@font-face {
  font-family: 'Sohne';
  src: local('Söhne Buch'), local('Sohne Buch'), local('Soehne-Buch'), local('Sohne-Buch');
  font-weight: 400;
}
@font-face {
  font-family: 'Sohne';
  src: local('Söhne Halbfett'), local('Sohne Halbfett'), local('Soehne-Halbfett'), local('Sohne-Halbfett');
  font-weight: 600;
}
@font-face {
  font-family: 'Ivar Headline';
  src: local('Ivar Headline Regular'), local('IvarHeadline-Regular'), local('Ivar Headline');
  font-weight: 400;
}
:root {
  --school-sans: 'Sohne', Helvetica, Arial, sans-serif;
  --school-serif: 'Ivar Headline', Georgia, serif;
}
:root{color-scheme:dark;--bg:#08090a;--surface:#202124;--gold:#f2cd81;--paper:#faf7ef;--text:#d3d2cf;--muted:#b2b1ae;--line:#343537;--gutter:32px;--max:1200px}
*{box-sizing:border-box}
html{scroll-padding-top:82px}body{margin:0;background:var(--bg);color:var(--paper);font:400 16px/1.5 var(--school-sans);-webkit-font-smoothing:antialiased}
button,input{font:inherit;color:inherit}button{border:0;background:none;cursor:pointer}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}
h1,h2,h3,p{margin:0}h2{font-weight:650;line-height:1.16;font-size:32px;letter-spacing:-.045em}
.wrap{width:min(calc(100% - 2 * var(--gutter)),var(--max));margin-inline:auto}
button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--gold);outline-offset:4px}
[hidden]{display:none!important}.skip{position:fixed;z-index:100;left:8px;top:-80px;padding:10px;background:white;color:#000}.skip:focus{top:8px}
.productbar{background:#111214}.productbar .wrap{height:40px;display:flex;align-items:center;gap:32px;font-size:12px;font-weight:600}
.mast{position:sticky;top:0;z-index:8;background:#08090af7;border-bottom:1px solid #ffffff0a}.navline{height:64px;display:flex;align-items:center;gap:8px;position:relative}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;margin-right:12px}.brand img{width:30px;height:34px}.brand span{font:550 17px/.98 var(--school-serif);letter-spacing:-.065em}
.browse-toggle,.search{height:44px;background:var(--surface);border-radius:8px}.browse-toggle{display:flex;align-items:center;gap:12px;padding:0 20px;font-size:15px;font-weight:600}
.chevron{width:9px;height:9px;border:solid currentColor;border-width:0 1.5px 1.5px 0;transform:rotate(45deg);margin-top:-5px}
.search-wrap{position:relative;flex:1;max-width:400px;min-width:120px}.search{display:flex;align-items:center;gap:14px;padding:0 18px}.search input{background:none;border:0;outline:0;width:100%;min-width:0;font-size:15px}.search input::placeholder{color:var(--muted)}.search:focus-within{box-shadow:0 0 0 1px #aaa}
.magnifier{width:15px;height:15px;border:2px solid;border-radius:100%;position:relative;flex:none}.magnifier:after{content:'';position:absolute;width:7px;height:2px;background:currentColor;right:-5px;bottom:-3px;transform:rotate(46deg)}
.navlinks{margin-left:auto;display:flex;align-items:center;gap:22px;font-size:14px;white-space:nowrap}.navlinks a:hover,.productbar a:hover,footer a:hover,.text-link:hover{text-decoration:underline}
.cta{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:44px;padding:12px 22px;background:var(--gold);color:#19160e;font-size:15px;font-weight:680;border-radius:8px;line-height:1.18;text-align:center}.cta:hover{background:#ffdc94}.mast .cta{margin-left:12px}
