/* CSE110 visual explainer notes: slide-like, but web-native */
.cse110-notes-shell{
  display:grid;
  gap:18px;
  min-width:0;
}
.cse110-notes-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) minmax(210px,280px);
  gap:18px;
  align-items:end;
  padding:18px 0 20px;
  border-bottom:2px solid var(--line);
}
.cse110-notes-head h1{
  margin:5px 0 4px;
  font-size:clamp(2rem,4vw,3.7rem);
  line-height:.95;
  letter-spacing:-.05em;
}
.cse110-notes-head p{
  margin:0;
  color:var(--muted);
  font-size:.95rem;
}
.cse110-back{
  align-self:start;
  padding:8px 10px;
  border:1.5px solid var(--line);
  border-radius:8px;
  background:var(--cream);
  color:var(--ink);
  cursor:pointer;
  font-size:.78rem;
  font-weight:800;
}
.cse110-head-progress{
  display:grid;
  gap:7px;
  min-width:0;
}
.cse110-head-progress b{
  font:700 .76rem "DM Mono",monospace;
  color:var(--muted);
}
.cse110-head-progress>span{
  display:block;
  height:10px;
  overflow:hidden;
  border:1.5px solid var(--line);
  border-radius:999px;
  background:var(--panel);
}
.cse110-head-progress i{
  display:block;
  width:0;
  height:100%;
  background:var(--yellow);
  transition:width .2s ease;
}

.cse110-note-layout{
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  gap:18px;
  align-items:start;
  min-width:0;
}
.cse110-topic-rail{
  display:grid;
  gap:7px;
  max-height:calc(100vh - 190px);
  overflow:auto;
  padding:2px 8px 8px 2px;
  position:sticky;
  top:0;
}
.cse110-topic-rail button{
  display:grid;
  grid-template-columns:36px minmax(0,1fr);
  gap:9px;
  align-items:center;
  padding:9px;
  border:1.5px solid var(--line);
  border-radius:9px;
  background:var(--panel);
  color:var(--ink);
  text-align:left;
  cursor:pointer;
}
.cse110-topic-rail button:hover{
  background:var(--yellow-soft);
}
.cse110-topic-rail button.active{
  background:var(--blue-soft);
  box-shadow:3px 3px 0 var(--line);
}
.cse110-topic-rail button>span{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border:1.5px solid var(--line);
  border-radius:8px;
  background:var(--yellow);
  color:#171319;
  font:800 .68rem "DM Mono",monospace;
}
.cse110-topic-rail b,
.cse110-topic-rail small{
  display:block;
}
.cse110-topic-rail b{
  font-size:.82rem;
  line-height:1.2;
}
.cse110-topic-rail small{
  margin-top:3px;
  color:var(--muted);
  font-size:.69rem;
  line-height:1.3;
}

.cse110-story-wrap{
  min-width:0;
}
.cse110-story-card{
  min-height:560px;
  display:grid;
  align-content:start;
  gap:18px;
  padding:clamp(22px,4vw,48px);
  border:2px solid var(--line);
  border-radius:20px;
  background:var(--paper);
  box-shadow:8px 8px 0 var(--line);
  overflow:hidden;
}
.cse110-story-card[data-scene-type="code"]{
  border-top:8px solid var(--blue);
}
.cse110-story-card[data-scene-type="check"]{
  border-top:8px solid var(--green);
}
.cse110-story-card[data-scene-type="story"]{
  border-top:8px solid var(--coral);
}
.cse110-scene-meta{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px;
  align-items:center;
}
.cse110-scene-meta span{
  font:800 .7rem "DM Mono",monospace;
  letter-spacing:.12em;
  color:var(--coral);
}
.cse110-scene-meta b{
  color:var(--muted);
  font-size:.76rem;
}
.cse110-story-card h2{
  max-width:900px;
  margin:0;
  font-size:clamp(2rem,4.4vw,4.4rem);
  line-height:.98;
  letter-spacing:-.055em;
}
.cse110-scene-body{
  max-width:920px;
  margin:0;
  color:var(--muted);
  font-size:clamp(1rem,1.5vw,1.18rem);
  line-height:1.7;
}

