursor:pointer;border-radius:6px}
.lc-pres[hidden]{display:none}
.lc-pres:hover{background:#ffffff1a}
.lc-pres-track{position:relative;width:34px;height:18px;border-radius:99px;background:#ffffff40;transition:background .15s}
.lc-pres-track:after{content:"";position:absolute;left:2px;top:2px;width:14px;height:14px;border-radius:50%;background:#fff;transition:transform .15s}
.lc-pres[aria-checked=true] .lc-pres-track{background:#f0a58a}
.lc-pres[aria-checked=true] .lc-pres-track:after{transform:translateX(16px)}
.lc-sec{border-bottom:1px solid #ffffff1f}
.lc-sec-head{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:16px 16px 16px 20px;border:0;background:#1d1761;color:#fff;font:600 15px/1.3 Aptos,"Segoe UI",Arial,sans-serif;text-align:left;cursor:pointer}
.lc-sec-head:hover{background:#26206f}
.lc-sec-head svg{flex:none;transition:transform .15s}
.lc-sec-head[aria-expanded=false] svg{transform:rotate(-90deg)}
.lc-items{list-style:none;margin:0;padding:0}
.lc-item{display:flex;gap:12px;align-items:flex-start;padding:11px 16px 11px 20px;color:#fff;text-decoration:none;font-size:14px;line-height:1.35}
.lc-item:hover{background:#ffffff12}
.lc-item small{display:block;margin-top:3px;font-size:12px;color:#c9caf0}
.lc-mark{flex:none;width:14px;height:14px;margin-top:2px;border:1.5px solid #ffffffb0;border-radius:50%;position:relative}
.lc-item.is-done .lc-mark{border:0}
.lc-item.is-done .lc-mark:after{content:"";position:absolute;left:4px;top:0;width:5px;height:10px;border:solid #8fd19e;border-width:0 2px 2px 0;transform:rotate(45deg)}
.lc-doc .lc-mark{border-radius:2px;width:12px;height:15px}
.lc-item[aria-current=true]{background:#000;box-shadow:inset 4px 0 0 #f3b9a3}
.lc-item[aria-current=true]:not(.is-done) .lc-mark{background:#fff;border-color:#fff}
.lec-main{min-width:0;background:white;min-height:100%}
.lec-stage{background:#000}
.lec-stage .lp-main,.lec-videos{width:min(100%,calc((100vh - 190px)*16/9));min-width:min(100%,640px);margin:0 auto}
.lec-videos video+video{margin-top:4px}
.lec-tabs{display:flex;justify-content:center;gap:4px;border-bottom:1px solid var(--rule);background:white;overflow-x:auto;position:sticky;top:0;z-index:5}
.lec-tabs button{display:inline-flex;align-items:center;gap:9px;padding:15px 22px 13px;border:0;border-bottom:3px solid transparent;background:transparent;color:var(--muted);font:500 15px Aptos,"Segoe UI",Arial,sans-serif;cursor:pointer;white-space:nowrap}
.lec-tabs button:hover{color:var(--ink)}
.lec-tabs button[aria-selected=true]{color:var(--ink);font-weight:600;border-bottom-color:var(--ink)}
.tab-panel{padding:32px 40px 56px}
.tab-narrow{max-width:900px;margin:0 auto}
.tab-panel.tab-presentation{padding:0}
.tab-overview h2{font-size:26px;font-weight:600;line-height:1.2}
.ov-meta{color:var(--muted);font-size:14px;margin-top:6px!important}
.ov-text{margin-top:16px;font-size:16px;color:var(--ink)}
.ov-text p+p{margin-top:10px}
.tab-overview h3{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--purple);font-weight:600;margin:28px 0 8px}
.tab-overview .pager{margin-top:36px}
.tab-overview .pager a{box-shadow:none;border:1px solid var(--rule)}
.pres-frame{display:block;width:100%;height:min(1400px,180vh);border:0;background:var(--workspace)}
.pres-open{display:flex;flex-wrap:wrap;gap:20px;font-size:13px;padding:10px 20px;border-top:1px solid var(--rule)}
.lp-steps{list-style:none;margin:0;padding:0}
.lp-steps button{display:flex;gap:14px;align-items:baseline;width:100%;text-align:left;background:transparent;border:0;border-top:1px solid var(--rule);padding:13px 10px;font:inherit;font-size:15px;color:var(--ink);cursor:pointer}
.lp-steps li:first-child button{border-top:0}
.lp-steps li:empty{display:none}
.lp-steps button:hover{background:var(--soft)}
.lp-steps button[aria-current=true]{background:var(--soft);color:var(--purple);font-weight:600;box-shadow:inset 3px 0 0 var(--purple)}
.lp-steps .lp-at{margin-left:auto;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;font-weight:400}
.lp-num{flex:none;min-width:22px;font-weight:700;color:var(--purple);font-size:13px}