.mobile-browse,.mobile-monogram{display:none}.dropdown{padding:8px;background:#252628;box-shadow:0 12px 25px #0009;border:1px solid #444548;border-radius:10px;position:absolute;z-index:9}.dropdown a,.dropdown p{padding:9px 12px;display:block;border-radius:5px}.dropdown a:hover,.dropdown a:focus-visible{background:#3b3c40}.browse-panel,.mobile-panel{top:58px;min-width:245px;max-height:70dvh;overflow:auto;font-size:14px}.browse-panel{left:145px}.mobile-panel{right:0}.all-cats{border-top:1px solid #49494a;font-weight:650}.search-results{top:50px;left:0;right:0;max-height:55vh;overflow:auto}.search-results small{display:block;color:#bababe;font-size:12px}
.hero{display:grid;grid-template-columns:1fr 1fr;min-height:700px}.portrait{position:relative;overflow:hidden;background:#1b1a1a}.portrait img{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;object-position:55% 35%}.portrait:after{content:'';position:absolute;inset:0;background:linear-gradient(to top,var(--bg),#08090a80 20%,transparent 43%)}
.hero-panel{display:grid;place-items:center;background:linear-gradient(to top,var(--bg),#232427);padding:40px var(--gutter)}.hero-content{width:100%;text-align:center}.course-titles{margin:auto}.nameplate{font-size:clamp(58px,5vw,78px);font-weight:350;line-height:.88;letter-spacing:-.072em}.nameplate em{font-family:var(--school-serif);font-weight:400;letter-spacing:-.075em}.small-rule{height:3px;width:17px;margin:22px auto 12px;background:var(--gold)}.course-titles h1{font-size:18px;font-weight:650;line-height:1.23;letter-spacing:-.03em}
.summary{font-size:15px;line-height:1.48;max-width:440px;margin:18px auto 0;text-wrap:pretty;color:#e2e1df}.metadata{font-size:14px;display:flex;align-items:baseline;justify-content:center;gap:8px;margin-top:16px}.meta-dot{color:var(--muted)}.link-button,.plain,.text-link{font-weight:600;padding:0}.link-button{text-decoration:underline;text-underline-offset:2px}
.offer{border:1px solid #343537;border-radius:16px;background:linear-gradient(#87878728,#0002);max-width:420px;margin:30px auto 0;padding:17px 24px 18px;text-align:center}.offer img{width:32px;height:36px;margin:0 auto}.offer p{margin-top:8px}.offer .cta{width:100%;margin:15px auto 8px}.offer small{display:block;font-size:13px;line-height:20px;color:var(--muted)}
.skills{margin-top:84px}.skills .plain{margin-top:4px;font-size:14px}.plain:hover,.link-button:hover{color:var(--gold)}
.skill-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:20px}.skill-tile{display:block;position:relative;isolation:isolate;border-radius:12px;overflow:hidden;aspect-ratio:300/376}.skill-tile img,.course-card .cover{width:100%;height:100%;object-fit:cover;object-position:center 34%;transition:transform .25s ease}.skill-tile:hover img,.card-link:hover .cover{transform:scale(1.025)}.skill-tile:after{content:'';position:absolute;inset:0;background:linear-gradient(transparent 32%,#0001 50%,#000c)}.skill-tile .number,.area-number{position:absolute;z-index:1;top:16px;left:16px}.number{display:grid;place-items:center;width:34px;height:34px;border-radius:100%;background:var(--gold);color:#16130e;font-weight:650}.skill-tile strong{position:absolute;z-index:1;bottom:20px;left:10px;right:10px;text-align:center;font-size:19px;line-height:1.18;color:white;letter-spacing:-.035em}
.media-section,.related,.founder-section,.journey{margin-top:64px}.player{aspect-ratio:16/9;background:#202020;border-radius:16px;overflow:hidden;position:relative}.poster{width:100%;height:100%;object-fit:cover}.video-tabs{position:absolute;top:18px;right:20px;display:flex;gap:6px}.video-tabs button,.runtime{border-radius:5px;color:white;background:#111c;padding:4px 8px;font-size:14px;font-weight:600}.runtime{position:absolute;bottom:16px;right:18px;font-size:12px}
