/* Fablori for teachers: an exercise book, a graph page and a chalkboard.
   Theme = tokens below; layout = page classes. The engine's own selectors are not restyled. */

:root {
  --sc-canvas: #F3F5F0;
  --sc-surface: #FFFFFF;
  --sc-ink: #1A2850;
  --sc-ink-soft: #46557D;
  --sc-accent: #F2C230;
  --sc-accent-ink: #1A2850;
  --sc-font-display: "Lexend", system-ui, sans-serif;
  --sc-font-text: "Lexend", system-ui, sans-serif;
  --sc-shadow-color: 222 40% 22%;

  --hand: "Caveat", "Segoe Print", cursive;
  --pen: #2B4AA0;               /* handwriting in blue pen */
  --paper: #F7F8F3;
  --rule-c: #C9D6EA;
  --margin-c: #E4A6A6;
  --grid-c: rgba(64, 104, 176, 0.13);
  --board: #21443A;
  --board-deep: #1A382F;
  --chalk: #EEF2E8;
  --chalk-soft: #BFD0C4;

  --rule: 2rem;                 /* exercise-book line pitch */
  --ml: 7.5rem;                 /* margin column (left of the red line) */
  --zl: calc(var(--ml) + clamp(1.5rem, 3vw, 3rem));
  --card-w: 15.5rem;
  --zr: calc(var(--card-w) + 3rem);
  --r: 10px;
}

body { background: var(--sc-canvas); color: var(--sc-ink); font-weight: 360; }
:focus-visible { outline-color: var(--sc-ink); }
::selection { background: #F7DD7A; color: var(--sc-ink); }

.skip { position: fixed; left: 1rem; top: -4rem; z-index: 90; background: var(--sc-ink); color: #fff; padding: .6rem 1rem; border-radius: var(--r); }
.skip:focus { top: 1rem; }

/* ---------------------------------------------------------- grounds -- */
.paper-lined {
  background-color: var(--paper);
  background-image:
    linear-gradient(90deg, transparent calc(var(--ml) - 3px), var(--margin-c) calc(var(--ml) - 3px), var(--margin-c) calc(var(--ml) - 1.5px), transparent calc(var(--ml) - 1.5px), transparent calc(var(--ml) + 1.5px), var(--margin-c) calc(var(--ml) + 1.5px), var(--margin-c) calc(var(--ml) + 3px), transparent calc(var(--ml) + 3px)),
    repeating-linear-gradient(180deg, transparent 0 calc(var(--rule) - 1px), var(--rule-c) calc(var(--rule) - 1px) var(--rule));
}
.paper-graph {
  background-color: #F4F7F5;
  background-image:
    linear-gradient(var(--grid-c) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-c) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
}

.phase {
  position: absolute; left: 0; width: var(--ml); margin: 0;
  padding-right: 0.9rem; text-align: right;
  font-family: var(--hand); font-weight: 700; font-size: 1.7rem; line-height: 1;
  color: var(--pen); transform: rotate(-4deg); transform-origin: right center;
}

.zone { padding-left: var(--zl); padding-right: var(--zr); }
.h2 {
  font-family: var(--sc-font-display); font-weight: 600; margin: 0;
  font-size: clamp(2rem, 1.2rem + 2.4vw, 3.4rem); line-height: 1.08; letter-spacing: -0.025em;
  text-wrap: balance;
}
.lede { font-size: clamp(1.06rem, 1rem + 0.35vw, 1.3rem); line-height: 1.6; max-width: 54ch; color: var(--sc-ink-soft); margin: 0; text-wrap: pretty; }

/* ------------------------------------------------------------- chrome -- */
.bar {
  position: fixed; inset: 0 0 auto 0; z-index: 60;
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem 1.5rem; pointer-events: none;
}
.bar > * { pointer-events: auto; }
.bar.is-dark .mark { color: var(--chalk); }
.bar.is-dark .mark rect:nth-of-type(2) { fill: var(--chalk); }
.bar.is-dark .mark path { fill: #21443A; }
.mark { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none; font-weight: 600; font-size: 1.12rem; letter-spacing: -0.01em; color: var(--sc-ink); }
.bar__now, .bar__plan { display: none; }