.cse110-visual-strip{
  display:flex;
  flex-wrap:wrap;
  gap:9px;
  align-items:center;
  padding:16px;
  border:2px solid var(--line);
  border-radius:13px;
  background:var(--cream);
}
.cse110-visual-strip>span{
  display:grid;
  grid-template-columns:30px minmax(0,1fr);
  gap:7px;
  align-items:center;
  min-width:130px;
  padding:9px 10px;
  border:1.5px solid var(--line);
  border-radius:9px;
  background:var(--panel);
}
.cse110-visual-strip b{
  display:grid;
  place-items:center;
  width:28px;
  height:28px;
  border-radius:50%;
  background:var(--yellow);
  color:#171319;
  font:800 .62rem "DM Mono",monospace;
}
.cse110-visual-strip em{
  min-width:0;
  font-size:.78rem;
  font-style:normal;
  font-weight:800;
  line-height:1.3;
}
.cse110-visual-strip>i{
  color:var(--coral);
  font-style:normal;
  font-weight:900;
}

.cse110-code{
  overflow:hidden;
  border:2px solid var(--line);
  border-radius:13px;
  background:#1d1a20;
  box-shadow:5px 5px 0 var(--line);
}
.cse110-code>div{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border-bottom:2px solid var(--line);
  background:var(--blue-soft);
  color:var(--ink);
}
.cse110-code>div>span{
  font:800 .65rem "DM Mono",monospace;
  letter-spacing:.08em;
}
.cse110-code button{
  padding:5px 8px;
  border:1px solid var(--line);
  border-radius:6px;
  background:var(--panel);
  color:var(--ink);
  cursor:pointer;
  font-size:.68rem;
  font-weight:800;
}
.cse110-code pre{
  margin:0;
  overflow:auto;
  padding:18px;
  color:#fff5dc;
  background:#1d1a20;
  font:.82rem/1.75 "DM Mono",monospace;
  tab-size:4;
}
.cse110-code code{
  border:0;
  padding:0;
  background:transparent;
  color:inherit;
  font:inherit;
}

.cse110-check{
  border:2px solid var(--line);
  border-radius:12px;
  background:var(--green-soft);
}
.cse110-check summary{
  padding:14px 16px;
  cursor:pointer;
  font-weight:800;
  line-height:1.45;
}
.cse110-check p{
  margin:0;
  padding:0 16px 16px;
  color:var(--muted);
  line-height:1.6;
}

.cse110-takeaway{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:12px;
  align-items:start;
  margin-top:auto;
  padding:14px 16px;
  border:2px solid var(--line);
  border-radius:12px;
  background:var(--yellow);
  color:#171319;
}
.cse110-takeaway span{
  padding-top:2px;
  font:800 .65rem "DM Mono",monospace;
  letter-spacing:.08em;
}
.cse110-takeaway p{
  margin:0;
  font-size:.92rem;
  font-weight:700;
  line-height:1.5;
}

.cse110-story-controls{
  display:grid;
  grid-template-columns:auto 1fr auto;
  gap:12px;
  align-items:center;
  margin-top:14px;
}
.cse110-story-controls>div{
  display:flex;
  gap:6px;
  align-items:center;
  justify-content:center;
  color:var(--muted);
  font-size:.72rem;
}
.cse110-story-controls kbd{
  min-width:25px;
  padding:3px 6px;
  border:1px solid var(--line);
  border-radius:5px;
  background:var(--cream);
  box-shadow:1px 1px 0 var(--line);
  color:var(--ink);
  text-align:center;
  font:700 .66rem "DM Mono",monospace;
}
.cse110-story-controls button:disabled{
  opacity:.35;
  cursor:default;
}

.dark .cse110-story-card{
  background:var(--panel);
}
.dark .cse110-takeaway{
  color:#171319;
}