.section-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.section-head p{color:var(--muted);margin:5px 0 14px}.arrows,.dots{display:flex;align-items:center;gap:8px}.arrows button,.close{border-radius:50%;background:#37383b;display:grid;place-items:center}.arrows button{width:40px;height:40px;font:32px/1 Arial}.arrows button:disabled{opacity:.35;cursor:default}
.course-rail{display:flex;gap:12px;overflow-x:auto;scroll-snap-type:x mandatory;padding:8px 0;scrollbar-width:none}.course-card{position:relative;flex:0 0 20%;aspect-ratio:9/16;border-radius:12px;overflow:hidden;scroll-snap-align:start}.card-link{position:absolute;inset:0}.card-link:before{content:'';position:absolute;inset:0;z-index:1;background:linear-gradient(#0004,transparent 22%,transparent 30%,#0004 52%,#000e)}.card-link:focus-visible{outline-offset:-3px}.area-number{top:12px;left:12px;color:white;font-weight:650;font-size:12px;background:#141414c9;border-radius:20px;padding:4px 9px}.card-content{position:absolute;z-index:2;inset:auto 12px 22px;display:grid;justify-items:center;gap:12px;text-align:center;color:white}.card-content strong{font-size:clamp(18px,1.7vw,26px);font-weight:560;line-height:1.06;letter-spacing:-.055em}.card-action{font-size:12px;font-weight:650;padding:6px 10px;border:1px solid #fff7;border-radius:6px}
.dots{margin-top:8px;justify-content:center;gap:4px}.dots button{width:22px;height:24px;padding:0;position:relative}.dots button:before{content:'';position:absolute;inset:10px 1px;background:#454548;border-radius:4px}.dots button[aria-current=true]:before{background:var(--gold)}
.founder{display:grid;grid-template-columns:.9fr 1.1fr;align-items:stretch;border-radius:16px;overflow:hidden;background:#202124;max-width:1040px;margin:0 auto}.founder-photo{width:100%;height:415px;object-fit:cover;object-position:50% 32%}.founder-copy{align-self:center;padding:40px clamp(28px,5vw,76px)}.kicker,.eyebrow{font-size:12px;font-weight:650;letter-spacing:.04em;color:var(--gold)}.founder-copy h2{font:450 clamp(35px,3.5vw,54px)/1.1 var(--school-serif);letter-spacing:-.06em;margin:9px 0 16px}.founder-copy>p:not(.kicker){font-size:16px;line-height:1.6;color:var(--text)}.text-link{display:inline-flex;gap:8px;color:var(--gold);margin-top:14px}
.faq{margin-top:88px}.faq h2{text-align:center}.faq-list{max-width:752px;margin:32px auto 0}.faq-list details{background:#222326;margin:8px 0;border-radius:8px}.faq-list summary{list-style:none;font-weight:600;cursor:pointer;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:15px}.faq-list summary::-webkit-details-marker{display:none}.faq-list details p{padding:0 24px 20px;color:var(--text)}
.journey{text-align:center;padding-block:28px 72px}.journey img{margin:0 auto 14px}.journey p{margin:12px 0 18px;color:var(--muted)}
footer{border-top:1px solid #333;padding:32px 0 110px}.foot,.foot nav{display:flex;align-items:center;gap:24px}.foot{justify-content:space-between}.foot nav{font-size:13px;color:var(--muted)}
.sticky-offer{background:#191b20f7;position:fixed;z-index:6;bottom:0;left:0;right:0;transform:translateY(110%);visibility:hidden;transition:transform .2s,visibility .2s}.sticky-offer.visible{transform:none;visibility:visible}.sticky-offer .wrap{min-height:74px;display:flex;align-items:center;gap:14px}.sticky-offer p{font-size:14px;line-height:1.35}.sticky-offer small{display:block;font-size:12px;color:var(--muted)}.sticky-offer .cta{margin-left:auto}