.plan {
  position: fixed; z-index: 60; right: 1.5rem; top: 1.4rem; width: var(--card-w);
  transition: opacity 240ms var(--sc-ease-out), transform 240ms var(--sc-ease-out), visibility 0s linear 0s;
}
.plan.is-hidden { opacity: 0; transform: translateY(-10px) rotate(1.2deg); visibility: hidden; transition: opacity 200ms var(--sc-ease-out), transform 200ms var(--sc-ease-out), visibility 0s linear 200ms; }
.plan__card {
  position: relative; background-color: #FFFEFB;
  background-image:
    linear-gradient(180deg, transparent 3.05rem, #E39C9C 3.05rem, #E39C9C calc(3.05rem + 1.5px), transparent calc(3.05rem + 1.5px));
  border-radius: 4px; padding: .7rem 1rem 1rem;
  box-shadow: var(--sc-e2), 0 0 0 1px rgba(26, 40, 80, .06);
  transform: rotate(1.2deg);
}
.plan__card::before { /* drawing pin */
  content: ""; position: absolute; top: -7px; left: 50%; width: 14px; height: 14px; margin-left: -7px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #FFE79A, var(--sc-accent) 55%, #B98D0B);
  box-shadow: 0 2px 3px rgba(26, 40, 80, .35);
}
.plan__title { font-family: var(--hand); font-weight: 700; font-size: 1.85rem; line-height: 1.2; margin: 0 0 .35rem; color: var(--pen); }
.plan__aim, .plan__by { font-size: .8rem; line-height: 1.45; margin: 0; color: var(--sc-ink); padding: .32rem 0; border-bottom: 1px solid #D5E0EF; }
.plan__by { color: var(--sc-ink-soft); }
.plan__list { list-style: none; margin: 0; padding: 0; }
.plan__list li { border-bottom: 1px solid #D5E0EF; }
.plan__list a {
  display: flex; gap: .55rem; align-items: flex-start; text-decoration: none;
  font-size: .82rem; line-height: 1.3; padding: .42rem 0; min-height: 1.6rem; color: var(--sc-ink); border-radius: 4px;
}
.plan__list a:hover .obj { text-decoration: underline; text-underline-offset: .2em; }
.box { flex: none; width: 1rem; height: 1rem; margin-top: .06rem; border: 1.5px solid var(--sc-ink-soft); border-radius: 3px; background: #fff; position: relative; }
.box svg { position: absolute; inset: -4px -3px auto auto; width: 1.25rem; height: 1.25rem; overflow: visible; }
.box path { fill: none; stroke: var(--pen); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 24; stroke-dashoffset: 24; transition: stroke-dashoffset 320ms var(--sc-ease-out); }
.is-done .box path { stroke-dashoffset: 0; }
.is-done .obj { color: var(--sc-ink-soft); }
.obj { position: relative; z-index: 0; }
.obj::before {
  content: ""; position: absolute; z-index: -1; inset: .02em -.25em -.04em -.25em;
  background: color-mix(in oklab, var(--sc-accent) 72%, transparent); border-radius: 3px 9px 4px 10px;
  transform: scaleX(0); transform-origin: left center; transition: transform 340ms var(--sc-ease-out);
}
.is-current .obj::before { transform: scaleX(1); }
.is-current .obj { font-weight: 500; color: var(--sc-ink); }
.plan__cta {
  display: block; margin-top: .8rem; text-align: center; text-decoration: none; font-weight: 600; font-size: .86rem;
  background: var(--sc-ink); color: #fff; border-radius: 8px; padding: .62rem .7rem;
  transition: transform 140ms var(--sc-ease-out), background-color 160ms var(--sc-ease-out);
}
.plan__cta:hover { background: #24356A; }
.plan__cta:active { transform: translateY(1px); }

/* ------------------------------------------------------------ buttons -- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  min-height: 3rem; padding: .8rem 1.35rem; border: 0; border-radius: var(--r);
  font-weight: 600; font-size: 1rem; text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: transform 140ms var(--sc-ease-out), background-color 160ms var(--sc-ease-out), box-shadow 160ms var(--sc-ease-out);
}
.btn:active { transform: translateY(1px) scale(.985); }
.btn[disabled] { opacity: .6; cursor: progress; }
.btn--ink { background: var(--sc-ink); color: #fff; box-shadow: 0 2px 0 #0E1734, 0 6px 14px -6px rgba(26, 40, 80, .5); }
.btn--ink:hover { background: #24356A; }
.btn--chalk { background: var(--sc-accent); color: #1A2850; box-shadow: 0 3px 0 #A9850E, 0 10px 22px -8px rgba(0, 0, 0, .55); font-size: 1.08rem; min-height: 3.3rem; padding-inline: 1.6rem; }
.btn--chalk:hover { background: #F7CF4A; }
.btn--chalk:focus-visible { outline-color: var(--chalk); }

.pen-link {
  display: inline-flex; align-items: center; gap: .55rem; font-weight: 600; color: var(--sc-ink); text-decoration: none;
  border-bottom: 2px solid var(--sc-accent); padding-bottom: .1rem; line-height: 1.4;
}
.pen-link svg { width: 1.4rem; height: .7rem; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform 160ms var(--sc-ease-out); }
@media (hover: hover) and (pointer: fine) { .pen-link:hover svg { transform: translateX(3px); } }