@media(max-width:1100px){
  .cse110-notes-head{
    grid-template-columns:auto minmax(0,1fr);
  }
  .cse110-head-progress{
    grid-column:1/-1;
  }
  .cse110-note-layout{
    grid-template-columns:1fr;
  }
  .cse110-topic-rail{
    position:static;
    display:flex;
    max-height:none;
    overflow-x:auto;
    overflow-y:hidden;
    padding-bottom:8px;
  }
  .cse110-topic-rail button{
    flex:0 0 220px;
  }
}
@media(max-width:700px){
  .cse110-notes-head{
    grid-template-columns:1fr;
  }
  .cse110-back{
    justify-self:start;
  }
  .cse110-story-card{
    min-height:0;
    padding:20px 16px;
    border-radius:15px;
    box-shadow:5px 5px 0 var(--line);
  }
  .cse110-story-card h2{
    font-size:clamp(2rem,10vw,3.4rem);
  }
  .cse110-visual-strip{
    align-items:stretch;
  }
  .cse110-visual-strip>span{
    flex:1 1 140px;
  }
  .cse110-visual-strip>i{
    display:none;
  }
  .cse110-story-controls{
    grid-template-columns:1fr 1fr;
  }
  .cse110-story-controls>div{
    grid-column:1/-1;
    grid-row:1;
  }
  .cse110-story-controls button{
    width:100%;
  }
  .cse110-takeaway{
    grid-template-columns:1fr;
    gap:5px;
  }
}
@media(prefers-reduced-motion:reduce){
  .cse110-head-progress i{
    transition:none;
  }
}


/* CSE110 lifelong notes section */
.cse110-story-card[data-scene-type="life"]{
  border-top:8px solid var(--green);
  background:var(--panel);
}
.cse110-write-down{
  display:grid;
  gap:12px;
  padding:16px;
  border:2px solid var(--line);
  border-radius:13px;
  background:var(--yellow-soft);
  box-shadow:4px 4px 0 var(--line);
}
.cse110-write-down>div{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 12px;
}
.cse110-write-down>div span{
  padding:5px 8px;
  border:1.5px solid var(--line);
  border-radius:7px;
  background:var(--yellow);
  color:#171319;
  font:800 .66rem "DM Mono",monospace;
  letter-spacing:.06em;
}
.cse110-write-down>div b{
  font-size:.88rem;
}
.cse110-write-down ol{
  display:grid;
  gap:8px;
  margin:0;
  padding-left:22px;
}
.cse110-write-down li{
  padding-left:3px;
  color:var(--ink);
  font-size:.88rem;
  line-height:1.5;
}
.cse110-topic-rail button:last-child{
  border-color:var(--green);
}
.cse110-topic-rail button:last-child>span{
  background:var(--green);
  color:#fff;
}
.cse110-topic-rail button:last-child.active{
  background:var(--green-soft);
}
.dark .cse110-write-down{
  background:var(--yellow-soft);
}
.dark .cse110-write-down li,
.dark .cse110-write-down>div b{
  color:var(--ink);
}

@media(max-width:700px){
  .cse110-write-down{
    padding:13px;
  }
  .cse110-write-down li{
    font-size:.82rem;
  }
}


/* ===== CSE110 focus + landscape notes ===== */
.cse110-head-actions{
  display:grid;
  gap:8px;
  align-self:start;
}
.cse110-focus-toggle{
  padding:7px 9px;
  border:1.5px solid var(--line);
  border-radius:8px;
  background:var(--panel);
  color:var(--muted);
  cursor:pointer;
  font-size:.72rem;
  font-weight:800;
}
.cse110-focus-toggle:hover{
  background:var(--yellow-soft);
  color:var(--ink);
}

.cse110-landscape-grid{
  display:grid;
  grid-template-columns:minmax(300px,.82fr) minmax(420px,1.18fr);
  gap:24px;
  align-items:start;
  min-width:0;
}
.cse110-landscape-copy,
.cse110-landscape-media{
  min-width:0;
}
.cse110-landscape-copy{
  display:grid;
  align-content:start;
  gap:16px;
}
.cse110-landscape-media{
  display:grid;
  align-content:start;
  gap:16px;
}
.cse110-landscape-copy h2{
  font-size:clamp(1.8rem,3vw,3.25rem);
}
.cse110-landscape-media .cse110-code pre{
  max-height:360px;
}
.cse110-landscape-media .cse110-takeaway{
  margin-top:0;
}

