/* Plato Pocket — the mobile layer over praxis.css.
 *
 * praxis.css is a print and desktop document system: it has no breakpoints and
 * its grids are fixed columns. Everything phone-shaped lives here, and nothing
 * here redefines a design-system token.
 *
 * House rule from praxis-design-system/SKILL.md: no animations, gradients or
 * drop shadows, and "this brand doesn't pop". Points and streaks are markup and
 * copy, not effects. Flat amber, no glow, no confetti, no exclamation marks.
 */

:root {
  --plato-ink:    #1F1F1F;
  --plato-cloth:  #FFFFFF;
  --plato-shade:  #E4DFD6;
  --plato-amber:  hsl(var(--primary));
  --plato-skin:   #E8C9A4;
  --plato-muzzle: #C6A279;
  --plato-beard:  #CECAC5;
  --plato-hair:   #928D87;

  --app-w: 430px;
  --tap: 44px;
}

@media (prefers-color-scheme: dark) {
  :root:not(.light) {
    --plato-ink:   #14100D;
    --plato-shade: #D4CEC4;
    --plato-muzzle: #B08F6A;
    --plato-hair:  #7C7770;
  }
}

html, body { height: 100%; }
body {
  margin: 0;
  background: hsl(var(--muted));
  display: flex;
  flex-direction: column;
  align-items: center;
  overscroll-behavior: contain;
}

/* ---- the app frame ------------------------------------------------------ */
.app {
  width: 100%;
  max-width: var(--app-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  background: hsl(var(--background));
  position: relative;
  overflow: hidden;
}
@media (min-width: 480px) {
  body { padding: var(--space-6) 0; }
  .app {
    height: min(900px, calc(100vh - 6rem));
    flex: 0 0 auto;
    border: 1px solid hsl(var(--border));
    border-radius: var(--radius-xl);
  }
}

/* ---- top chrome --------------------------------------------------------- */
.bar {
  flex: 0 0 auto;
  padding: calc(var(--space-4) + env(safe-area-inset-top)) var(--space-5) var(--space-3);
  border-bottom: 1px solid hsl(var(--border));
}
.bar-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-3);
  font-size: var(--text-xs); letter-spacing: var(--tracking-wider);
  text-transform: uppercase; color: hsl(var(--muted-foreground));
}
.bar-row b {
  color: hsl(var(--foreground)); font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
}
/* Course names run to "AI Fluency: Framework and Foundations", which wraps the
   row onto three lines and squeezes the score. The name gives way; the score
   and the back control keep their space. */
#bar-left {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0;
}
#bar-right { flex: 0 0 auto; white-space: nowrap; }
.bar-back { flex: 0 0 auto; white-space: nowrap; }
.bar-back {
  background: none; border: 0; padding: 0; cursor: pointer;
  font: inherit; color: inherit; letter-spacing: inherit;
  text-transform: inherit;
}
.bar-title {
  margin: var(--space-2) 0;
  font-family: var(--font-display); font-weight: var(--weight-bold);
  font-size: var(--text-base); letter-spacing: var(--tracking-tight);
}
.track { height: 4px; background: hsl(var(--muted)); border-radius: 2px; overflow: hidden; }
.track i { display: block; width: 0; height: 100%; background: hsl(var(--primary)); }

/* ---- scrolling body ----------------------------------------------------- */
.screen {
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-5) var(--space-5) var(--space-6);
}
.foot {
  flex: 0 0 auto;
  padding: var(--space-4) var(--space-5) calc(var(--space-4) + env(safe-area-inset-bottom));
  border-top: 1px solid hsl(var(--border));
}
.foot:empty { display: none; }

/* ---- Plato -------------------------------------------------------------- */
.plato { width: 62px; flex: 0 0 62px; }
.plato svg { width: 100%; height: auto; display: block; }
.plato-lg { width: 108px; flex: 0 0 108px; margin: 0 auto var(--space-4); }

.speech { display: flex; gap: var(--space-4); align-items: center; margin-bottom: var(--space-5); }
.speech .said { flex: 1; min-width: 0; }
.speech h2 {
  font-size: var(--text-xl); line-height: var(--leading-tight);
  margin: 0 0 var(--space-2); letter-spacing: var(--tracking-tight);
  text-wrap: balance;
}
.speech h2:last-child { margin-bottom: 0; }
.speech p { margin: 0; font-size: var(--text-sm); color: hsl(var(--muted-foreground)); }