/* --------------------------------------------------------------- HOOK -- */
.hook .phase { top: calc(var(--rule) * 7 + .3rem); }
.hook__light {
  position: absolute; inset: -10% 30% 30% -10%; pointer-events: none;
  background: radial-gradient(60% 60% at 30% 25%, rgba(255, 246, 214, .75), transparent 70%);
  transform: translate3d(calc(var(--sc-p, 0) * 6vw), calc(var(--sc-p, 0) * 4vh), 0);
}
.hook__copy, .hook__beat { position: absolute; left: var(--zl); top: calc(var(--rule) * 7 + .45rem); width: min(35rem, 42vw); z-index: 5; }
.hook h1 {
  margin: 0; font-weight: 600; letter-spacing: -0.03em; text-wrap: balance;
  font-size: clamp(2.4rem, 0.4rem + 3.3vw, 4.4rem); line-height: calc(var(--rule) * 2);
}
.hook__sub { margin: calc(var(--rule) * 1) 0 0; font-size: 1.15rem; line-height: var(--rule); max-width: 32rem; color: var(--sc-ink-soft); }
.hook__copy .pen-link { margin-top: var(--rule); }
.hook__beat-big { margin: 0; font-weight: 600; letter-spacing: -0.025em; font-size: clamp(2rem, .4rem + 2.6vw, 3.4rem); line-height: calc(var(--rule) * 2); text-wrap: balance; }
.hook__beat-small { margin: var(--rule) 0 0; font-size: 1.15rem; line-height: var(--rule); color: var(--sc-ink-soft); }

.desk { position: absolute; right: max(3vw, 2rem); top: 10vh; width: min(47vw, 54rem); aspect-ratio: 1.22; z-index: 3; }
.desk > div { position: absolute; }
.lean { transition: transform 600ms var(--sc-ease-out); }
.desk__slate { right: 0; top: 0; width: 90%; }
.desk__print { left: -2%; top: 69%; width: 47%; z-index: 2; }
.desk__pencil { left: 36%; top: 87%; width: 62%; z-index: 3; }
.slate { margin: 0; transform: rotate(-2.5deg); filter: drop-shadow(0 14px 18px rgba(26, 40, 80, .28)) drop-shadow(0 3px 4px rgba(26, 40, 80, .2)); }
.slate svg { width: 100%; height: auto; }
.print { margin: 0; position: relative; transform: rotate(3.5deg); background: #fff; padding: 3.2% 3.2% 9%; box-shadow: 0 2px 3px rgba(26, 40, 80, .18), 0 18px 30px -12px rgba(26, 40, 80, .38); }
.print img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.tape { position: absolute; width: 26%; height: 11%; background: rgba(250, 236, 170, .72); box-shadow: 0 1px 1px rgba(0, 0, 0, .06); }
.tape--a { left: -6%; top: -3%; transform: rotate(-24deg); }
.tape--b { right: -7%; top: -2%; transform: rotate(28deg); }
.pencil { width: 100%; height: auto; transform: rotate(-13deg); filter: drop-shadow(0 22px 14px rgba(26, 40, 80, .28)) drop-shadow(0 4px 3px rgba(26, 40, 80, .22)); }