/* ---------- Player control bar: timeline on top, buttons below, over the bottom of the picture. ---------- */
.lp-main{position:relative;background:#000;font-family:"IBM Plex Sans",Arial,sans-serif}
.lp-main:fullscreen{display:flex;align-items:center;justify-content:center;width:100%;height:100%}
.lp-main:fullscreen .lp-stage{width:min(100vw,calc(100vh*16/9))}
.lp-main.is-idle,.lp-main.is-idle *{cursor:none!important}
.lp-chrome{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:40px 14px 4px;background:linear-gradient(transparent,#000000c8);color:#fff;transition:opacity .25s}
.lp-main.is-idle .lp-chrome{opacity:0;pointer-events:none}
.lp-segs{display:flex;gap:2px;width:100%;height:4px;transition:height .1s}
.lp-seg{position:relative;flex:1 1 0;min-width:2px;background:#ffffff38;overflow:hidden}
.lp-buf{width:0;background:#ffffff5c}
.lp-controls{display:flex;align-items:center;gap:0;height:42px}
.lp-controls button{position:relative}
.lp-controls button[data-tip]:hover:after{content:attr(data-tip);position:absolute;bottom:44px;left:50%;transform:translateX(-50%);background:#100c3aeb;color:#fff;font:500 12px "IBM Plex Sans",Arial,sans-serif;padding:4px 9px;border-radius:4px;white-space:nowrap;pointer-events:none}
.lp-controls .lp-play[data-tip]:hover:after{left:0;transform:none}
.lp-controls .lp-full[data-tip]:hover:after{left:auto;right:0;transform:none}
.lp-main.menu-open .lp-controls button:hover:after{display:none}
.lp-menu-wrap{position:relative;display:inline-flex}
.lp-controls .lp-rate{font:600 14px "IBM Plex Sans",Arial,sans-serif;min-width:44px}
.lp-menu{position:absolute;right:0;bottom:46px;background:#100c3af5;border-radius:6px;padding:6px 0;min-width:170px;box-shadow:0 6px 24px #0008;z-index:4}
.lp-menu-label{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:#c9caf0;padding:8px 14px 4px;margin:0}
.lp-controls .lp-menu button{display:flex;justify-content:flex-start;width:100%;height:32px;padding:0 14px 0 32px;border-radius:0;font:13px "IBM Plex Sans",Arial,sans-serif}
.lp-menu button[aria-checked=true]:before{content:"✓";position:absolute;left:12px}
.lp-chapter{flex:1}
.lp-main.cap-s .lp-clip::cue{font-size:clamp(12px,2cqw,22px)}
.lp-clip::cue,.lp-main.cap-m .lp-clip::cue{font-size:clamp(14px,2.6cqw,30px);background:#000000c0}
.lp-main.cap-l .lp-clip::cue{font-size:clamp(18px,3.4cqw,40px)}
.lp-upnext{position:absolute;inset:0;z-index:3;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:#100c3ae6;color:#fff;text-align:center;padding:20px}
.lp-upnext-label{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:#c9caf0}
.lp-upnext-title{font:700 clamp(18px,3cqw,30px) "Space Grotesk",Arial,sans-serif;max-width:80%}
.lp-upnext-ring{width:180px;height:4px;background:#ffffff33;border-radius:2px;overflow:hidden;display:none}
.lp-upnext.is-counting .lp-upnext-ring{display:block}
.lp-upnext-ring span{display:block;height:100%;width:0;background:#f3b9a3}
.lp-upnext.is-counting:not([hidden]) .lp-upnext-ring span{animation:lp-count 6s linear forwards}
@keyframes lp-count{to{width:100%}}
.lp-upnext-buttons{display:flex;gap:10px;margin-top:6px}
.lp-upnext button{border:0;border-radius:99px;padding:10px 22px;font:600 15px "IBM Plex Sans",Arial,sans-serif;cursor:pointer}
.lp-upnext-play{background:#f3b9a3;color:#1d1761}
.lp-upnext-cancel{background:#ffffff26;color:#fff}

/* Keep the slide's accent bar and logo clear of the control bar. */
.lp-slide:before{bottom:calc(3cqw + 56px)}
.lp-logo{bottom:calc(2cqw + 56px)}
.lp-start{bottom:calc(8cqw + 56px)}

@media (max-width:900px){
  .lc-open{display:inline-flex}
  body.wide .site-header{padding-left:8px}
  .lec-app,.lec-app.contents-closed{grid-template-columns:minmax(0,1fr)}
  .lec-app.contents-closed .lec-contents nav,.lec-app.contents-closed .lc-head-title,.lec-app.contents-closed .lc-all{display:revert}
  .lec-contents,.lec-app.contents-closed .lec-contents{display:block;position:fixed;left:0;top:0;bottom:0;width:min(340px,88vw);z-index:60;transform:translateX(-105%);transition:transform .2s}
  .lec-app.contents-open .lec-contents{transform:none;box-shadow:0 0 40px #0008}
  .lec-app.contents-open:after{content:"";position:fixed;inset:0;background:#0006;z-index:55}
  .lec-tabs{justify-content:flex-start}
  .lec-tabs button{padding:13px 14px 11px;font-size:14px}
  .tab-panel{padding:24px 18px 40px}
}
@media (max-width:600px){
  .lec-tabs button svg{display:none}
  .lp-controls button{min-width:36px;padding:0 4px}
  .lp-time{font-size:12px;margin:0 4px}
}