.teach { font-size: var(--text-base); line-height: var(--leading-relaxed); margin: 0 0 var(--space-5); }

/* ---- buttons ------------------------------------------------------------ */
.btn-lg {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; min-height: var(--tap);
  padding: var(--space-3) var(--space-5);
  border: 0; border-radius: var(--radius);
  background: hsl(var(--foreground)); color: hsl(var(--background));
  font-family: var(--font-sans); font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  cursor: pointer;
}
.btn-lg[disabled] { opacity: .4; cursor: default; }
.btn-lg .arr { opacity: .6; }

.opt {
  display: block; width: 100%; text-align: left;
  min-height: var(--tap);
  margin-bottom: var(--space-3);
  padding: var(--space-4);
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  font-family: var(--font-sans); font-size: var(--text-sm);
  line-height: var(--leading-snug); color: hsl(var(--foreground));
  cursor: pointer;
}
/* The option they chose is marked as theirs, not as wrong, and the correct
   answer stays hidden: the question gets re-offered, so revealing it here would
   end the thinking rather than restart it. */
.opt.picked {
  border-color: hsl(var(--muted-foreground));
  background: hsl(var(--muted));
  color: hsl(var(--muted-foreground));
}
.opt.ok { border-color: hsl(var(--primary)); border-width: 2px; padding: calc(var(--space-4) - 1px); }
.opt[disabled] { cursor: default; }
.opt .k {
  display: inline-block; width: 1.4em;
  font-weight: var(--weight-bold); color: hsl(var(--muted-foreground));
}

.q { font-size: var(--text-lg); line-height: var(--leading-snug); margin: 0 0 var(--space-5); text-wrap: balance; }

:where(button, a, textarea):focus-visible {
  outline: 2px solid hsl(var(--primary));
  outline-offset: 2px;
}

/* ---- diagram ------------------------------------------------------------ */
/* House rule: diagram content is centred in the viewBox. A pair of boxes set
   symmetrically about the centre line counts as centred and stays put; a lone
   element does not, and gets moved. */
.diagram { margin: 0 0 var(--space-5); overflow-x: auto; }
.diagram svg { width: 100%; height: auto; display: block; }
.box       { fill: hsl(var(--card));       stroke: hsl(var(--border));  stroke-width: 1.5; }
.box-amber { fill: hsl(var(--card));       stroke: hsl(var(--primary)); stroke-width: 2; }
.box-ink   { fill: hsl(var(--foreground)); }
.t-band { font: 600 10px var(--font-sans); letter-spacing: .09em; fill: hsl(var(--muted-foreground)); text-transform: uppercase; }
.t-lbl  { font: 600 14px var(--font-sans); fill: hsl(var(--foreground)); }
.t-sub  { font: 400 12px var(--font-sans); fill: hsl(var(--muted-foreground)); }
.t-tiny { font: 400 11px var(--font-sans); fill: hsl(var(--muted-foreground)); }
.t-mono { font: 400 12px var(--font-mono); fill: hsl(var(--foreground)); }
.t-white{ font: 600 13px var(--font-sans); fill: hsl(var(--background)); }
.l-ink   { stroke: hsl(var(--foreground)); fill: none; }
.l-amber { stroke: hsl(var(--primary));    fill: none; }
.l-faint { stroke: hsl(var(--border));     fill: none; }
.s-ink   { fill: hsl(var(--foreground)); }
.s-amber { fill: hsl(var(--primary)); }
.s-muted { fill: hsl(var(--muted-foreground)); }

/* ---- video card --------------------------------------------------------- */
.video {
  display: flex; align-items: center; gap: var(--space-3);
  min-height: var(--tap);
  padding: var(--space-3) var(--space-4);
  border: 1px solid hsl(var(--border)); border-left: 3px solid hsl(var(--primary));
  border-radius: var(--radius-sm);
  text-decoration: none; color: inherit;
  margin-bottom: var(--space-5);
}
.video .play {
  flex: 0 0 auto; width: 22px; height: 22px; border-radius: 50%;
  background: hsl(var(--primary));
  display: grid; place-items: center;
}
.video .play svg { width: 8px; height: 8px; fill: hsl(var(--primary-foreground)); }
.video .vt { font-size: var(--text-sm); font-weight: var(--weight-medium); line-height: 1.3; }
.video .vm { font-size: var(--text-xs); color: hsl(var(--muted-foreground)); }