/* ---------------------------------------------------------- THE IDEA -- */
.act--idea { position: relative; padding-block: calc(var(--rule) * 4) calc(var(--rule) * 4); }
.act--idea .phase { top: calc(var(--rule) * 4 + .4rem); }
.idea .lede { margin-top: var(--sc-5); }
.topic { margin-top: var(--sc-7) !important; max-width: 50rem; }
.topic__label { display: block; font-weight: 600; font-size: 1.05rem; margin-bottom: .6rem; }
.topic__row { display: flex; gap: .75rem; align-items: stretch; }
.topic textarea {
  flex: 1; min-width: 0; resize: vertical; min-height: 6.2rem;
  font: inherit; font-size: 1.08rem; line-height: 1.55; color: var(--sc-ink);
  background: #fff; border: 1.5px solid #9FB0CF; border-radius: var(--r); padding: .8rem 1rem;
  box-shadow: inset 0 2px 0 rgba(26, 40, 80, .04);
  transition: border-color 160ms var(--sc-ease-out), box-shadow 160ms var(--sc-ease-out);
}
.topic textarea:focus { outline: none; border-color: var(--sc-ink); box-shadow: 0 0 0 3px color-mix(in oklab, var(--sc-accent) 60%, transparent); }
.topic__row .btn { align-self: flex-end; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-top: 1rem; }
.chips__label { font-size: .9rem; color: var(--sc-ink-soft); margin-right: .2rem; }
.chip {
  border: 1.5px solid #B7C5DE; background: #fff; color: var(--sc-ink); border-radius: 999px; min-height: 2.4rem;
  padding: .35rem .9rem; font-size: .9rem; cursor: pointer;
  transition: border-color 140ms var(--sc-ease-out), background-color 140ms var(--sc-ease-out), transform 120ms var(--sc-ease-out);
}
.chip:hover { border-color: var(--sc-ink); }
.chip:active { transform: translateY(1px); }
.chip[disabled] { opacity: .55; cursor: progress; }
.topic__status { margin-top: 1rem; font-size: .92rem; color: var(--sc-ink-soft); min-height: 1.5em; }
.topic__status.is-warn { color: #8A3B12; }
.topic.is-busy .topic__status::before {
  content: ""; display: inline-block; width: .8em; height: .8em; margin-right: .5em; vertical-align: -.05em;
  border: 2px solid var(--sc-ink-soft); border-right-color: transparent; border-radius: 50%; animation: spin 700ms linear infinite;
}
@keyframes spin { to { transform: rotate(1turn); } }

/* ---------------------------------------------- THE IDEA, SEEN (PEAK) -- */
.slides .phase { top: 4.9rem; }
.slides__head { position: absolute; left: var(--zl); right: var(--zr); top: 4.4rem; z-index: 4; }
.slides__kicker { margin: 0 0 .35rem; font-size: .9rem; font-weight: 500; color: var(--sc-ink-soft); }
.slides__title { font-size: clamp(1.8rem, 1rem + 2vw, 2.9rem); }
.slides__meta { margin: .45rem 0 0; font-size: .95rem; color: var(--sc-ink-soft); }
.slides__from { margin: .2rem 0 0; font-size: .95rem; color: var(--sc-ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 62rem; }
.slides__from b { font-weight: 500; color: var(--sc-ink-soft); }
.slides__body {
  position: absolute; left: var(--zl); right: var(--zr); top: 15rem; bottom: 2.4rem;
  display: grid; grid-template-columns: minmax(0, 1fr) 12.5rem; grid-template-rows: auto 1fr; gap: 1.1rem 2rem; align-content: start;
}
.projector {
  position: relative; grid-column: 1; grid-row: 1;
  width: min(100%, calc((100svh - 24rem) * 16 / 9)); aspect-ratio: 16 / 9;
}
.slide {
  position: absolute; inset: 0; margin: 0; overflow: hidden; background: #0F1A33;
  border-radius: 6px; border: 7px solid #fff;
  box-shadow: 0 2px 3px rgba(26, 40, 80, .16), 0 22px 40px -16px rgba(26, 40, 80, .45);
  opacity: 0; will-change: transform, opacity;
}
.slide img { width: 100%; height: 100%; object-fit: cover; }
.slide__line {
  position: absolute; left: 4%; bottom: 7%; max-width: 80%;
  background: rgba(255, 255, 255, .94); color: var(--sc-ink); border-radius: 6px;
  padding: .45rem .8rem; font-weight: 600; font-size: clamp(1rem, .6rem + 1vw, 1.6rem); line-height: 1.2; letter-spacing: -0.015em;
  box-shadow: 0 6px 14px -6px rgba(0, 0, 0, .45);
}
.slide__n {
  position: absolute; left: 4%; top: 6%; background: var(--sc-accent); color: var(--sc-ink);
  font-size: .78rem; font-weight: 600; padding: .2rem .55rem; border-radius: 4px;
}
.say { position: relative; grid-column: 1; grid-row: 2; min-height: 6.5rem; max-width: 46rem; }
.say__line { position: absolute; inset: 0 auto auto 0; margin: 0; opacity: 0; }
.say__who { display: block; font-size: .78rem; font-weight: 600; color: var(--sc-ink-soft); text-transform: uppercase; letter-spacing: .08em; margin-bottom: .2rem; }
.say__text { display: block; font-size: clamp(1.08rem, .9rem + .55vw, 1.4rem); line-height: 1.45; font-weight: 400; }
.say__credit { display: block; margin-top: .45rem; font-size: .8rem; color: var(--sc-ink-soft); }
.say__credit a { color: inherit; }
.thumbs { grid-column: 2; grid-row: 1 / span 2; list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .8rem; }
.thumb { display: grid; grid-template-columns: 1fr; gap: .3rem; opacity: .35; transform: scale(.96); transform-origin: left top; transition: opacity 260ms var(--sc-ease-out), transform 260ms var(--sc-ease-out); }
.thumb__img { position: relative; aspect-ratio: 16 / 9; border: 4px solid #fff; border-radius: 4px; overflow: hidden; background: #DCE4EF; box-shadow: 0 6px 12px -8px rgba(26, 40, 80, .5); }
.thumb__img img { width: 100%; height: 100%; object-fit: cover; }
.thumb__cap { font-size: .78rem; line-height: 1.3; color: var(--sc-ink-soft); display: flex; justify-content: space-between; gap: .5rem; }
.thumb__cap b { font-weight: 500; color: var(--sc-ink); }
.thumb.is-on { opacity: 1; transform: none; }
.thumb.is-current .thumb__img { outline: 3px solid var(--sc-accent); outline-offset: 2px; }
.thumbs.is-many { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; align-content: start; }
.slides__note { position: absolute; right: var(--zr); bottom: 1.4rem; margin: 0; max-width: 30rem; font-family: var(--hand); font-size: 1.45rem; line-height: 1.15; color: var(--pen); text-align: right; transform: rotate(-1.5deg); }