/* ---------- Narrated presentation in the player window ---------- */
.lp-deck{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000;display:block}
.lp-deck[hidden]{display:none}
.lp-main.is-idle .lp-deck{cursor:none}

/* ---------- Pane: sections > slides / video lessons > steps ---------- */
.lc-all{flex:none;background:transparent;border:1px solid #ffffff55;border-radius:99px;color:#fff;font:600 12px Aptos,"Segoe UI",Arial,sans-serif;padding:6px 12px;cursor:pointer}
.lc-all:hover{background:#ffffff1a}
.lc-sec-head small{display:block;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#f3b9a3;margin-bottom:2px}
.lc-other .lc-sec-head small{color:#c9caf0}
.lc-line{display:flex;align-items:stretch}
.lc-line .lc-item{flex:1;min-width:0}
.lc-exp{flex:none;width:40px;border:0;background:transparent;color:#c9caf0;cursor:pointer}
.lc-exp:hover{background:#ffffff12;color:#fff}
.lc-exp svg{transition:transform .15s}
.lc-exp[aria-expanded=false] svg{transform:rotate(-90deg)}
.lc-video .lc-mark{border-radius:3px}
.lc-steps{list-style:none;margin:0;padding:0 0 6px;background:#0b0828}
.lc-step{display:flex;gap:10px;align-items:baseline;padding:7px 16px 7px 46px;color:#dcdcf5;text-decoration:none;font-size:13px;line-height:1.35}
.lc-step:hover{background:#ffffff12;color:#fff}
.lc-step small{margin-left:auto;color:#9b9cc8;font-variant-numeric:tabular-nums}
.lc-n{flex:none;min-width:14px;color:#f3b9a3;font-weight:700}
.lc-step[aria-current=true]{color:#fff;background:#ffffff14;box-shadow:inset 3px 0 0 #f3b9a3}

/* ---------- Overview: learning goals and deliverables ---------- */
.ov-goals{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.ov-goals>div{background:var(--soft);border-radius:8px;padding:16px 18px}
.ov-goals h4{font-size:15px;margin:0 0 8px}
.ov-goals ul{margin:0;padding-left:18px;font-size:14px}
.ov-goals li+li{margin-top:4px}
.ov-deliv{border:1px solid var(--rule);border-radius:8px;padding:16px 18px;margin-top:12px}
.ov-deliv.is-done{border-color:#8fd19e;background:#f3fbf5}
.ov-deliv-head{display:flex;align-items:baseline;gap:12px}
.ov-deliv-head h4{font-size:17px;margin:0}
.ov-count{margin-left:auto;font-size:13px;color:var(--muted);white-space:nowrap}
.ov-deliv>p{margin-top:6px!important;color:var(--muted);font-size:14px}
.ov-sub{font-size:12px!important;letter-spacing:.06em;text-transform:uppercase;color:var(--purple)!important;font-weight:600;margin-top:12px!important}
.ov-checks{list-style:none;margin:6px 0 0;padding:0}
.ov-checks label{display:flex;gap:10px;align-items:flex-start;padding:7px 0;border-top:1px solid var(--rule);cursor:pointer;font-size:15px}
.ov-checks li:first-child label{border-top:0}
.ov-checks input{width:18px;height:18px;margin-top:2px;accent-color:var(--purple);flex:none}
.ov-checks input:checked+span{color:var(--muted);text-decoration:line-through}
.lp-tx-step{color:var(--purple)}
.lp-stage:has(.lp-deck) .lp-start{left:auto;right:7cqw;bottom:auto;top:50%;transform:translateY(-50%)}
@media (max-width:600px){.lp-stage:has(.lp-deck) .lp-start{top:auto;bottom:7cqw;transform:none}}
.lp-main.menu-open .lp-chrome{z-index:5}
.lp-menu{max-height:min(420px,70vh);overflow-y:auto}

/* Presenter mode key list (? or H) */
.lp-help{position:absolute;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;background:#0009}
.lp-help[hidden]{display:none}
.lp-help-box{background:#100c3a;color:#fff;border-radius:10px;padding:22px 28px;min-width:min(420px,90%);box-shadow:0 10px 40px #0008}
.lp-help-box h3{margin:0 0 12px;font-size:18px}
.lp-help-box dl{display:grid;grid-template-columns:auto 1fr;gap:6px 20px;margin:0;font-size:14px}
.lp-help-box dt{font-weight:600;color:#f0a58a}
.lp-help-box dd{margin:0}