dialog{border:1px solid #414244;background:#222326;color:var(--paper);border-radius:14px;padding:0;box-shadow:0 12px 50px #0008;max-height:88dvh}dialog::backdrop{background:#08090bcc}body:has(dialog[open]){overflow:hidden}.dialog-head{position:sticky;top:0;z-index:2;background:#222326;display:flex;align-items:center;justify-content:space-between;padding:16px 22px;border-bottom:1px solid #393a40;gap:12px}.dialog-head h2{font-size:22px}.close{width:36px;height:36px;font:25px/1 Arial;color:white;flex:none}
#chapters{width:min(480px,calc(100% - 28px))}.chapters{padding:8px 22px 16px;list-style:none;margin:0;counter-reset:chapter}.chapters li{display:grid;grid-template-columns:24px 1fr;gap:10px;align-items:baseline;counter-increment:chapter;padding:10px 0}.chapters li:before{content:counter(chapter,decimal-leading-zero);color:var(--gold);font-size:13px}.chapters a{display:flex;align-items:baseline;gap:12px;justify-content:space-between}.chapters small{display:block;color:var(--muted);font-size:13px;line-height:1.4;margin-top:3px}.chapters i{font-style:normal;color:var(--gold)}.chapters a:hover b{text-decoration:underline}
#film{width:min(920px,calc(100% - 24px));background:#141516}#film video{display:block;width:100%;max-height:65dvh;aspect-ratio:16/9;background:black}.film-foot{display:flex;align-items:start;justify-content:space-between;gap:16px;padding:16px 20px;font-size:13px}.film-foot summary{cursor:pointer}.film-foot p{margin-top:8px;color:var(--muted)}.film-foot .text-link{margin:0;flex:none}
@media(max-width:959px){:root{--gutter:24px}.productbar{display:none}.navlinks{display:none}.mast .cta{margin-left:auto}.search-wrap{max-width:400px}.summary{max-width:400px}.hero{min-height:640px}.hero-panel{padding-inline:24px}.offer{padding-inline:18px}.card-content strong{font-size:19px}}
@media(max-width:767px){
 :root{--gutter:16px}html{scroll-padding-top:72px}h2{font-size:26px}
 .navline{height:60px;gap:6px}.brand{order:0;gap:6px;margin-right:auto}.brand img{width:25px;height:30px}.brand span{font-size:14px}
 .browse-toggle{order:1;background:none;font-size:13px;padding:0 4px;gap:7px}.search-wrap{display:none}.mast .cta{order:2;margin:0 0 0 3px;min-height:37px;padding:9px 12px;font-size:13px}.mobile-browse{display:grid;justify-items:center;align-content:center;gap:4px;width:28px;height:40px;order:3}.mobile-browse span{width:15px;height:1.5px;background:currentColor}.browse-panel{left:0;right:0;top:55px}.mobile-panel{top:55px}
 .hero{display:block;min-height:0}.portrait{aspect-ratio:1.6}.portrait img{object-position:50% 22%}.portrait:after{background:linear-gradient(transparent 42%,#08090a40 65%,var(--bg))}.hero-panel{display:block;background:transparent;padding:0 var(--gutter);position:relative;margin-top:-65px}.hero-content{text-align:left}.mobile-monogram{display:block;width:22px;height:25px;margin-bottom:10px}.nameplate{font-size:60px;line-height:.85;text-shadow:0 2px 14px #0008}.small-rule{display:none}.course-titles h1{margin-top:16px}.summary{max-width:none;margin:10px 0 0;color:var(--text);font-size:14px}.metadata{justify-content:flex-start;margin-top:14px;font-size:13px}.offer{max-width:none;margin-top:22px;padding:17px 18px}.offer img{width:27px;height:31px}.offer p{font-size:15px}