/* ------------------------------------------------------------ EXAMPLE -- */
.act--example { position: relative; padding-block: calc(var(--rule) * 4) calc(var(--rule) * 5); }
.act--example .phase { top: calc(var(--rule) * 4 + .4rem); }
.ex { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr); gap: 3rem; align-items: start; }
.ex .h2 { font-size: clamp(2rem, 1.1rem + 1.7vw, 2.9rem); }
.ex__text .lede { margin-top: var(--sc-5); }
.brief { margin: var(--sc-6) 0 0 !important; }
.brief figcaption { font-weight: 600; font-size: .95rem; margin-bottom: .5rem; }
.brief blockquote {
  margin: 0; font-size: 1.02rem; line-height: var(--rule); color: var(--sc-ink);
  background: rgba(255, 255, 255, .7); border-radius: 4px; padding: 0 1rem; box-shadow: inset 0 0 0 1px #D4DEEC;
}
mark { background: linear-gradient(100deg, transparent .1em, color-mix(in oklab, var(--sc-accent) 80%, transparent) .2em, color-mix(in oklab, var(--sc-accent) 70%, transparent) 96%, transparent); color: inherit; padding: 0 .12em; border-radius: 3px; }
.ex__film { margin: calc(var(--rule) * .5) 0 0; }
.ex__frame { background: #fff; padding: .55rem; border-radius: 6px; transform: rotate(-1deg); box-shadow: 0 2px 3px rgba(26, 40, 80, .16), 0 26px 44px -20px rgba(26, 40, 80, .5); }
.ex__frame video { width: 100%; height: auto; aspect-ratio: 16 / 9; background: #0F1A33; border-radius: 3px; }
.ex__film figcaption { display: flex; flex-wrap: wrap; gap: .25rem 1rem; align-items: baseline; margin-top: 1.1rem; font-size: .92rem; color: var(--sc-ink-soft); }
.ex__film figcaption b { color: var(--sc-ink); font-weight: 600; }
.ex__film figcaption a { margin-left: auto; color: var(--sc-ink); }