/* ---------- Light contents pane (2026-11-13): white with a hairline; navy only for what is playing. ---------- */
.lec-contents{background:#fff;color:var(--ink);border-right:1px solid #e3e5ec;scrollbar-color:#c9ccd6 transparent}
.lc-head{background:#fff;border-bottom:1px solid #e3e5ec}
.lc-toggle{color:var(--ink)}.lc-toggle:hover,.lc-pres:hover{background:#f1f2f6}
.lc-pres{color:var(--ink)}
.lc-pres-track{background:#c9ccd6}
.lc-pres[aria-checked=true] .lc-pres-track{background:#1d1761}
.lc-all{border-color:#c9ccd6;color:var(--ink);font-weight:500}.lc-all:hover{background:#f1f2f6}
.lc-prog{padding:12px 18px 14px;border-bottom:1px solid #e3e5ec;font-size:12.5px;color:#6b7080}
.lc-prog i{display:block;height:4px;margin-top:7px;border-radius:2px;background:#e3e5ec;overflow:hidden}
.lc-prog b{display:block;height:100%;width:0;background:#2f9e64;border-radius:2px;transition:width .3s}
.lc-sec{border-bottom:1px solid #e3e5ec}
.lc-sec-head{background:transparent;color:var(--ink);padding:14px 14px 12px 18px;font-weight:600}
.lc-sec-head:hover{background:#f6f7f9}
.lc-sec-head>span{flex:1;min-width:0}
.lc-sec-head small,.lc-other .lc-sec-head small{color:#6b7080;font-size:11px;letter-spacing:.06em}
.lc-sec-head svg{color:#8a8f9e}
.lc-count{flex:none;font-style:normal;font-weight:400;font-size:12.5px;color:#8a8f9e}
.lc-count.is-full{color:#2f9e64}.lc-count.is-full:after{content:" ✓"}
.lc-sec-head[aria-expanded=true] .lc-count{display:none}
.lc-items{padding-bottom:6px}
.lc-item{color:var(--ink);padding:9px 14px 9px 18px;border-left:4px solid transparent}
.lc-item:hover{background:#f6f7f9}
.lc-item small{color:#6b7080}
.lc-mark{border-color:#b5b9c6}
.lc-item.is-done .lc-mark:after{border-color:#2f9e64}
.lc-item[aria-current=true]{background:#eceefb;box-shadow:none;border-left-color:#1d1761;font-weight:600}
.lc-item[aria-current=true] small{color:#1d1761;font-weight:400}
.lc-item[aria-current=true] .lc-mark,.lc-item[aria-current=true]:not(.is-done) .lc-mark{border:0;background:linear-gradient(#1d1761,#1d1761) center bottom/3px 14px no-repeat;display:flex;align-items:flex-end;justify-content:space-between;height:14px}
.lc-item[aria-current=true] .lc-mark:before,.lc-item[aria-current=true] .lc-mark:after{content:"";position:static;width:3px;height:9px;border:0;transform:none;background:#1d1761;border-radius:1px}
.lc-item[aria-current=true] .lc-mark{background:linear-gradient(#1d1761,#1d1761) center bottom/3px 14px no-repeat}
.lc-here.is-playing .lc-item[aria-current=true] .lc-mark:before{animation:lc-eq .9s ease-in-out infinite}
.lc-here.is-playing .lc-item[aria-current=true] .lc-mark{animation:lc-eq-mid .9s ease-in-out infinite .3s}
.lc-here.is-playing .lc-item[aria-current=true] .lc-mark:after{animation:lc-eq .9s ease-in-out infinite .6s}
@keyframes lc-eq{0%,100%{height:4px}50%{height:13px}}
@keyframes lc-eq-mid{0%,100%{background-size:3px 13px}50%{background-size:3px 4px}}
@media (prefers-reduced-motion:reduce){.lc-here.is-playing .lc-item[aria-current=true] .lc-mark,.lc-here.is-playing .lc-item[aria-current=true] .lc-mark:before,.lc-here.is-playing .lc-item[aria-current=true] .lc-mark:after{animation:none}}
.lc-exp{color:#8a8f9e}.lc-exp:hover{background:#f6f7f9;color:var(--ink)}
.lc-steps{background:#f8f9fb}
.lc-step{color:#3b3f4c}.lc-step:hover{background:#eef0f4;color:var(--ink)}
.lc-step small{color:#8a8f9e}
.lc-n{color:#1d1761}
.lc-step[aria-current=true]{color:#1d1761;background:#eceefb;box-shadow:inset 3px 0 0 #1d1761;font-weight:600}
@media (max-width:900px){.lec-app.contents-open .lec-contents{box-shadow:0 0 40px #0004}}

/* "Now playing" above the player, on a white page; the player sits in it with a small margin. */
.lec-stage{background:#fff;padding:0 24px 16px}
.lp-now{display:flex;align-items:baseline;gap:10px;min-height:44px;padding:11px 0 9px;font-size:15px;color:#6b7080;white-space:nowrap;overflow:hidden}
.lp-now[hidden]{display:flex;visibility:hidden}
.lp-now strong{color:var(--ink);font-weight:600;overflow:hidden;text-overflow:ellipsis}
.lp-now-tag{flex:none;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#1d1761;background:#eceefb;padding:3px 8px;border-radius:4px}
.lp-now-where{overflow:hidden;text-overflow:ellipsis}
.lp-now-where:before{content:"·";margin-right:8px}
.lec-stage .lp-main{border-radius:6px;overflow:hidden}
.lec-stage .lp-main:fullscreen{border-radius:0}
@media (max-width:600px){.lec-stage{padding:0 0 8px}.lp-now{padding:8px 12px}.lec-stage .lp-main{border-radius:0}}

/* Invisible strip at the bottom of the picture: the mouse there (even over the slides) brings back the control bar. */
.lp-hot{position:absolute;left:0;right:0;bottom:0;height:110px;z-index:1}
.lp-main:not(.is-playing) .lp-hot{pointer-events:none}
@media (max-width:600px){.lp-hot{display:none}}