/* Focus mode hides the global left rail and gives notes the full viewport width. */
.app.cse110-focus-mode{
  grid-template-columns:0 minmax(0,1fr);
}
.app.cse110-focus-mode .rail{
  display:none!important;
}
.app.cse110-focus-mode main{
  grid-column:1/-1;
}
.app.cse110-focus-mode #view-cse110notes{
  max-width:none;
}
.app.cse110-focus-mode #view-cse110notes .cse110-note-layout{
  grid-template-columns:220px minmax(0,1fr);
}
.app.cse110-focus-mode #view-cse110notes .cse110-story-card{
  min-height:calc(100vh - 250px);
}

@media(max-width:1180px){
  .cse110-landscape-grid{
    grid-template-columns:1fr;
  }
}
@media(max-width:1100px){
  .app.cse110-focus-mode #view-cse110notes .cse110-note-layout{
    grid-template-columns:1fr;
  }
}
@media(max-width:700px){
  .cse110-head-actions{
    display:flex;
    flex-wrap:wrap;
  }
  .cse110-landscape-grid{
    grid-template-columns:1fr;
    gap:16px;
  }
  .cse110-focus-toggle{
    display:none;
  }
}


/* ===== Dedicated CSE110 presentation page ===== */
/* CSE110 is a page of its own: the note is the primary surface. */
.app.cse110-presentation-mode{
  grid-template-columns:1fr;
  grid-template-rows:1fr;
}
.app.cse110-presentation-mode .topbar,
.app.cse110-presentation-mode .rail{
  display:none!important;
}
.app.cse110-presentation-mode main{
  grid-column:1;
  grid-row:1;
  width:100%;
  height:100vh;
  padding:18px 22px 28px;
  overflow:auto;
}
.app.cse110-presentation-mode #view-cse110notes{
  width:100%;
  max-width:none;
  margin:0;
}

.cse110-notes-head{
  grid-template-columns:auto minmax(0,1fr) minmax(180px,240px);
  align-items:center;
  padding:6px 0 12px;
  border-bottom:0;
}
.cse110-head-actions{
  display:flex;
  align-items:center;
  gap:8px;
}
.cse110-topics-toggle{
  padding:8px 11px;
  border:1.5px solid var(--line);
  border-radius:8px;
  background:var(--yellow);
  color:#171319;
  cursor:pointer;
  font-size:.75rem;
  font-weight:800;
}
.cse110-title-block h1{
  font-size:clamp(1.45rem,2.2vw,2.25rem);
  line-height:1;
}
.cse110-title-block p{
  font-size:.78rem;
}

.cse110-note-layout{
  display:block;
  position:relative;
}
.cse110-story-wrap{
  width:min(1500px,100%);
  margin:0 auto;
}
.cse110-story-card{
  min-height:calc(100vh - 165px);
  padding:clamp(24px,3vw,44px);
}
.cse110-landscape-grid{
  grid-template-columns:minmax(320px,.9fr) minmax(480px,1.1fr);
  gap:clamp(24px,3vw,48px);
}
.cse110-story-card h2,
.cse110-landscape-copy h2{
  font-size:clamp(2rem,3.5vw,4rem);
}

/* Topic list becomes an on-demand drawer, never permanent page chrome. */
.cse110-topic-drawer{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  z-index:220;
  width:min(360px,88vw);
  padding:18px 14px;
  background:var(--paper);
  border-right:2px solid var(--line);
  box-shadow:12px 0 35px #0003;
  transform:translateX(-105%);
  transition:transform .22s ease;
}
#cse110VisualNotes.topics-open .cse110-topic-drawer{
  transform:translateX(0);
}
.cse110-topic-drawer-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  margin-bottom:12px;
  padding:0 3px 10px;
  border-bottom:1.5px solid var(--line);
}
.cse110-topic-drawer-head b{
  font-size:1rem;
}
.cse110-topic-drawer-head button{
  width:34px;
  height:34px;
  border:1.5px solid var(--line);
  border-radius:8px;
  background:var(--panel);
  color:var(--ink);
  cursor:pointer;
  font-size:1.15rem;
}
.cse110-topic-drawer .cse110-topic-rail{
  position:static;
  display:grid;
  max-height:calc(100vh - 82px);
  overflow:auto;
  padding:0 6px 8px 0;
}
.cse110-topic-scrim{
  position:fixed;
  inset:0;
  z-index:210;
  display:none;
  border:0;
  background:#17131966;
}
#cse110VisualNotes.topics-open .cse110-topic-scrim{
  display:block;
}