/* -------------------------------------------------------------- CHECK -- */
.check .phase { top: calc(max(5rem, 13vh) + .6rem); }
.check__grid { position: absolute; left: var(--zl); right: var(--zr); top: max(5rem, 13vh); bottom: 2rem; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(16rem, .75fr); gap: 2.5rem; align-content: start; }
.check__lead { margin: .9rem 0 0; color: var(--sc-ink-soft); max-width: 48ch; }
.marks { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; gap: .6rem; }
.mark-row {
  position: relative; display: grid; grid-template-columns: 1.6rem 5.6rem minmax(0, 1fr) auto; gap: .9rem; align-items: center;
  background: #fff; border-radius: 8px; padding: .55rem .6rem .55rem .8rem;
  box-shadow: 0 1px 0 #D3DCEA, 0 8px 16px -12px rgba(26, 40, 80, .45);
  transition: opacity 220ms var(--sc-ease-out);
}
.mark-row__n { font-weight: 600; font-size: 1.1rem; color: var(--pen); font-family: var(--hand); font-size: 1.6rem; line-height: 1; text-align: center; }
.mark-row__img { aspect-ratio: 16 / 9; border-radius: 4px; overflow: hidden; background: #DCE4EF; }
.mark-row__img img { width: 100%; height: 100%; object-fit: cover; }
.mark-row__t { min-width: 0; }
.mark-row__t b { display: block; font-weight: 600; font-size: .98rem; line-height: 1.3; }
.mark-row__t span { display: block; font-size: .86rem; line-height: 1.4; color: var(--sc-ink-soft); overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.mark-row__ctl { display: flex; gap: .3rem; }
.ctl {
  width: 2.5rem; height: 2.5rem; display: grid; place-items: center; border-radius: 8px; border: 1.5px solid #C4D0E4; background: #fff; color: var(--sc-ink); cursor: pointer;
  transition: border-color 140ms var(--sc-ease-out), background-color 140ms var(--sc-ease-out), transform 120ms var(--sc-ease-out);
}
.ctl svg { width: 1.1rem; height: 1.1rem; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.ctl:hover:not([disabled]) { border-color: var(--sc-ink); }
.ctl:active:not([disabled]) { transform: translateY(1px); }
.ctl[disabled] { opacity: .35; cursor: default; }
.ctl--x:hover:not([disabled]) { background: #FFF6D6; }
.strike { position: absolute; left: 2.6rem; right: 8.8rem; top: 50%; height: 3px; margin-top: -1px; background: var(--pen); border-radius: 3px; transform: scaleX(0) rotate(-1.2deg); transform-origin: left center; transition: transform 300ms var(--sc-ease-out); pointer-events: none; }
.mark-row.is-out { opacity: .62; }
.mark-row.is-out .strike { transform: scaleX(1) rotate(-1.2deg); }
.mark-row.is-out .mark-row__img { filter: grayscale(1); }
.check__try { margin: 1rem 0 0; font-family: var(--hand); font-size: 1.55rem; color: var(--pen); transform: rotate(-1.5deg); transform-origin: left; }
.handin {
  align-self: start; margin-top: .4rem; background: #FFFEF8; border-radius: 4px; padding: 1.2rem 1.3rem 1.3rem;
  box-shadow: 0 2px 3px rgba(26, 40, 80, .12), 0 20px 34px -18px rgba(26, 40, 80, .45); transform: rotate(.8deg);
}
.handin h3 { margin: 0 0 .7rem; font-size: 1.05rem; font-weight: 600; }
.handin__brief { margin: 0; font-size: .88rem; line-height: 1.6; color: var(--sc-ink); max-height: 19rem; overflow: auto; padding: .7rem .85rem; background: #F1F5FB; border-radius: 6px; }
.handin__time { margin: .9rem 0 0; font-size: .9rem; font-weight: 500; }
.handin__note { margin: .5rem 0 0; font-size: .82rem; line-height: 1.5; color: var(--sc-ink-soft); }

/* -------------------------------------------------------------- RECAP -- */
.recap .phase { top: 5.6rem; }
.rail-window { position: absolute; top: 0; bottom: 0; left: 0; right: calc(var(--zr) - 1.5rem); overflow: clip; }
.rail { height: 100%; align-items: center; gap: 2rem; padding-left: var(--zl); padding-right: calc(var(--zr) + 2rem); }
.rail__lead { flex: none; width: 22rem; }
.rail__lead p { margin: 1rem 0 0; color: var(--sc-ink-soft); max-width: 30ch; }
.rail__end { flex: none; width: 14rem; }
.flash { flex: none; width: 19rem; height: 14.5rem; perspective: 1100px; }
.flash__in { position: relative; width: 100%; height: 100%; transform-style: preserve-3d; transform: rotateY(calc(var(--f, 0) * 180deg)); will-change: transform; }
.flash__q, .flash__a {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: 6px; padding: 1.2rem 1.4rem; display: flex; flex-direction: column; justify-content: center; gap: .6rem;
  box-shadow: 0 2px 3px rgba(26, 40, 80, .14), 0 18px 30px -16px rgba(26, 40, 80, .45);
}
.flash__q { background: #fff; background-image: linear-gradient(180deg, transparent 2.6rem, #E39C9C 2.6rem, #E39C9C calc(2.6rem + 1.5px), transparent calc(2.6rem + 1.5px)); }
.flash__a { background: var(--sc-ink); color: #F2F4FA; transform: rotateY(180deg); }
.flash span { position: absolute; top: .7rem; left: 1.1rem; font-family: var(--hand); font-weight: 700; font-size: 1.6rem; line-height: 1; color: var(--pen); }
.flash__a span { color: var(--sc-accent); }
.flash h3 { margin: 0; font-size: 1.45rem; line-height: 1.2; font-weight: 600; letter-spacing: -0.02em; }
.flash p { margin: 0; font-size: 1.02rem; line-height: 1.5; }
.flash__a .flash__echo { margin: 0 0 .1rem; font-size: .84rem; font-weight: 500; color: #B6C1DE; }