/* ---- verdict ------------------------------------------------------------ */
.verdict {
  border-top: 1px solid hsl(var(--border));
  border-bottom: 1px solid hsl(var(--border));
  padding: var(--space-4) 0; margin: var(--space-5) 0;
}
.verdict .vl { font-family: var(--font-display); font-weight: var(--weight-bold); font-size: var(--text-base); display: block; margin-bottom: var(--space-2); }
.verdict p { margin: 0; font-size: var(--text-sm); line-height: var(--leading-relaxed); color: hsl(var(--muted-foreground)); }

/* ---- lists -------------------------------------------------------------- */
.lesson-list { list-style: none; margin: 0; padding: 0; }
/* Rows are <li> when they are inert and <button> when they can be opened, so
   this has to match both. A bare `li` selector leaves the buttons unstyled and
   their contents stretch to fill the row. */
.lesson-list > * {
  display: flex; gap: var(--space-4); align-items: center;
  width: 100%; min-height: var(--tap);
  padding: var(--space-3) 0;
  border: 0; border-bottom: 1px solid hsl(var(--border));
  background: none; text-align: left;
  font-family: var(--font-sans); font-size: var(--text-sm); color: inherit;
}
.lesson-list button.li { cursor: pointer; }
.lesson-list .n {
  flex: 0 0 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: var(--text-xs); font-weight: var(--weight-bold);
  background: hsl(var(--muted)); color: hsl(var(--muted-foreground));
  font-variant-numeric: tabular-nums;
}
.lesson-list .done .n { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
.lesson-list .now .n  { background: hsl(var(--foreground)); color: hsl(var(--background)); }
.lesson-list .t { flex: 1; line-height: var(--leading-snug); min-width: 0; }
.lesson-list .locked { opacity: .45; }
.lesson-list .meta {
  font-size: var(--text-xs); color: hsl(var(--muted-foreground));
  font-variant-numeric: tabular-nums;
}

/* ---- stats -------------------------------------------------------------- */
.stat-row { display: flex; gap: var(--space-3); margin-bottom: var(--space-5); }
.stat {
  flex: 1; min-width: 0;
  padding: var(--space-3) var(--space-4);
  border: 1px solid hsl(var(--border)); border-radius: var(--radius-sm);
}
.stat .v {
  font-family: var(--font-display); font-weight: var(--weight-black);
  font-size: var(--text-2xl); line-height: 1; font-variant-numeric: tabular-nums;
}
.stat .l {
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: var(--tracking-wider); color: hsl(var(--muted-foreground));
  margin-top: var(--space-1);
}

/* ---- odds and ends ------------------------------------------------------ */
.note { font-size: var(--text-sm); color: hsl(var(--muted-foreground)); line-height: var(--leading-relaxed); }
/* Classes rather than inline style attributes, so the deployment can run a
   Content-Security-Policy without 'unsafe-inline' on styles. */
.video-lead { margin-bottom: var(--space-3); }

/* ---- sign-in form ------------------------------------------------------- */
.field {
  display: block; width: 100%; box-sizing: border-box;
  min-height: var(--tap);
  margin-bottom: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid hsl(var(--border)); border-radius: var(--radius);
  background: hsl(var(--card)); color: hsl(var(--foreground));
  font-family: var(--font-sans); font-size: var(--text-base);
}
.field::placeholder { color: hsl(var(--muted-foreground)); }
#code { font-variant-numeric: tabular-nums; letter-spacing: var(--tracking-widest); }
.speech-done { margin-bottom: var(--space-4); }
.speech-done .said { text-align: center; }
.rule { border: 0; border-top: 1px solid hsl(var(--border)); margin: var(--space-5) 0; }
.link { color: hsl(var(--primary)); font-weight: var(--weight-medium); text-decoration: none; }