.lec-stage .lp-main{width:min(100%,calc((100vh - 240px)*16/9))}

/* Contents pane as tall as the video, scrolling inside (2026-11-13). */
@media (min-width:901px){.lec-app.has-stage .lec-contents{height:var(--stage-h,100vh);min-height:420px}}

/* The ▶ next to every title: plays it in the main player. */
.lp-tx-play{flex:none;display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;padding:0;border:1px solid #c9ccd6;border-radius:50%;background:#fff;color:#1d1761;cursor:pointer;vertical-align:middle}
.lp-tx-play:hover{background:#1d1761;border-color:#1d1761;color:#fff}
.lp-tx-play.is-video{background:#1d1761;border-color:#1d1761;color:#fff}
.lp-tx-play.is-video:hover{background:#2c2590}
.lp-transcript h3,.lp-transcript h4{align-items:center}
.lp-transcript h3 .lp-tx-play,.lp-transcript h4 .lp-tx-play{margin-right:10px}
.lp-transcript h3,.lp-transcript h4{scroll-margin-top:calc(var(--tabs-h,52px) + 64px)}
.lp-transcript h3{display:flex}
.lec-app{background:#fff}
@media (min-width:901px){.lec-app .lec-contents{border-right:0;border-bottom:1px solid #e3e5ec}.lec-main{border-left:1px solid #e3e5ec;margin-left:-1px}}

/* ---------- Version 2 (2026-11-13): language switch, start countdown ---------- */
.site-header{position:relative}
.lang-switch{display:inline-flex;align-items:center;gap:2px;border:1px solid #c9ccd6;border-radius:99px;padding:2px;font:600 12px Aptos,"Segoe UI",Arial,sans-serif;background:#fff}
.lang-switch>*{padding:4px 10px;border-radius:99px;text-decoration:none;color:var(--ink)}
.lang-switch .lang-on{background:#1d1761;color:#fff}
.lang-switch a:hover{background:#f1f2f6}
.site-header>.lang-switch{position:absolute;right:20px;top:50%;transform:translateY(-50%)}
body.wide .site-header{display:flex;align-items:center;gap:16px}
body.wide .site-header .site-line{flex:1;min-width:0}
body.wide .site-header>.lang-switch{position:static;transform:none;flex:none}
.lc-countdown{flex:none;display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border:0;border-radius:6px;background:transparent;color:var(--ink);cursor:pointer}
.lc-countdown:hover{background:#f1f2f6}
.lc-countdown[hidden]{display:none}
.lec-app.contents-closed .lc-countdown{display:none}
.lp-countdown{position:absolute;inset:0;z-index:30;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2.2cqh;container-type:size;
  background:radial-gradient(120% 90% at 100% 100%,#595eaf55 0,transparent 60%),#1d1761;color:#fff;font-family:"Space Grotesk",Aptos,"Segoe UI",Arial,sans-serif;cursor:pointer;user-select:none}
.lp-countdown[hidden]{display:none}
.lp-countdown .cd-logo{position:absolute;left:5cqw;bottom:6cqh;height:6cqh;filter:brightness(0) invert(1);opacity:.9}
.lp-countdown .cd-label{margin:0;font-size:5.2cqh;font-weight:600;letter-spacing:.01em}
.lp-countdown .cd-label span{color:#c9caf0;font-weight:400}
.lp-countdown .cd-ring{position:relative;width:38cqh;height:38cqh}
.lp-countdown svg{width:100%;height:100%;transform:rotate(-90deg)}
.lp-countdown circle{fill:none;stroke-width:7}
.lp-countdown .cd-track{stroke:#ffffff22}
.lp-countdown .cd-arc{stroke:#f3b9a3;stroke-linecap:round;stroke-dasharray:565.5;stroke-dashoffset:0}
.lp-countdown .cd-num{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:17cqh;font-weight:700;font-variant-numeric:tabular-nums;line-height:1}
.lp-countdown.cd-last .cd-num{color:#f3b9a3}
.lp-countdown.cd-done .cd-ring{animation:cd-pop .6s ease-out}
@keyframes cd-pop{0%{transform:scale(1)}40%{transform:scale(1.08)}100%{transform:scale(1)}}
.lp-countdown .cd-say{margin:0;max-width:70cqw;min-height:4cqh;font:400 3.4cqh/1.35 "IBM Plex Sans",Aptos,"Segoe UI",Arial,sans-serif;color:#e6e6f6;text-align:center}
.lp-countdown .cd-hint{margin:0;font:400 2.4cqh "IBM Plex Sans",Aptos,"Segoe UI",Arial,sans-serif;color:#c9caf0}
.lp-countdown .cd-hint kbd{font:600 2.2cqh "IBM Plex Sans",Arial,sans-serif;border:1px solid #c9caf0;border-radius:6px;padding:.2em .6em;margin-right:.4em}
.lp-countdown.cd-run .cd-hint{visibility:hidden}
.lc-head:has(.lc-pres[aria-checked=true]) .lc-all{display:none}
.lp-countdown .cd-play{width:7cqh;height:7cqh;border-radius:50%;border:2px solid #f3b9a3;background:#ffffff14;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0}
.lp-countdown .cd-play svg{width:55%;height:55%;fill:#fff}
.lp-countdown .cd-play:hover{background:#f3b9a333}
.lp-countdown.cd-paused .cd-num{opacity:.55}
.lp-countdown.cd-run .cd-hint{visibility:visible}