/* ----------------------------------------------------------- HOMEWORK -- */
.board {
  background-color: var(--board); color: var(--chalk);
  background-image:
    radial-gradient(40% 30% at 22% 30%, rgba(238, 242, 232, .07), transparent 70%),
    radial-gradient(35% 28% at 78% 62%, rgba(238, 242, 232, .05), transparent 70%),
    radial-gradient(120% 90% at 50% 40%, transparent 55%, rgba(0, 0, 0, .25));
  border-top: 14px solid #8B6239; box-shadow: inset 0 6px 0 #A57A4C;
  --sc-ink: var(--chalk); --sc-ink-soft: var(--chalk-soft);
}
.board__inner { position: absolute; left: var(--zl); right: var(--zr); top: 12vh; }
.chalk-h { margin: 0; font-family: var(--hand); font-weight: 700; font-size: clamp(3.4rem, 2rem + 4vw, 6rem); line-height: 1; color: var(--chalk); text-shadow: 0 0 1px rgba(238, 242, 232, .6); transform: rotate(-2deg); transform-origin: left; }
.chalk-list { margin: 2.2rem 0 0; padding-left: 2.2rem; font-family: var(--hand); font-weight: 500; font-size: clamp(1.55rem, 1.1rem + 1.1vw, 2.15rem); line-height: 1.3; max-width: 46rem; }
.chalk-list li { padding-left: .3rem; margin-top: .55rem; }
.chalk-list li::marker { font-weight: 700; color: var(--sc-accent); }
.chalk-topic { color: #FFF3C2; }
.tray { margin-top: 2.6rem; display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.6rem; }
.tray__small { margin: 0; max-width: 34rem; font-size: .92rem; line-height: 1.55; color: var(--chalk-soft); }
.tray__small a { color: var(--chalk); }
.foot {
  position: absolute; left: var(--zl); right: var(--zr); bottom: 1.6rem;
  display: flex; flex-wrap: wrap; gap: .6rem 2rem; align-items: center;
  border-top: 1px solid rgba(238, 242, 232, .18); padding-top: 1rem; font-size: .84rem; color: var(--chalk-soft);
}
.foot a { color: var(--chalk-soft); text-decoration: none; }
.foot a:hover { color: var(--chalk); text-decoration: underline; }
.foot a[aria-current] { color: var(--chalk); }
.foot__mark { display: inline-flex; align-items: center; gap: .45rem; font-weight: 600; color: var(--chalk) !important; }
.foot__nav, .foot__for { display: flex; flex-wrap: wrap; gap: .3rem 1rem; align-items: center; }
.foot__for span { color: var(--chalk-soft); }
.board :focus-visible { outline-color: var(--sc-accent); }

/* ------------------------------------------------------- mid widths -- */
@media (max-width: 1099px) {
  :root { --ml: 4.6rem; --zr: var(--sc-gutter); }
  .phase { font-size: 1.35rem; padding-right: .6rem; }
  .bar { background: color-mix(in oklab, var(--paper) 94%, transparent); backdrop-filter: none; border-bottom: 1px solid #DCE3EE; padding: .55rem .9rem; height: 3.4rem; }
  .bar__now { display: block; flex: 1; min-width: 0; margin: 0; font-size: .85rem; color: var(--sc-ink-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; text-align: center; }
  .bar__now::before { content: ""; display: inline-block; width: .55rem; height: .55rem; margin-right: .45rem; border-radius: 2px; background: var(--sc-accent); vertical-align: .05em; }
  .bar__plan { display: inline-flex; align-items: center; min-height: 2.5rem; padding: .3rem .85rem; border-radius: 8px; border: 1.5px solid #B7C5DE; background: #fff; font-size: .85rem; font-weight: 500; cursor: pointer; color: var(--sc-ink); }
  .bar__plan[aria-expanded="true"] { border-color: var(--sc-ink); }
  .plan { top: 3.9rem; right: .8rem; width: min(19rem, calc(100vw - 1.6rem)); }
  .plan:not(.is-open) { opacity: 0; transform: translateY(-8px); visibility: hidden; pointer-events: none; }
  .plan.is-hidden.is-open { opacity: 1; visibility: visible; transform: none; }
  .hook__copy, .hook__beat { top: calc(var(--rule) * 4 + .45rem); width: min(32rem, 52vw); }
  .hook .phase { top: calc(var(--rule) * 4 + .3rem); }
  .desk { width: 46vw; top: 18vh; }
  .ex { grid-template-columns: 1fr; gap: 2.4rem; }
}