@media(max-width:1180px){
  .cse110-landscape-grid{
    grid-template-columns:minmax(280px,.85fr) minmax(380px,1.15fr);
  }
}
@media(max-width:900px){
  .app.cse110-presentation-mode main{
    padding:12px 14px 22px;
  }
  .cse110-notes-head{
    grid-template-columns:1fr auto;
  }
  .cse110-title-block{
    grid-column:1/-1;
    grid-row:2;
  }
  .cse110-head-progress{
    grid-column:2;
    grid-row:1;
    min-width:140px;
  }
  .cse110-landscape-grid{
    grid-template-columns:1fr;
  }
  .cse110-story-card{
    min-height:0;
  }
}
@media(max-width:600px){
  .cse110-head-progress{
    display:none;
  }
  .cse110-notes-head{
    grid-template-columns:1fr;
  }
  .cse110-head-actions{
    justify-content:space-between;
  }
  .cse110-title-block{
    grid-column:1;
  }
}


/* ===== Student-friendly CSE110 learning redesign ===== */
.cse110-story-card{
  min-height:auto;
  display:block;
  padding:clamp(22px,3vw,38px);
  border-radius:18px;
  background:var(--paper);
  box-shadow:5px 5px 0 var(--line);
}

.cse110-learning-top{
  max-width:980px;
  margin:0 auto 24px;
}
.cse110-scene-meta{
  margin-bottom:10px;
}
.cse110-scene-meta span{
  font-size:.66rem;
  letter-spacing:.1em;
}
.cse110-scene-meta b{
  font-size:.7rem;
}
.cse110-learning-top h2{
  max-width:820px;
  margin:0 0 12px;
  font-size:clamp(1.9rem,3vw,3.25rem)!important;
  line-height:1.02;
  letter-spacing:-.04em;
}
.cse110-learning-top .cse110-scene-body{
  max-width:820px;
  margin:0;
  font-size:clamp(.98rem,1.2vw,1.08rem);
  line-height:1.65;
  color:var(--muted);
}

.cse110-learning-grid{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);
  gap:16px;
  align-items:start;
}
.cse110-learn-block{
  min-width:0;
  padding:16px;
  border:1.5px solid var(--line);
  border-radius:12px;
  background:var(--panel);
}
.cse110-block-label{
  display:block;
  margin-bottom:10px;
  font:800 .62rem "DM Mono",monospace;
  letter-spacing:.1em;
  color:var(--coral);
}
.cse110-example-block{
  grid-row:span 2;
}
.cse110-memory-block{
  border-left:5px solid var(--yellow);
  background:var(--yellow-soft);
}
.cse110-memory-block p{
  margin:0;
  color:var(--ink);
  font-size:.92rem;
  line-height:1.55;
  font-weight:700;
}
.cse110-check-block{
  border-left:5px solid var(--green);
}
.cse110-notes-block{
  grid-column:1/-1;
}
.cse110-empty-example{
  margin:0;
  color:var(--muted);
  font-size:.82rem;
}

.cse110-learning-grid .cse110-visual-strip{
  margin:0;
  padding:12px;
  gap:7px;
}
.cse110-learning-grid .cse110-visual-strip>span{
  min-width:0;
  flex:1 1 130px;
  padding:8px;
}
.cse110-learning-grid .cse110-visual-strip>i{
  font-size:.8rem;
}

.cse110-learning-grid .cse110-code{
  margin-top:12px;
  box-shadow:none;
}
.cse110-learning-grid .cse110-code pre{
  max-height:none;
  padding:14px;
  font-size:.78rem;
  line-height:1.65;
}
.cse110-learning-grid .cse110-code>div{
  padding:7px 10px;
}

.cse110-learning-grid .cse110-check{
  border:0;
  background:transparent;
}
.cse110-learning-grid .cse110-check summary{
  padding:0;
  font-size:.9rem;
  line-height:1.45;
}
.cse110-learning-grid .cse110-check p{
  margin-top:10px;
  padding:10px 12px;
  border-radius:8px;
  background:var(--green-soft);
  color:var(--ink);
}

