/* The existing split panel, sticky navigation and reveal motion stay in place. */
/* CosaWell-inspired atmosphere: pale cyan, soft yellow and translucent light bars. */
#lesson{position:relative;isolation:isolate;background:#e4f7fd}
#lesson .course-atmosphere{position:absolute;inset:0;z-index:-1;overflow:clip;pointer-events:none}
#lesson .course-atmosphere__viewport{position:sticky;top:0;height:100svh;min-height:600px;overflow:hidden}
#lesson .course-atmosphere__wash{position:absolute;inset:-35% -50%;opacity:.5;background:radial-gradient(ellipse at 25% 42%,#fff7af 0,transparent 42%),radial-gradient(ellipse at 72% 28%,#00ade9 0,transparent 42%),radial-gradient(ellipse at 58% 80%,#fff7af 0,transparent 38%),radial-gradient(ellipse at 20% 92%,#00ade9 0,transparent 36%),radial-gradient(ellipse at 51% 50%,#fff 0,transparent 44%);animation:course-atmosphere-drift 75s ease-in-out infinite;animation-play-state:paused}
#lesson .course-atmosphere__bar{position:absolute;top:var(--bar-top);right:var(--bar-right);height:clamp(27px,4.2vw,67px);width:var(--bar-width);background:linear-gradient(90deg,rgb(255 255 255 / .5),rgb(255 255 255 / 0));mix-blend-mode:overlay;transform:scaleX(0);transform-origin:right center;opacity:0;animation:course-atmosphere-light 10.8s cubic-bezier(.23,1,.32,1) var(--bar-delay) infinite;animation-play-state:paused}
#lesson[data-atmosphere-active] .course-atmosphere__wash,#lesson[data-atmosphere-active] .course-atmosphere__bar{animation-play-state:running}
@keyframes course-atmosphere-drift{0%,100%{transform:translate(0,0) scale(1)}25%{transform:translate(-15%,-8%) scale(1.25)}50%{transform:translate(-6%,-15%) scale(1)}75%{transform:translate(12%,-20%) scale(1.05)}}
@keyframes course-atmosphere-light{0%{transform:scaleX(0);opacity:0}1.4%{opacity:1}7.4%,90%{transform:scaleX(1);opacity:1}98%,100%{transform:scaleX(0);opacity:0}}
@media(max-width:700px){#lesson .course-atmosphere__viewport{min-height:500px}#lesson .course-atmosphere__wash{animation-duration:100s}#lesson .course-atmosphere__bar{width:calc(var(--bar-width) * .58);height:27px}}
@media(prefers-reduced-motion:reduce){#lesson .course-atmosphere__wash{animation:none;transform:none}#lesson .course-atmosphere__bar{animation:none;transform:scaleX(1);opacity:.65}}
#lesson .panel-content{min-width:0}
#lesson .panel-nav{max-height:calc(100svh - 135px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:#d9cfc7 transparent}
#lesson .panel-nav a{font-size:13px;line-height:1.7;padding-top:15px;padding-bottom:15px;gap:14px}
#lesson .panel-nav a span{min-width:0;overflow-wrap:anywhere}
#lesson .panel-nav .course-nav-chunk{display:block;white-space:normal}
#lesson .panel-nav .course-nav-chunk+span{font-size:11px;line-height:1.6;font-weight:400;margin-top:3px}
#lesson .panel-nav a:after{flex-shrink:0}
#lesson .lesson-title{align-items:flex-start}
#lesson .lesson-title h3{padding-top:5px;font-size:23px;line-height:1.65}
#lesson .course-title-suffix{display:inline-block;white-space:nowrap}
#lesson .course-description{font-size:14px;line-height:2.1;margin-bottom:28px}
#lesson .course-curriculum{background:#eff4f8;border-radius:8px;padding:18px 14px 16px;overflow:hidden}
#lesson .course-thumbnail{display:block;width:min(100%,660px);height:auto;aspect-ratio:16/9;object-fit:contain;margin:0 auto 24px;border-radius:7px}
#lesson .course-steps{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0;padding:0;letter-spacing:0}
#lesson .course-step{display:grid;grid-template-rows:80px 1fr 1fr;gap:10px;min-width:0}
#lesson .course-step-heading{margin:0 -9px 0 0;padding:10px 17px 10px 15px;min-height:72px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:5px;background:var(--step-color);color:#fff;font-size:12px;line-height:1.55;font-weight:700;clip-path:polygon(0 0,calc(100% - 11px) 0,100% 50%,calc(100% - 11px) 100%,0 100%,11px 50%)}