/* Transcript Contents (v2, 13 Nov): a sticky bar under the tabs; it drops down one numbered list in playing order. */
.lp-toc{position:sticky;top:var(--tabs-h,52px);z-index:6;margin:-24px 0 28px;background:#fff}
.lp-toc-bar{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:10px 14px 10px 16px;border:1px solid #e3e5ec;border-radius:10px;background:#fff;cursor:pointer;font:500 14.5px "IBM Plex Sans",Arial,sans-serif;color:var(--ink);text-align:left;box-shadow:0 1px 2px #1d176114;transition:background .15s,box-shadow .15s}
.lp-toc-bar:hover{background:#f7f8fb}
.lp-toc-bar:focus-visible{outline:2px solid #1d1761;outline-offset:2px}
.lp-toc-bar[aria-expanded=true]{border-radius:10px 10px 0 0;box-shadow:0 10px 28px -12px #1d176140}
.lp-toc-label{flex:none;font:600 11.5px "IBM Plex Sans",Arial,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:#6b7080}
.lp-toc-now{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.lp-toc-count{flex:none;font-size:12px;font-weight:500;color:#6b7080;white-space:nowrap}
.lp-toc-bar svg{flex:none;color:#6b7080;transition:transform .2s}
.lp-toc-bar[aria-expanded=true] svg{transform:rotate(180deg)}
.lp-toc-list{position:absolute;left:0;right:0;top:100%;max-height:min(var(--toc-max,70vh),640px);overflow-y:auto;overscroll-behavior:contain;background:#fff;border:1px solid #e3e5ec;border-top:0;border-radius:0 0 10px 10px;box-shadow:0 18px 36px -14px #1d176147;scrollbar-width:thin;scrollbar-color:#c9ccd6 transparent}
.lp-toc-list[hidden]{display:none}
.lp-toc::before{content:"";position:absolute;z-index:-1;left:-24px;right:-24px;top:0;bottom:-6px;background:#fff}
.lp-toc-list ol{list-style:none;margin:0;padding:0}
.lp-toc-list>ol{padding-bottom:6px}
.lp-toc-head{position:sticky;top:0;z-index:1;display:block;padding:12px 18px 8px;background:#fff;border-bottom:1px solid #eef0f4;text-decoration:none;color:var(--ink)}
.lp-toc-head small{display:block;margin-bottom:1px;font:600 11px "IBM Plex Sans",Arial,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:#8a8f9e}
.lp-toc-head span{display:block;font:600 15px/1.3 "IBM Plex Sans",Arial,sans-serif}
.lp-toc-head:hover span,.lp-toc-head.is-current span{color:#1d1761}
.lp-toc-row{display:grid;grid-template-columns:24px 24px minmax(0,1fr) auto auto;align-items:center;column-gap:12px;padding:8px 18px 8px 13px;border-left:3px solid transparent;cursor:pointer}
.lp-toc-row:hover{background:#f6f7fb}
.lp-toc-row:has(.is-current){background:#eef0fb;border-left-color:#1d1761}
.lp-toc-n{font-size:12.5px;color:#8a8f9e;text-align:right;font-variant-numeric:tabular-nums}
.lp-toc-go{font-size:14.5px;line-height:1.35;color:var(--ink);text-decoration:none}
.lp-toc-go:hover{color:#1d1761}
.lp-toc-go.is-current{font-weight:600;color:#1d1761}
.lp-toc-vid{font-size:11px;font-weight:600;letter-spacing:.02em;color:#1d1761;background:#eceefb;border-radius:4px;padding:2px 6px}
.lp-toc-len{font-size:12.5px;color:#8a8f9e;font-variant-numeric:tabular-nums;min-width:34px;text-align:right}
.lp-toc-row:not(.is-video) .lp-toc-len{grid-column:5}
.lp-toc-row .lp-tx-play{margin:0}
.lp-transcript .lp-toc span:hover{background:none}
@media (max-width:700px){
  .lp-toc{margin:-16px 0 22px}
  .lp-toc-bar{gap:8px;padding:10px 12px}
  .lp-toc-count{display:none}
  .lp-toc-row{grid-template-columns:20px 24px minmax(0,1fr) auto;column-gap:10px;padding:9px 12px 9px 9px}
  .lp-toc-len{display:none}
  .lp-toc-head{padding:10px 12px 6px}
}

/* Captions never sit on the seek bar: while the control bar is visible they move up above it (Chrome/Edge). */
.lp-clip::-webkit-media-text-track-container{transition:transform .2s}
.lp-main:not(.is-idle) .lp-clip::-webkit-media-text-track-container{transform:translateY(-64px)}
.lp-main.is-full:not(.is-idle) .lp-clip::-webkit-media-text-track-container{transform:translateY(-84px)}

