:root{color-scheme:light;--navy:#2b4676;--blue:#82bfea;--ink:#203858;--muted:#66778d;--line:#dce6ef;--pale:#f4f8fb}
*{box-sizing:border-box}
body{margin:0;color:var(--ink);background:#fff;font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased}
button,input{font:inherit}
[hidden]{display:none!important}
a{color:var(--navy)}
.masthead{max-width:1280px;padding:20px 36px 16px;margin:auto;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}
.brand{display:block;width:194px;height:88px;overflow:hidden}
.brand img{width:100%;height:100%;object-fit:contain}
.library-link{font-size:13px;font-weight:700;text-decoration:none;padding:12px 0}
.library-link span{margin-left:8px}
main{max-width:1208px;margin:36px auto 44px;padding:0 36px;min-height:58vh}
.eyebrow{font-size:11px;font-weight:700;letter-spacing:1.6px;margin:0;color:var(--navy)}
h1{font-size:clamp(27px,3.4vw,42px);line-height:1.15;letter-spacing:-1.2px;font-weight:700;margin:14px 0 24px;max-width:1050px}
.intro{max-width:590px;font-size:16px;line-height:1.6;color:var(--muted);margin-bottom:28px}
.heading-row{display:flex;gap:16px;justify-content:space-between;align-items:center}
.silent{font-size:11px;color:var(--muted);white-space:nowrap}
.silent span{font-size:15px;margin-right:4px}
.cue{margin:-8px 0 20px;line-height:1.5;font-size:15px;color:var(--muted)}
.view-note{margin:-4px 0 14px;font-size:13px;line-height:1.5;color:var(--muted)}
.player{width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:stretch}
.view-panel{margin:0;min-width:0;overflow:hidden;border:1px solid var(--line);border-radius:8px;background:var(--pale)}
.view-label{padding:12px 15px;background:#fff;border-bottom:1px solid var(--line);color:var(--navy);font-size:12px;font-weight:700;line-height:1.3}
.view-viewport{position:relative;width:100%;aspect-ratio:4/3;min-width:0;overflow:hidden;background:#fff}
.view-viewport video,.view-viewport img,.view-viewport iframe{display:block;width:100%;height:100%;object-fit:contain;border:0}
.view-status{position:absolute;inset:0;display:flex;justify-content:center;align-items:center;margin:0;padding:20px;background:var(--pale);color:var(--muted);font-size:12px;line-height:1.5;text-align:center;pointer-events:none}
.player.single-view{grid-template-columns:minmax(0,1fr);max-width:760px;margin:auto}
.player.single-view .view-viewport{aspect-ratio:16/9;max-height:58vh}
.controls{display:flex;align-items:center;gap:10px;margin:15px 0 0}
.controls button{border:1px solid #c8d7e7;border-radius:6px;background:#fff;padding:10px 18px;color:var(--navy);font-size:13px;font-weight:700;cursor:pointer;min-height:42px}
.controls button:first-child{background:var(--navy);color:white;border-color:var(--navy)}
.controls button:hover{box-shadow:0 0 0 2px #82bfea40}
.controls #enlarge{margin-left:auto;background:#fff;color:var(--navy);border-color:#c8d7e7}
.status{font-size:13px;line-height:1.4;margin:12px 0 0;min-height:18px;color:var(--muted)}
.credit{font-size:11px;color:#7a889a;margin:4px 0 20px}
.back{font-size:12px;text-underline-offset:3px}
.search-label{display:block;font-size:12px;font-weight:700;margin:26px 0 9px}
input{width:100%;max-width:540px;border:1px solid #c8d7e7;border-radius:6px;padding:14px 16px;color:var(--ink);background:#fff}
input:focus,button:focus-visible,a:focus-visible{outline:3px solid #82bfea;outline-offset:3px}
.exercise-list{margin:30px 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:36px}
.exercise-list a{display:flex;justify-content:space-between;gap:18px;text-decoration:none;padding:17px 2px;border-bottom:1px solid var(--line);font-size:14px;line-height:1.4}
.exercise-list a:hover{color:#006f9f}
.exercise-list a span{color:#6d8cac}
footer{max-width:1280px;border-top:1px solid var(--line);margin:0 auto;padding:20px 36px 30px;display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-size:11px}
footer strong{color:var(--navy)}
.player.expanded{position:fixed;inset:0;z-index:100;width:100vw;height:100dvh;max-width:none;max-height:none;align-items:center;padding:70px 24px 24px;background:#101823;gap:18px}
.player.expanded .view-panel{max-height:calc(100dvh - 100px)}
.player.expanded .view-viewport{height:min(65vw,calc(100dvh - 145px));aspect-ratio:auto}
.close-player{position:absolute;top:max(16px,env(safe-area-inset-top));right:24px;z-index:101;background:#fff;color:var(--navy);border:1px solid var(--line);border-radius:6px;padding:12px 18px;font:700 14px Arial;cursor:pointer;box-shadow:0 2px 12px #0003}
@media(max-width:640px){
  .masthead{padding:12px 20px}
  .brand{width:146px;height:72px}
  .library-link{font-size:12px}
  main{margin-top:25px;padding:0 16px;margin-bottom:30px}
  .heading-row{align-items:flex-start;flex-direction:column;gap:10px}
  .silent{font-size:10px}
  h1{letter-spacing:-.8px;margin:13px 0 23px}
  .player{gap:8px}
  .view-panel{border-radius:6px}
  .view-label{font-size:11px;padding:10px}
  .view-viewport{aspect-ratio:3/4}
  .view-status{font-size:11px;padding:10px}
  .view-note{font-size:12px}
  .controls{gap:8px}
  .controls button{padding:10px 13px;font-size:12px}
  .exercise-list{grid-template-columns:1fr;gap:0;margin-top:22px}
  footer{padding:19px 20px 24px;flex-direction:column;gap:6px}
  .cue{font-size:14px}
  .player.expanded{gap:8px;padding:70px 8px 16px}
  .player.expanded .view-viewport{height:calc(100dvh - 150px)}
  .close-player{right:16px}
}