 .skills{margin-top:54px}.skill-grid{grid-template-columns:1fr;gap:14px;margin-top:18px}.skill-tile{aspect-ratio:300/376}.skill-tile strong{font-size:25px;left:24px;right:24px;bottom:20px}.media-section,.related,.founder-section,.journey{margin-top:44px}.player{border-radius:10px}.video-tabs{top:8px;right:8px}.video-tabs button{font-size:12px}.runtime{right:8px;bottom:8px}
 .course-card{flex-basis:min(61%,230px)}.section-head p{font-size:14px}.arrows{gap:5px}.arrows button{width:32px;height:32px;font-size:24px}.card-content strong{font-size:22px}
 .founder{display:block}.founder-photo{height:auto;max-height:360px;aspect-ratio:1.3;object-position:50% 35%}.founder-copy{padding:25px}.founder-copy h2{font-size:38px}.founder-copy>p:not(.kicker){font-size:15px}
 .faq{margin-top:52px}.faq-list{margin-top:24px}.faq-list summary{padding:16px;font-size:14px}.faq-list details p{padding:0 16px 16px;font-size:14px}.journey{padding-bottom:48px}.journey p{font-size:14px}.foot{align-items:start;gap:18px}.foot nav{flex-direction:column;align-items:start;gap:10px}
 .sticky-offer .wrap{min-height:66px;gap:8px;padding:8px 0}.sticky-offer .wrap>img{display:none}.sticky-offer p{font-size:12px}.sticky-offer small{font-size:10px}.sticky-offer .cta{padding:10px 13px;font-size:13px}
 .film-foot{flex-wrap:wrap}
}
@media(max-width:355px){.navline{gap:3px}.brand span{font-size:12px}.mast .cta{padding:8px;font-size:12px}.browse-toggle{font-size:12px}.skill-tile strong{font-size:22px}}
@media(min-width:768px){.mobile-panel{display:none}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition-duration:.001s!important;scroll-behavior:auto!important}}
@media(max-width:767px){.portrait img{object-position:50% 8%}.nav-cta{white-space:nowrap}}
@media(max-width:425px){.browse-toggle{display:none}.navline{gap:9px}.mobile-browse{width:34px}}

.institute-tools{text-align:center;padding-block:clamp(52px,7vw,96px)}.institute-tools h2{font-size:clamp(36px,4vw,64px);line-height:1.03}.institute-tools .benefits{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:30px auto;max-width:940px}.benefits article{text-align:left}.benefits article img{width:100%;aspect-ratio:1.65;object-fit:cover;border-radius:8px}.benefits article h3{margin:15px 0 6px}.benefits article p{color:var(--text);font-size:15px}@media(max-width:650px){.institute-tools .benefits{grid-template-columns:1fr;max-width:400px}}

.ui-icon{display:inline-block;flex:none;vertical-align:-.18em;pointer-events:none}
button.close,.arrows button{align-items:center;justify-content:center;display:inline-flex}
.close .ui-icon,.arrows .ui-icon{width:20px;height:20px}
.faq-list summary .ui-icon{margin-left:auto}.faq-list .icon-minus,.faq-list details[open] .icon-plus{display:none}.faq-list details[open] .icon-minus{display:inline-block}
.browse-toggle[aria-expanded=true] .icon-down{transform:rotate(180deg)}

.nameplate,.nameplate em{font-family:var(--school-serif);font-weight:500;font-style:normal;letter-spacing:-.035em;line-height:.88}
.nameplate{font-size:clamp(66px,6.7vw,106px)}
.brand span,.founder-copy h2{letter-spacing:-.025em}
.skills h2,.section-head h2,.faq h2,.journey h2,.institute-tools h2{font:600 clamp(36px,3.8vw,60px)/1.03 var(--school-serif);letter-spacing:-.025em}

.offer{box-shadow:1px 2px 3px #0006,6px 15px 27px -10px #0009}
.dropdown,dialog{box-shadow:1px 3px 6px #0006,8px 24px 46px -10px #000b}