/* ------------------------------------------------------------ phones -- */
@media (max-width: 759px) {
  :root { --rule: 1.5rem; --ml: 1.6rem; --zl: 2.6rem; --zr: 1rem; }
  .phase { display: none; }
  .bar__now { text-align: left; }
  .hook__copy, .hook__beat { top: calc(3.4rem + var(--rule) * 2 + .3rem); left: var(--zl); right: var(--zr); width: auto; }
  .hook h1 { font-size: clamp(2rem, 1.1rem + 4.4vw, 2.5rem); line-height: calc(var(--rule) * 2); letter-spacing: -0.03em; }
  .hook__sub { font-size: 1rem; line-height: var(--rule); margin-top: var(--rule); }
  .hook__beat-big { font-size: 1.85rem; line-height: calc(var(--rule) * 2); }
  .hook__beat-small { font-size: 1rem; line-height: var(--rule); }
  .desk { left: auto; right: 4vw; top: auto; bottom: 15svh; width: 88vw; }
  .desk__print { top: 76%; width: 48%; }
  .desk__pencil { left: 40%; top: 97%; width: 62%; }

  .act--idea, .act--example { padding-block: calc(var(--rule) * 3) calc(var(--rule) * 4); }
  .topic__row { flex-direction: column; }
  .topic__row .btn { align-self: stretch; }

  .slides__head { top: 4.3rem; }
  .slides__kicker { font-size: .82rem; margin-bottom: .15rem; }
  .slides__title { font-size: 1.6rem; }
  .slides__meta { font-size: .85rem; margin-top: .25rem; }
  .slides__from { font-size: .85rem; }
  .slides__body { top: 13rem; bottom: 1rem; grid-template-columns: 1fr; grid-template-rows: auto auto auto; gap: .9rem; }
  .projector { width: 100%; }
  .slide { border-width: 5px; }
  .slide__line { font-size: 1rem; padding: .35rem .6rem; }
  .say { grid-row: 2; min-height: 7.6rem; }
  .say__text { font-size: 1.05rem; }
  .thumbs, .thumbs.is-many { grid-column: 1; grid-row: 3; flex-direction: row; display: flex; gap: .5rem; }
  .thumb { flex: 1; min-width: 0; }
  .thumb__cap { display: none; }
  .slides__note { left: var(--zl); right: var(--zr); bottom: .8rem; font-size: 1.15rem; text-align: left; max-width: none; }

  .check__grid { top: 4.4rem; bottom: .8rem; grid-template-columns: 1fr; gap: .9rem; }
  .check .h2 { font-size: 1.6rem; }
  .check__lead { font-size: .9rem; margin-top: .5rem; line-height: 1.5; }
  .marks { margin-top: .8rem; gap: .45rem; }
  .mark-row { grid-template-columns: 1.1rem 3.6rem minmax(0, 1fr) auto; gap: .5rem; padding: .4rem .45rem .4rem .5rem; }
  .mark-row__n { font-size: 1.3rem; }
  .mark-row__t b { font-size: .86rem; }
  .mark-row__t span { display: none; }
  .ctl { width: 2.3rem; height: 2.3rem; }
  .mark-row__ctl { gap: .2rem; }
  .strike { left: 1.8rem; right: 7.6rem; }
  .check__try { font-size: 1.2rem; margin-top: .5rem; }
  .handin { margin-top: 0; padding: .8rem .9rem .9rem; transform: none; }
  .handin h3 { font-size: .92rem; margin-bottom: .3rem; }
  .handin__brief { font-size: .8rem; line-height: 1.35rem; max-height: calc(1.35rem * 5); }
  .handin__time { font-size: .82rem; margin-top: .4rem; }
  .handin__note { display: none; }

  .rail { gap: 1rem; padding-right: 1.5rem; }
  .rail__lead { width: 78vw; }
  .flash { width: 78vw; height: 13.5rem; }
  .rail__end { width: 50vw; }

  .board { border-top-width: 10px; }
  .board__inner { top: 8svh; }
  .chalk-list { margin-top: 1.2rem; padding-left: 1.6rem; font-size: 1.45rem; line-height: 1.25; }
  .tray { margin-top: 1.6rem; }
  .tray .btn { width: 100%; }
  .tray__small { font-size: .82rem; }
  .foot { bottom: .9rem; gap: .4rem 1rem; font-size: .76rem; padding-top: .7rem; }
}

/* ---------------------------------------------------- reduced motion -- */
@media (prefers-reduced-motion: reduce) {
  .lean, .hook__light { transform: none !important; }
  .flash { height: auto; perspective: none; }
  .flash__in { transform: none !important; display: grid; gap: .4rem; }
  .flash__q, .flash__a { position: relative; inset: auto; transform: none; backface-visibility: visible; min-height: 6.2rem; }
  .slide, .say__line { transition: opacity 200ms linear; }
}