#lesson .course-step:first-child .course-step-heading{padding-left:10px;clip-path:polygon(0 0,calc(100% - 11px) 0,100% 50%,calc(100% - 11px) 100%,0 100%)}
#lesson .course-step:last-child .course-step-heading{margin-right:0;clip-path:polygon(0 0,100% 0,100% 100%,0 100%,11px 50%)}
#lesson .course-step-number{display:inline-block;padding:1px 9px;border-radius:20px;background:#fff;color:var(--step-color);font-size:10px;line-height:1.45;white-space:nowrap;letter-spacing:.02em}
#lesson .course-topic{padding:13px 11px;background:#fff;border-radius:8px;min-width:0}
#lesson .course-topic h5{margin:0 0 10px;padding-left:9px;border-left:3px solid var(--step-color);font-size:13px;line-height:1.6;font-weight:700;overflow-wrap:anywhere}
#lesson .course-topic-body{display:flex;align-items:flex-start;gap:7px}
#lesson .course-topic p{flex:1;min-width:0;font-size:11px;line-height:1.85;overflow-wrap:anywhere}
#lesson .course-sample-note{text-align:right;font-size:11px;line-height:1.8;color:#81766e;margin-top:20px}
@media(min-width:701px) and (max-width:1100px){
  #lesson .panel-content{padding-inline:24px}
  #lesson .panel-nav{padding-inline:20px}
  #lesson .panel-nav a.active:before{left:-20px}
  #lesson .panel-nav a{font-size:11px;gap:7px}
  #lesson .course-curriculum{padding-inline:10px}
  #lesson .course-steps{gap:7px}
  #lesson .course-topic{padding:11px 9px}
  #lesson .course-step{grid-template-rows:88px 1fr 1fr}
  #lesson .course-step-heading{min-height:82px;font-size:11px}
}
@media(max-width:700px){
  #lesson .panel-nav{max-height:none;overflow-y:hidden;overflow-x:auto;padding:0 12px;scrollbar-width:none}
  #lesson .panel-nav a{font-size:11px;line-height:1.7;padding:18px 0;gap:8px}
  #lesson .panel-nav a span{overflow-wrap:normal}
  #lesson .panel-content{padding-inline:20px}
  #lesson .lesson-title{gap:12px;margin-bottom:18px}
  #lesson .lesson-title h3{font-size:20px;padding-top:2px;line-height:1.6}
  #lesson .course-description{font-size:13px;margin-bottom:23px}
  #lesson .course-curriculum{padding:12px 10px}
  #lesson .course-thumbnail{margin:0 0 20px;aspect-ratio:16/9}
  #lesson .course-steps{grid-template-columns:1fr;gap:20px}
  #lesson .course-step{grid-template-rows:auto auto auto;gap:9px}
  #lesson .course-step-heading,#lesson .course-step:first-child .course-step-heading,#lesson .course-step:last-child .course-step-heading{margin:0;padding:10px 14px;min-height:45px;flex-direction:row;align-items:center;justify-content:flex-start;gap:10px;font-size:12px;clip-path:none;border-radius:4px}
  #lesson .course-step-heading>span:last-child{flex:1}
  #lesson .course-step-number{font-size:10px}
  #lesson .course-topic{padding:14px 13px}
  #lesson .course-topic h5{font-size:13px;line-height:1.6;margin-bottom:8px}
  #lesson .course-topic-body{gap:10px}
  #lesson .course-topic p{font-size:12px;line-height:1.85}
  #lesson .course-sample-note{text-align:left;font-size:10px}
}
/* Actual mottoAI curriculum within the original three-step flow. */
#lesson .course-intro{font-size:14px;line-height:2.1;max-width:700px;margin:22px auto 0;color:#6c635d}
#lesson .course-total{display:flex;justify-content:center;align-items:baseline;gap:8px;margin:-28px 0 46px;font-size:13px;color:#71655c}
#lesson .course-total strong{font-size:24px;font-weight:600;letter-spacing:.02em}
#lesson .course-total>span{margin:0 8px;color:#c2b7ad}
#lesson .course-title-subtitle{display:block;font-size:.72em;font-weight:500;line-height:1.8;margin-top:2px;color:#74695f}
#lesson .course-meta{display:flex;flex-wrap:wrap;gap:7px 12px;margin:0 0 18px;font-size:11px;line-height:1.8;color:#74695f}
#lesson .course-meta span:first-child{color:var(--course-accent);font-weight:700}