.search{box-shadow:inset 1px 2px 4px #0005}
@media(max-width:767px){.nameplate{text-shadow:none}}

.nameplate,.nameplate em{font-weight:600;letter-spacing:-.018em}
.brand span{font-weight:600;letter-spacing:0}
.course-titles h1{letter-spacing:0}
.metadata{align-items:center;flex-wrap:wrap}
.metadata .gold-action,.skills .gold-action,.founder-copy .gold-action,.film-foot .gold-action{
  display:inline-flex;align-items:center;gap:8px;padding:9px 14px;border-radius:6px;line-height:1.25
}
.skills .gold-action{margin-top:12px}
.card-action{display:inline-flex;align-items:center;gap:6px}

.nameplate,.nameplate em,.brand span,.founder-copy h2,.skills h2,.section-head h2,.faq h2,.journey h2,.institute-tools h2{font-weight:400}

.student-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding-inline: 8px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.student-login:hover,.inline-link { text-decoration: underline; text-underline-offset: 3px; }
.inline-link { color: var(--paper); }
.inline-link:hover { text-decoration-thickness: 2px; }
.school-copy { max-width: 60ch; margin-top: 10px; color: var(--text); }
.chapter-intro { margin: 16px 22px 0; color: var(--text); font-size: 14px; }
#enrollment { max-width: 760px; }
#enrollment-copy { max-width: 50ch; margin-inline: auto; text-wrap: pretty; }
#enrollment .enrollment-note { margin: 12px 0 0; font-size: 13px; }
#enrollment-title:focus { outline: none; }
@media (min-width: 768px) and (max-width: 959px) {
  .student-login { margin-left: auto; }
  .mast .nav-cta { margin-left: 0; }
}
@media (max-width: 767px) {
  .student-login { order: 1; padding-inline: 4px; font-size: 13px; }
}
@media (max-width: 355px) {
  .navline { gap: 5px; }
  .student-login { padding-inline: 2px; }
}

/* Only the ring and triangle frost the image. The space between them is open. */
.play {
  --rim: clamp(6px, .66vw, 9px);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: grid;
  place-items: center;
  width: clamp(62px, 8vw, 86px);
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  -webkit-tap-highlight-color: transparent;
}
.play:focus-visible { outline: 2px solid white; outline-offset: 6px; }
.play::before,.play-glyph {
  -webkit-backdrop-filter: blur(5px) saturate(0);
  backdrop-filter: blur(5px) saturate(0);
}
.play::before {
  content: '';
  position: absolute;
  inset: 0;
  border: var(--rim) solid rgb(246 248 250 / .87);
  border-radius: 50%;
}
@supports (mask-image: radial-gradient(black,transparent)) or (-webkit-mask-image: radial-gradient(black,transparent)) {
  .play::before {
    --ring: radial-gradient(farthest-side, transparent calc(100% - var(--rim) - .5px), black calc(100% - var(--rim) + .5px));
    border: 0;
    background: linear-gradient(144deg, #ffffffed 4%, #edf0f2c7 43%, #c4c9ceab 70%, #ffffffdf 98%);
    box-shadow: inset 0 1px 1px #fffffff0, inset 0 -1px 1px #85888a8c;
    -webkit-mask-image: var(--ring);
    mask-image: var(--ring);
  }
}
.play-glyph {
  width: 31%;
  height: 35%;
  margin-left: 5%;
  background: linear-gradient(145deg, #fffffff5, #e9ecefdc 55%, #cdd1d5bf);
  clip-path: polygon(4% 3%, 9% 2%, 97% 47%, 99% 50%, 97% 53%, 9% 98%, 4% 97%);
}
@media (forced-colors: active) {
  .play::before { border: var(--rim) solid ButtonText; background: transparent; mask-image: none; -webkit-mask-image: none; }
  .play-glyph { background: ButtonText; forced-color-adjust: none; }
}
/* The casebook is lit from its upper left.
