/* App shell: CSS grid layout, header, status bar, boot screen, course map. */

#app {
  display: grid;
  height: 100vh;
  grid-template-columns: var(--lesson-w) minmax(0, 1fr) var(--controls-w);
  grid-template-rows: var(--header-h) minmax(200px, 38%) minmax(0, 1fr) var(--status-h);
  grid-template-areas:
    "header header  header"
    "lesson anim    controls"
    "lesson charts  controls"
    "lesson status  status";
}
#app.lesson-closed { grid-template-columns: 0 minmax(0, 1fr) var(--controls-w); }
#app.lesson-closed #lessonArea { display: none; }

/* Exam mode: checkpoints and license exams take the full stage. Quizzes never
   drive the live sim, so the bench is cleared while testing. */
#app.quiz-full {
  grid-template-columns: minmax(0, 1fr) 0 0;
  grid-template-rows: var(--header-h) minmax(0, 1fr) var(--status-h);
  grid-template-areas:
    "header header header"
    "lesson lesson lesson"
    "status status status";
}
#app.quiz-full #animArea,
#app.quiz-full #chartArea,
#app.quiz-full #controlsArea { display: none; }
#app.quiz-full #lessonArea { border-right: none; }

[data-area="header"] { grid-area: header; }
[data-area="lesson"] { grid-area: lesson; }
[data-area="anim"]   { grid-area: anim; }
[data-area="charts"] { grid-area: charts; }
[data-area="controls"] { grid-area: controls; }
[data-area="status"] { grid-area: status; }

/* ------- Header ------- */
#header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--hairline);
  user-select: none;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.16em;
  font-size: 0.98rem;
  color: var(--amber);
  white-space: nowrap;
}
.brand small {
  display: block;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  font-weight: 400;
  margin-top: -4px;
}
a.brand { text-decoration: none; color: var(--amber); }
a.brand:hover { text-shadow: 0 0 14px var(--amber-glow); }
a.brand:hover small { color: var(--ink); }
.header-spacer { flex: 1; }
.header-group { display: flex; align-items: center; gap: 6px; }

/* ------- Animation area ------- */
#animArea {
  position: relative;
  background: var(--bg-inset);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
  min-height: 0;
}
#animCanvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: crosshair; }
#animOverlay {
  position: absolute;
  top: 8px; left: 12px; right: 12px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  pointer-events: none;
  z-index: 2;
}
#animOverlay > * { pointer-events: auto; }

.sim-banner {
  position: absolute;
  left: 50%; top: 42%;
  transform: translate(-50%, -50%);
  background: #1e1a20ee;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 14px 22px;
  text-align: center;
  z-index: 3;
  max-width: 400px;
  box-shadow: 0 8px 30px #0009;
}
.sim-banner.fail { border-color: var(--bad); }
.sim-banner .title { font-weight: 700; margin-bottom: 4px; }
.sim-banner.fail .title { color: var(--bad); }

/* ------- Charts area ------- */
#chartArea {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--bg);
}
#chartTabs {
  display: flex;
  gap: 2px;
  padding: 6px 10px 0;
  border-bottom: 1px solid var(--hairline-soft);
  flex: none;
}
#chartCanvas { flex: 1; min-height: 0; width: 100%; display: block; }
#metricsBar {
  flex: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 4px 12px;
  border-top: 1px solid var(--hairline-soft);
  font-size: 0.8rem;
  color: var(--ink-dim);
  min-height: 26px;
  align-items: center;
}
#metricsBar .m { white-space: nowrap; }
#metricsBar .m b { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
#metricsBar .m.good b { color: var(--good); }
#metricsBar .m.bad b { color: var(--bad); }

/* ------- Side panels ------- */
#controlsArea, #lessonArea {
  background: var(--bg-panel);
  overflow-y: auto;
  min-height: 0;
}
#controlsArea { border-left: 1px solid var(--hairline); padding: 10px 12px 30px; }
#lessonArea { border-right: 1px solid var(--hairline); display: flex; flex-direction: column; }

/* ------- Status bar ------- */
#statusBar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 14px;
  background: var(--bg-panel);
  border-top: 1px solid var(--hairline);
  font-size: 0.74rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  user-select: none;
  overflow: hidden;
  white-space: nowrap;
}
#statusBar b { color: var(--ink-dim); font-weight: 600; }

/* ------- Boot screen ------- */
#bootCheck {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg);
  z-index: 100;
}
.boot-card { text-align: center; color: var(--ink-dim); }
.boot-mark {
  font-weight: 700; letter-spacing: 0.3em; font-size: 1.4rem;
  color: var(--amber); margin-bottom: 10px;
}
.boot-error { padding: 3rem; text-align: center; }

/* ------- Responsive ------- */
@media (max-width: 1250px) {
  :root { --lesson-w: 330px; --controls-w: 270px; }
}
@media (max-width: 1050px) {
  #app {
    grid-template-columns: minmax(0, 1fr) var(--controls-w);
    grid-template-areas:
      "header header"
      "anim   controls"
      "charts controls"
      "status status";
  }
  #lessonArea {
    position: fixed;
    left: 0; top: var(--header-h); bottom: var(--status-h);
    width: min(var(--lesson-w), 88vw);
    z-index: 20;
    box-shadow: 12px 0 30px #000a;
  }
  #app.lesson-closed #lessonArea { display: none; }
  #app.quiz-full #lessonArea { position: static; width: auto; box-shadow: none; }
}