/* Countdown as the first slide (13 Nov): the player's control bar sits on top of it. */
.lp-main.cd-on .lp-chrome{z-index:31}
.lp-main.cd-on .lp-seek{visibility:hidden}
.lp-main.cd-on :is(.lp-back,.lp-fwd,.lp-prev,.lp-rate,.lp-cc){display:none}
.lp-main.cd-on .lp-countdown .cd-play{display:none}

/* ==========================================================================================
   Phones and tablets (2026-11-13), after YouTube and LinkedIn Learning on a phone.
   Desktop is untouched: everything below is either inside the phone media query or keyed to
   .lp-touch / .is-pseudo-full, which the player sets only on touch screens and narrow windows.
   ========================================================================================== */

/* Touch controls: a tap layer over the picture, big Previous / Play / Next in the middle, a slim bar at the bottom. */
.lp-tap,.lp-center{display:none}
.lp-main.lp-touch .lp-tap{display:block;position:absolute;inset:0;z-index:1;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.lp-main.lp-touch .lp-hot,.lp-main.lp-touch .lp-start{display:none}
.lp-main.lp-touch .lp-center{display:flex;position:absolute;inset:0;z-index:2;align-items:center;justify-content:center;gap:clamp(28px,11cqw,96px);pointer-events:none;transition:opacity .2s,background .2s}
.lp-main.lp-touch.has-started .lp-center{background:#00000052}
.lp-main.lp-touch.is-idle .lp-center{opacity:0}
.lp-main.lp-touch.is-idle .lp-center button{pointer-events:none}
.lp-center button{pointer-events:auto;display:flex;align-items:center;justify-content:center;width:48px;height:48px;padding:0;border:0;border-radius:50%;background:#0000004d;color:#fff;cursor:pointer;-webkit-tap-highlight-color:transparent}
.lp-center button svg{width:30px;height:30px}
.lp-center .lp-c-play{width:68px;height:68px;background:#00000066}
.lp-center .lp-c-play svg{width:42px;height:42px}
.lp-center button:disabled{opacity:.35}
.lp-main.lp-touch:not(.has-started) .lp-center :is(.lp-c-prev,.lp-c-next){visibility:hidden}
.lp-main.lp-touch:not(.has-started) .lp-c-play{background:#f3b9a3;color:#1d1761;box-shadow:0 8px 30px #0006}
.lp-main.cd-on .lp-center{display:none}
.lp-main.lp-touch .lp-chrome{position:absolute;left:0;right:0;bottom:0;display:flex;flex-direction:column-reverse;padding:28px 6px 0;background:linear-gradient(transparent,#000000b8);opacity:1;pointer-events:auto}
.lp-main.lp-touch.is-idle .lp-chrome{opacity:0;pointer-events:none}
.lp-main.lp-touch.is-idle,.lp-main.lp-touch.is-idle *{cursor:auto!important}
.lp-main.lp-touch .lp-controls{height:38px;gap:0}
.lp-main.lp-touch .lp-controls :is(.lp-play,.lp-back,.lp-fwd,.lp-prev,.lp-next,.lp-volume){display:none}
.lp-main.lp-touch .lp-controls button{min-width:42px;height:38px;padding:0 6px}
.lp-main.lp-touch .lp-time{font-size:12.5px;margin:0 6px}
.lp-main.lp-touch .lp-chapter{visibility:hidden}
.lp-main.lp-touch .lp-seek{height:22px;margin:0 6px}
.lp-main.lp-touch .lp-knob{transform:scale(1)}
.lp-main.lp-touch .lp-tip{bottom:26px}
.lp-main.lp-touch .lp-flash{z-index:3}
/* Speed and settings open as a sheet from the bottom of the screen. */
.lp-main.lp-touch .lp-menu{position:fixed;left:8px;right:8px;bottom:8px;top:auto;max-height:60vh;min-width:0;border-radius:14px;padding:8px 0 10px;z-index:1100;background:#100c3af7;box-shadow:0 0 0 100vmax #0000008c}
.lp-main.lp-touch .lp-controls .lp-menu button{height:44px;font-size:15px;padding-left:40px}
.lp-main.lp-touch .lp-menu button[aria-checked=true]:before{left:16px}
.lp-main.lp-touch .lp-menu-label{font-size:12px;padding:10px 16px 4px}
.lp-main.lp-touch .lp-upnext{gap:6px;padding:10px}
.lp-main.lp-touch .lp-upnext-title{font-size:15px}
/* Captions lift above the bar while it shows. */
.lp-main.lp-touch:not(.is-idle) .lp-clip::-webkit-media-text-track-container{transform:translateY(-58px)}