#lesson .course-meta span+span:before{content:"";display:inline-block;width:3px;height:3px;vertical-align:middle;background:#b8aaa0;border-radius:50%;margin-right:12px}
#lesson .course-syllabus{margin-top:22px;border:1px solid #d9e1e7;border-radius:6px;background:#fff;overflow:hidden}
#lesson .course-syllabus summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;padding:14px 18px;cursor:pointer;list-style:none;font-size:13px;line-height:1.7;font-weight:500}
#lesson .course-syllabus summary::-webkit-details-marker{display:none}
#lesson .course-syllabus summary:hover{background:#f9fbfd}
#lesson .course-syllabus summary:focus-visible{outline:2px solid var(--course-accent);outline-offset:-3px}
#lesson .course-syllabus-icon{font-size:20px;font-weight:400;line-height:1;transition:rotate .2s ease}
#lesson .course-syllabus[open] .course-syllabus-icon{rotate:45deg}
#lesson .course-syllabus-body{padding:0 18px 18px}
#lesson .course-syllabus-unit{padding-top:20px}
#lesson .course-syllabus-unit h4{font-size:13px;line-height:1.8;color:var(--course-accent);margin:0 0 8px}
#lesson .course-syllabus-unit ol{list-style:none;padding:0;margin:0}
#lesson .course-syllabus-unit li{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;border-bottom:1px solid #eee;padding:10px 0;font-size:12px;line-height:1.85}
#lesson .course-syllabus-unit li span{min-width:0;overflow-wrap:anywhere}
#lesson .course-syllabus-unit time{white-space:nowrap;font-size:11px;color:#8a7d72;flex-shrink:0}
@media(max-width:700px){
 #lesson .course-intro{font-size:13px;text-align:left;margin-top:18px}
 #lesson .course-intro br{display:none}
 #lesson .course-total{margin:0 0 30px;gap:5px;font-size:12px}
 #lesson .course-total strong{font-size:22px}
 #lesson .panel-nav .course-nav-chunk{white-space:nowrap}
 #lesson .panel-nav .course-nav-chunk+span{font-size:10px}
 #lesson .course-meta{font-size:10px;margin-bottom:16px;gap:4px 8px}
 #lesson .course-syllabus summary{padding:14px 12px;font-size:12px}
 #lesson .course-syllabus-body{padding:0 12px 14px}
 #lesson .course-syllabus-unit li{gap:10px;font-size:11px}
}
@media(prefers-reduced-motion:reduce){#lesson .course-syllabus-icon{transition:none}}

/* Show eight courses at a time without changing the split panel. */
#lesson .course-card[hidden],#lesson .course-more[hidden],#lesson .course-more-button[hidden],#lesson .course-next[hidden]{display:none}
#lesson .course-more{padding:36px 0 42px;display:flex;flex-direction:column;align-items:center;gap:20px;text-align:center}
#lesson .course-more-status{font-size:12px;line-height:1.8;color:#81766e}
#lesson .course-more-button{display:inline-flex;align-items:center;justify-content:center;gap:24px;max-width:100%;min-height:60px;padding:16px 28px;border:1px solid #796b60;border-radius:999px;background:#796b60;color:#fff;font-size:14px;font-weight:600;line-height:1.7;transition:background .2s,transform .2s}
#lesson .course-more-button:hover{background:#948174;transform:translateY(-2px)}
#lesson .course-more-button>span:last-child{font-size:18px;flex-shrink:0}
#lesson .course-next{display:inline-flex;align-items:center;justify-content:center;gap:14px;min-height:44px;color:#796b60;font-size:13px;text-decoration:underline;text-underline-offset:5px}
#lesson .course-next:hover{color:#4b4038}
#lesson .course-more-button:focus-visible,#lesson .course-next:focus-visible{outline:2px solid #ad8566;outline-offset:5px}
#lesson .course-card:focus{outline:none}
@media(max-width:700px){#lesson .course-more{padding:30px 0;gap:15px}#lesson .course-more-button{width:100%;padding:15px 16px;gap:12px;font-size:12px}#lesson .course-more-status{font-size:11px}}
@media(prefers-reduced-motion:reduce){#lesson .course-more-button{transition:none}}