.cse110-story-controls{
  position:sticky;
  bottom:8px;
  z-index:20;
  width:min(980px,calc(100% - 12px));
  margin:14px auto 0;
  padding:8px;
  border:1.5px solid var(--line);
  border-radius:12px;
  background:color-mix(in srgb,var(--paper) 94%,transparent);
  backdrop-filter:blur(8px);
  box-shadow:3px 3px 0 var(--line);
}
.cse110-story-controls button{
  min-height:40px;
}
.cse110-story-controls>div{
  font-size:.66rem;
}

.cse110-title-block h1{
  margin:3px 0 2px;
  font-size:clamp(1.25rem,1.8vw,1.85rem)!important;
}
.cse110-title-block p{
  display:none;
}

.dark .cse110-memory-block{
  background:#5f5319;
}
.dark .cse110-memory-block,
.dark .cse110-memory-block p{
  color:#fff8db!important;
}
.dark .cse110-learn-block{
  background:var(--panel);
}

@media(max-width:900px){
  .cse110-learning-grid{
    grid-template-columns:1fr;
  }
  .cse110-example-block{
    grid-row:auto;
  }
  .cse110-notes-block{
    grid-column:auto;
  }
}
@media(max-width:600px){
  .cse110-story-card{
    padding:16px;
  }
  .cse110-learning-top{
    margin-bottom:16px;
  }
  .cse110-learning-top h2{
    font-size:clamp(1.7rem,8vw,2.4rem)!important;
  }
  .cse110-story-controls{
    width:100%;
    grid-template-columns:1fr 1fr;
  }
  .cse110-story-controls>div{
    grid-column:1/-1;
  }
}


/* ===== Research-led CSE110 note system v3 ===== */
/*
  Design goals:
  - one learner-paced idea at a time;
  - clear signaling instead of decoration;
  - worked examples + subgoal labels for novices;
  - retrieval before answer reveal.
*/
.app.cse110-presentation-mode main{
  background:#f8f3e7;
}
.dark .app.cse110-presentation-mode main{
  background:#151217;
}

.cse110-notes-shell{
  gap:10px;
}
.cse110-notes-head{
  width:min(1280px,100%);
  margin:0 auto;
  grid-template-columns:auto minmax(0,1fr) minmax(190px,260px);
  padding:4px 0 10px;
}
.cse110-title-block{
  min-width:0;
}
.cse110-title-block .eyebrow{
  font-size:.58rem;
  letter-spacing:.1em;
  color:var(--muted);
}
.cse110-title-block h1{
  margin:2px 0!important;
  font-size:clamp(1.15rem,1.55vw,1.6rem)!important;
  letter-spacing:-.025em!important;
  line-height:1.05!important;
}
.cse110-title-block p{
  display:block;
  margin:0;
  font-size:.7rem;
  color:var(--muted);
}
.cse110-head-progress b{
  font-size:.62rem;
}
.cse110-head-progress>span{
  height:6px;
}
.cse110-story-wrap{
  width:min(1280px,100%);
}
.cse110-story-card{
  min-height:0!important;
  padding:0!important;
  overflow:visible;
  border:2px solid var(--line);
  border-top:0!important;
  border-radius:16px;
  background:var(--paper);
  box-shadow:4px 4px 0 var(--line);
}
.dark .cse110-story-card{
  background:var(--panel);
}

.cse110-lesson-map{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-bottom:1.5px solid var(--line);
  background:var(--panel);
  border-radius:14px 14px 0 0;
  overflow:hidden;
}
.cse110-lesson-map span{
  padding:8px 10px;
  border-right:1px solid color-mix(in srgb,var(--line) 45%,transparent);
  color:var(--muted);
  text-align:center;
  font:700 .62rem "DM Mono",monospace;
}
.cse110-lesson-map span:last-child{
  border-right:0;
}
.cse110-lesson-map span.active{
  background:var(--blue-soft);
  color:var(--ink);
}