/* Full screen without the browser's help (iPhone): the player fills the window. */
html.lp-pseudo-full,html.lp-pseudo-full body{overflow:hidden;overscroll-behavior:none}
html.lp-pseudo-full .lec-stage{z-index:1000}
.lp-main.is-pseudo-full,.lec-stage .lp-main.is-pseudo-full{position:fixed;inset:0;z-index:1000;width:auto;min-width:0;height:100%;margin:0;border-radius:0;display:flex;align-items:center;justify-content:center;background:#000;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
.lp-main.is-pseudo-full .lp-stage{width:min(100%,calc(100vh*16/9));width:min(100%,calc(100dvh*16/9))}
.lp-main:fullscreen .lp-chrome,.lp-main.is-pseudo-full .lp-chrome{padding-left:max(10px,env(safe-area-inset-left));padding-right:max(10px,env(safe-area-inset-right));padding-bottom:max(4px,env(safe-area-inset-bottom))}
.lp-main:-webkit-full-screen{display:flex;align-items:center;justify-content:center;width:100%;height:100%}
.lp-main:-webkit-full-screen .lp-stage{width:min(100vw,calc(100vh*16/9))}

/* Contents tab: only on phones. */
.lec-tabs .tab-contents{display:none}

@media (max-width:900px),(hover:none) and (pointer:coarse) and (max-height:540px){
  body.wide .site-header{padding:8px 12px;gap:10px}
  .lc-open{display:none!important}
  .site-line-text{font-size:13.5px}
  /* One column: player (stays at the top), what is playing, tabs (stay under the player), then the open tab. */
  .lec-app,.lec-app.contents-closed,.lec-app.contents-open{display:flex;flex-direction:column;align-items:stretch;min-height:0}
  .lec-app.contents-open:after{display:none}
  .lec-main{display:contents}
  .lec-stage{order:1;position:sticky;top:0;z-index:40;display:flex;flex-direction:column;padding:0;background:#fff}
  .lec-stage .lp-main,.lec-stage .lp-main.lp-touch{width:100%;min-width:0;border-radius:0}
  .lp-now,.lp-now[hidden]{order:2;display:flex;min-height:0;padding:7px 14px;font-size:13px;gap:8px;border-bottom:1px solid #eceef3}
  .lp-now[hidden]{display:none}
  .lp-now-tag{font-size:10px;padding:2px 6px}
  .lp-now-where{display:none}
  .lec-tabs{order:2;position:sticky;top:var(--stage-h,0);z-index:30;justify-content:flex-start;gap:0;padding:0 4px;scrollbar-width:none}
  .lec-tabs::-webkit-scrollbar{display:none}
  .lec-tabs button,.lec-tabs .tab-contents{display:inline-flex;flex:1 0 auto;justify-content:center;padding:13px 12px 11px;min-height:48px;font-size:14.5px}
  .lec-tabs button svg{display:none}
  .tab-panel{order:3;padding:20px 16px 40px}
  .lec-app .lec-contents,.lec-app.has-stage .lec-contents,.lec-app.contents-closed .lec-contents,.lec-app.contents-open .lec-contents{order:3;display:none;position:static;transform:none;transition:none;width:auto;height:auto;min-height:0;overflow:visible;box-shadow:none;border:0;z-index:auto}
  /* The list itself: full width, big rows to tap. Progress and "Expand all" share the first line. */
  .lec-app.show-contents .lec-contents{display:flex;flex-wrap:wrap;align-items:center}
  .lec-app .lec-contents nav,.lec-app.contents-closed .lec-contents nav,.lec-app.contents-open .lec-contents nav{display:contents}
  .lec-contents nav>*{order:2;flex:1 0 100%;min-width:0}
  .lec-contents nav>.lc-prog{order:0;flex:1 1 0;padding:12px 16px;border:0}
  .lec-app .lc-head,.lec-app.contents-closed .lc-head{order:1;flex:none;position:static;flex-direction:row;padding:8px 12px;border:0;background:transparent}
  .lec-app .lc-all,.lec-app.contents-closed .lc-all{display:revert}
  .lc-toggle,.lc-pres,.lc-countdown,.lec-app .lc-head-title{display:none!important}
  .lec-contents nav>.lc-here{border-top:1px solid #e3e5ec}
  .lc-sec-head{min-height:56px;padding:12px 14px 12px 16px;font-size:15.5px}
  .lc-item{min-height:52px;align-items:center;padding:10px 14px 10px 16px;font-size:15px}
  .lc-item .lc-mark{margin-top:0}
  .lc-step{padding:12px 16px 12px 46px;font-size:14px}
  .lc-exp{width:48px}
  .lc-all{padding:8px 14px;font-size:13px}
  /* Transcript contents sits under the sticky tabs. */
  .lp-toc{top:calc(var(--stage-h,0px) + var(--tabs-h,48px))}
  .lp-transcript h3,.lp-transcript h4{scroll-margin-top:calc(var(--stage-h,0px) + var(--tabs-h,48px) + 64px)}
  .files a{min-height:56px}
  .brand-footer{padding:14px 16px}
}
/* A phone on its side without full screen: the player does not stay on top (it would fill the screen). */
@media (hover:none) and (pointer:coarse) and (orientation:landscape) and (max-height:540px){
  .lec-stage{position:relative}
  .lec-tabs{top:0}
  .lec-stage .lp-main{width:min(100%,calc(100vh*16/9));margin:0 auto}
}
/* Full screen with the phone upright: the bar sits on the bottom edge of the picture, not of the screen. */
.lp-main.lp-touch.is-pseudo-full .lp-chrome,.lp-main.lp-touch:fullscreen .lp-chrome{bottom:max(0px,calc(50% - 28.125vw))}