   Contact and cast shadows on the cover are part of the physical render. */
.casebook-sample {
  display: grid;
  grid-template-columns: 36% minmax(0, 1fr);
  align-items: center;
  max-width: 470px;
  margin: 12px 20px 22px;
  padding: 0 20px 0 0;
  text-align: left;
  background: radial-gradient(ellipse at 14% 17%, #333537, #232426 58%, #1c1d1f);
  border: 1px solid #38393b;
  border-top-color: #454648;
  border-radius: 12px;
  box-shadow: 1px 2px 3px #0006, 6px 13px 22px -12px #000b;
}
.lesson-object {
  position: relative;
  display: block;
  width: 113%;
  max-width: none;
  height: auto;
  margin: -12% 0 -10% -5%;
}
.lesson-cover { display: block; width: 100%; height: auto; }
.lesson-poses {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background-repeat: no-repeat;
  background-size: 1200% 100%;
  background-position: 0% 0;
}
@media (prefers-reduced-motion: no-preference) {
  .cover-ready .lesson-cover { visibility: hidden; }
  .cover-ready .lesson-poses { opacity: 1; transition: background-position-x 360ms steps(11, end); }
  .cover-ready:has(.cta:focus-visible) .lesson-poses { background-position-x: 100%; }
}
@media (hover: hover) and (prefers-reduced-motion: no-preference) {
  .cover-ready:has(.cta:hover) .lesson-poses { background-position-x: 100%; }
}
.lesson-invite {
  position: relative;
  padding: 18px 0;
}
.lesson-invite p {
  font: 400 clamp(21px, 1.85vw, 27px)/1.08 var(--school-serif);
  letter-spacing: -.025em;
}
.lesson-invite small {
  display: block;
  margin: 7px 0 12px;
  font-size: 13px;
  line-height: 1.42;
  color: var(--text);
}
.lesson-invite .cta {
  max-width: 100%;
  justify-content: space-between;
  min-height: 42px;
  padding: 10px 15px;
}
@media (max-width: 959px) {
  .casebook-sample { grid-template-columns: 33% minmax(0, 1fr); padding-right: 15px; }
  .lesson-invite .cta { font-size: 14px; gap: 7px; }
}
@media (max-width: 767px) {
  .casebook-sample { margin: 10px 14px 18px; }
}
@media (max-width: 359px) {
  .casebook-sample { grid-template-columns: 29% minmax(0, 1fr); padding-right: 11px; }
  .lesson-invite { padding: 15px 0 15px 3px; }
}

/* The lesson opens to a printed spread. The answering surface is usable
   immediately; the gutter and exposed sheet edges also read with motion off. */
#practice {
  --lesson-stock: #f7f4eb;
  --lesson-ink: #212120;
  width: min(780px, calc(100% - 28px));
  max-height: min(90dvh, 720px);
  background: #1b1c1e;
  border-color: #414244;
  border-radius: 12px;
  box-shadow: 1px 3px 6px #0008, 13px 30px 48px -14px #000c;
}
#practice .dialog-head {
  background: #1b1c1e;
  padding-block: 10px;
  border-bottom: 1px solid #ffffff0d;
}
.exercise {
  margin: 12px 14px 20px;
  display: grid;
  grid-template-columns: .93fr 1.07fr;
  align-items: stretch;
  position: relative;
  isolation: isolate;
  color-scheme: light;
  color: var(--lesson-ink);
  background: var(--lesson-stock);
  border-radius: 2px;
  box-shadow: 0 1px #b7b0a1, 1px 2px #ede7db, 1px 3px #a8a295,
    2px 4px #dcd7cd, 3px 6px 5px #0005, 8px 12px 16px -8px #0008;
}
.lesson-brief,
.lesson-reply {