.cse110-research-layout{
  display:grid;
  grid-template-columns:minmax(320px,.82fr) minmax(430px,1.18fr);
  grid-template-areas:
    "understand worked"
    "thinking thinking"
    "notes notes"
    "recall recall";
  gap:0;
}
.cse110-understand{
  grid-area:understand;
  padding:clamp(24px,3vw,40px);
  border-right:1.5px solid var(--line);
}
.cse110-worked{
  grid-area:worked;
  padding:clamp(20px,2.5vw,32px);
  background:color-mix(in srgb,var(--blue-soft) 45%,var(--paper));
}
.dark .cse110-worked{
  background:color-mix(in srgb,var(--blue-soft) 26%,var(--panel));
}
.cse110-thinking{
  grid-area:thinking;
  display:grid;
  grid-template-columns:minmax(180px,.35fr) minmax(0,1fr);
  gap:18px;
  align-items:center;
  padding:15px 20px;
  border-top:1.5px solid var(--line);
  background:var(--panel);
}
.cse110-note-taking{
  grid-area:notes;
  padding:16px 20px 0;
  border-top:1.5px solid var(--line);
}
.cse110-recall{
  grid-area:recall;
  padding:16px 20px 20px;
  border-top:1.5px solid var(--line);
}

.cse110-phase-label{
  display:block;
  margin-bottom:10px;
  color:var(--blue);
  font:800 .62rem "DM Mono",monospace;
  letter-spacing:.11em;
}
.cse110-understand .cse110-scene-meta{
  display:flex;
  justify-content:flex-start;
  gap:8px;
  margin:0 0 12px;
}
.cse110-understand .cse110-scene-meta span{
  color:var(--coral);
}
.cse110-understand .cse110-scene-meta b{
  padding-left:8px;
  border-left:1px solid var(--line);
}
.cse110-understand h2{
  max-width:680px;
  margin:0 0 14px;
  font-size:clamp(1.85rem,2.8vw,3.15rem)!important;
  line-height:1.02!important;
  letter-spacing:-.045em!important;
}
.cse110-understand .cse110-scene-body{
  max-width:650px;
  margin:0;
  font-size:clamp(.95rem,1.1vw,1.05rem);
  line-height:1.65;
}

.cse110-worked .cse110-visual-strip{
  margin:0 0 12px;
  padding:10px;
  border-width:1.5px;
  background:var(--paper);
}
.dark .cse110-worked .cse110-visual-strip{
  background:var(--panel);
}
.cse110-worked .cse110-code{
  margin:0;
  border-width:1.5px;
  box-shadow:none;
}
.cse110-worked .cse110-code pre{
  max-height:330px;
  padding:14px 16px;
  font-size:.76rem;
  line-height:1.6;
}
.cse110-explain-prompt{
  min-height:170px;
  display:grid;
  align-content:center;
  gap:7px;
  padding:22px;
  border:1.5px dashed var(--line);
  border-radius:11px;
  background:var(--paper);
}
.dark .cse110-explain-prompt{
  background:var(--panel);
}
.cse110-explain-prompt b{
  font-size:1rem;
}
.cse110-explain-prompt p{
  max-width:520px;
  margin:0;
  color:var(--muted);
  font-size:.82rem;
  line-height:1.5;
}

.cse110-thinking>div p{
  margin:3px 0 0;
  color:var(--muted);
  font-size:.72rem;
  line-height:1.4;
}
.cse110-thinking .cse110-phase-label{
  margin:0;
}
.cse110-subgoals{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.cse110-subgoals li{
  display:grid;
  grid-template-columns:28px minmax(0,1fr);
  gap:8px;
  align-items:center;
  min-height:48px;
  padding:8px 10px;
  border:1px solid var(--line);
  border-radius:9px;
  background:var(--paper);
}
.dark .cse110-subgoals li{
  background:var(--paper);
}
.cse110-subgoals span{
  display:grid;
  place-items:center;
  width:27px;
  height:27px;
  border-radius:50%;
  background:var(--yellow);
  color:#171319;
  font:800 .58rem "DM Mono",monospace;
}
.cse110-subgoals b{
  font-size:.72rem;
  line-height:1.3;
}

.cse110-retrieval{
  overflow:hidden;
  border:2px solid var(--green);
  border-radius:12px;
  background:var(--panel);
}
.cse110-retrieval summary{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:4px 14px;
  align-items:center;
  padding:14px 16px;
  cursor:pointer;
  list-style:none;
}
.cse110-retrieval summary::-webkit-details-marker{
  display:none;
}
.cse110-retrieval summary>span{
  grid-row:1/3;
  padding:6px 8px;
  border-radius:7px;
  background:var(--green);
  color:#fff;
  font:800 .58rem "DM Mono",monospace;
  letter-spacing:.06em;
}
.cse110-retrieval summary>b{
  font-size:.88rem;
  line-height:1.4;
}
.cse110-retrieval summary>small{
  color:var(--muted);
  font-size:.66rem;
}
.cse110-retrieval>div{
  padding:12px 16px 15px;
  border-top:1px solid var(--line);
  background:var(--green-soft);
}
.cse110-retrieval>div span{
  color:var(--green);
  font:800 .58rem "DM Mono",monospace;
  letter-spacing:.08em;
}
.cse110-retrieval>div p{
  margin:5px 0 0;
  color:var(--ink);
  font-size:.86rem;
  line-height:1.5;
  font-weight:700;
}
.dark .cse110-retrieval>div,
.dark .cse110-retrieval>div p{
  color:var(--ink);
}

.cse110-story-controls{
  position:sticky;
  bottom:8px;
  width:min(780px,calc(100% - 20px));
  margin:10px auto 0;
  padding:7px;
  border:1.5px solid var(--line);
  border-radius:11px;
  background:color-mix(in srgb,var(--paper) 94%,transparent);
  backdrop-filter:blur(10px);
  box-shadow:2px 2px 0 var(--line);
}
.cse110-story-controls button{
  min-height:38px;
  padding:8px 12px;
  font-size:.74rem;
}
.cse110-story-controls>div{
  font-size:.62rem;
}

@media(max-width:960px){
  .cse110-research-layout{
    grid-template-columns:1fr;
    grid-template-areas:"understand" "worked" "thinking" "notes" "recall";
  }
  .cse110-understand{
    border-right:0;
    border-bottom:1.5px solid var(--line);
  }
  .cse110-thinking{
    grid-template-columns:1fr;
  }
}
@media(max-width:700px){
  .app.cse110-presentation-mode main{
    padding:9px 10px 18px;
  }
  .cse110-notes-head{
    grid-template-columns:1fr auto;
  }
  .cse110-title-block{
    grid-column:1/-1;
  }
  .cse110-lesson-map{
    grid-template-columns:repeat(4,minmax(78px,1fr));
    overflow-x:auto;
  }
  .cse110-lesson-map span{
    min-width:78px;
    padding:7px 5px;
    font-size:.54rem;
  }
  .cse110-understand,
  .cse110-worked{
    padding:18px 16px;
  }
  .cse110-understand h2{
    font-size:clamp(1.65rem,8vw,2.35rem)!important;
  }
  .cse110-thinking,
  .cse110-recall,
  .cse110-note-taking{
    padding-left:14px;
    padding-right:14px;
  }
  .cse110-subgoals{
    grid-template-columns:1fr;
  }
  .cse110-story-controls>div{
    display:none;
  }
  .cse110-story-controls{
    grid-template-columns:1fr 1fr;
  }
}


/* Auto-hide CSE110 course header while reading */
.app.cse110-presentation-mode .cse110-notes-head{
  position:sticky;
  top:0;
  z-index:80;
  padding:12px 14px 14px;
  background:color-mix(in srgb,var(--paper) 96%,transparent);
  backdrop-filter:blur(10px);
  border:2px solid var(--line);
  border-radius:16px;
  box-shadow:4px 4px 0 var(--line);
  transform:translateY(0);
  opacity:1;
  transition:transform .22s ease,opacity .18s ease;
  will-change:transform;
}
.app.cse110-presentation-mode #cse110VisualNotes.cse110-header-hidden .cse110-notes-head{
  transform:translateY(calc(-100% - 18px));
  opacity:0;
  pointer-events:none;
}
@media(prefers-reduced-motion:reduce){
  .app.cse110-presentation-mode .cse110-notes-head{
    transition:none;
  }
}