  min-width: 0;
  padding: clamp(24px, 3vw, 39px);
}
.lesson-brief {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(to right, #fbf8f0, #f4f0e7 83%, #e9e4d9 96%, #c1b9aa);
  border-radius: 2px 0 0 2px;
}
.lesson-brief .eyebrow {
  color: #575347;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .02em;
}
.lesson-brief h2 {
  margin: 15px 0;
  color: var(--lesson-ink);
  font: 400 clamp(28px, 2.6vw, 39px)/1.11 var(--school-serif);
  letter-spacing: -.035em;
  text-wrap: balance;
}
.lesson-reply {
  background: linear-gradient(to right, #c9c2b4, #eee8db 2%, var(--lesson-stock) 8%);
  border-radius: 0 2px 2px 0;
}
.lesson-reply > p { font-size: 17px; line-height: 1.35; font-weight: 600; }
.answers { display: grid; gap: 9px; margin: 17px 0 0; }
.answers button {
  padding: 12px 14px;
  min-height: 44px;
  background: #fffdf8;
  color: var(--lesson-ink);
  border: 1px solid #b6afa2;
  border-radius: 6px;
  text-align: left;
  font-size: 14px;
  line-height: 1.4;
}
.answers button[aria-pressed=true] {
  background: #e6e1d5;
  border-color: #5c5548;
  box-shadow: inset 1px 2px 3px #40372522;
}
.lesson-reply :focus-visible { outline-color: #675128; }
#feedback:not(:empty) { padding-top: 14px; font-size: 14px; line-height: 1.5; }
#practice-next { margin-top: 14px; }

@media (prefers-reduced-motion: no-preference) and (min-width: 601px) {
  #practice[open] .lesson-brief {
    transform-origin: right center;
    animation: unfold-brief 320ms cubic-bezier(.16,.75,.3,1) both;
  }
  @keyframes unfold-brief {
    from { transform: perspective(900px) rotateY(13deg); }
    to { transform: perspective(900px) rotateY(0); }
  }
}
@media (max-width: 600px) {
  #practice .dialog-head { padding: 7px 14px; }
  .exercise { display: block; margin: 7px 9px 15px; }
  .lesson-brief,.lesson-reply {
    padding: 20px clamp(18px, 6vw, 30px);
    background: linear-gradient(90deg, #e0d9ca, var(--lesson-stock) 4%);
  }
  .lesson-brief { padding-bottom: 0; }
  .lesson-brief h2 { margin: 10px 0 0; text-wrap: pretty; font-size: 29px; }
  .lesson-reply { padding-top: 15px; }
  .lesson-reply > p { border-top: 1px solid #c6c0b3; padding-top: 15px; font-size: 15px; }
  .answers { margin-top: 12px; }
}
.gold-action,
.gold-action:hover,
.worksheet .gold-action,
.video-tabs .gold-action {
  color: #221602;
  border: 0;
  background: linear-gradient(105deg, #d4a64f, #efd089 47%, #daae57);
  box-shadow: none;
  text-shadow: none;
  text-decoration: none;
  isolation: isolate;
  overflow: hidden;
  font-weight: 600;
}
.gold-action:active {
  translate: 0 1px;
}
.gold-action {
  position: relative;
}
.gold-action::before {
  content: '';
  pointer-events: none;
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(108deg, transparent 40%, #fff1c74d 47%,
    #fff7dbeb 50%, #fff1c74d 53%, transparent 60%);
  transform: translateX(-100%);
  animation: gold-pass 2.4s linear infinite;
}
@keyframes gold-pass {
  0% { transform: translateX(-100%); }
  14%, 100% { transform: translateX(100%); }
}
@media (prefers-reduced-motion: reduce) {
  .gold-action::before { animation: none; }
}