/* Lesson panel content styles. Full curriculum styling lands in M4;
   M1 ships the welcome/orientation card using the same vocabulary. */

.lesson-head {
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px 8px;
  border-bottom: 1px solid var(--hairline-soft);
}
.lesson-head .kicker {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}
.lesson-head h2 { font-size: 1.05rem; flex: 1; }

.lesson-body {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.lesson-body p { color: var(--ink); font-size: 0.88rem; }
.lesson-body p.dim { color: var(--ink-dim); }

.observe {
  background: var(--ice-soft);
  border-left: 3px solid var(--ice);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 8px 12px;
  font-size: 0.85rem;
}
.observe::before {
  content: "Observe";
  display: block;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ice);
  margin-bottom: 3px;
  font-weight: 700;
}

.try-this {
  background: #5fd4a214;
  border-left: 3px solid var(--good);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 8px 12px;
  font-size: 0.85rem;
}
.try-this::before {
  content: "Try it";
  display: block;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--good);
  margin-bottom: 3px;
  font-weight: 700;
}

.lesson-keys {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 10px;
  font-size: 0.8rem;
  color: var(--ink-dim);
  align-items: center;
}

/* ---------- Curriculum player (M4) ---------- */

.lesson-body ul { padding-left: 20px; display: flex; flex-direction: column; gap: 5px; }
.lesson-body li { color: var(--ink); font-size: 0.86rem; }
.lesson-body .hint { color: var(--ink-faint); font-size: 0.8rem; }

.lesson-foot {
  flex: none;                    /* pinned to the panel bottom (Nuke pattern) */
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-top: 1px solid var(--hairline-soft);
  background: var(--bg-panel);
}
.lesson-foot .step-count { flex: 1; text-align: center; color: var(--ink-faint); font-size: 0.78rem; }
.lesson-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.step-task {
  border: 1px dashed var(--steel);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.84rem;
  color: var(--ink-dim);
}
.step-task::before { content: '◻ '; color: var(--steel); }
.step-task.met {
  border-color: var(--good);
  color: var(--good);
  border-style: solid;
}
.step-task.met::before { content: '✓ '; }

/* Formula rendering */
.fm { font-family: var(--mono); font-size: 0.92em; }
.fm i { font-style: italic; padding: 0 0.5px; }
.fm-block { text-align: center; margin: 10px 0; font-size: 1.05rem; }
.fm-frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; margin: 0 2px; }
.fm-frac .fm-top { border-bottom: 1px solid currentColor; padding: 0 4px 1px; }
.fm-frac .fm-bot { padding: 0 4px; }
.fm-sqrt-arg { border-top: 1px solid currentColor; padding: 0 2px; }

/* Quiz */
.quiz-item { border-top: 1px solid var(--hairline-soft); padding-top: 12px; margin-top: 4px; display: flex; flex-direction: column; gap: 8px; }
.quiz-prompt { font-size: 0.88rem; color: var(--ink); }
.quiz-choices { display: flex; flex-direction: column; gap: 6px; }
.quiz-choice {
  text-align: left;
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--ink);
  padding: 8px 12px;
  font-size: 0.84rem;
  cursor: pointer;
}
.quiz-choice:hover:not(:disabled) { border-color: var(--steel); }
.quiz-choice.picked-right, .quiz-choice.reveal-right { border-color: var(--good); background: #37b26c1a; }
.quiz-choice.picked-wrong { border-color: var(--bad); background: #d5484f1a; }
.quiz-why {
  font-size: 0.8rem;
  color: var(--ink-dim);
  border-left: 3px solid var(--steel);
  padding: 6px 10px;
  background: var(--bg-raised);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.quiz-canvas-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.quiz-canvas-choice {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 6px;
  cursor: pointer;
  background: var(--bg-inset);
}
.quiz-canvas-choice canvas { width: 100%; height: 90px; display: block; }
.quiz-canvas-choice.loading { opacity: 0.4; }
.quiz-canvas-choice.loading::after { content: 'simulating…'; font-size: 0.7rem; color: var(--ink-faint); }
.quiz-canvas-choice.picked-right { border-color: var(--good); }
.quiz-canvas-choice.picked-wrong { border-color: var(--bad); }
.quiz-cand-label { font-size: 0.72rem; color: var(--ink-dim); text-align: center; margin-top: 3px; }
.quiz-read-box { background: var(--bg-inset); border: 1px solid var(--hairline); border-radius: var(--radius-sm); padding: 6px; }
.quiz-read-box.loading { min-height: 60px; opacity: 0.5; }
.quiz-read-canvas { width: 100%; height: 140px; display: block; }
.quiz-input-row { display: flex; gap: 8px; align-items: center; }
.quiz-input-row input {
  width: 90px;
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--ink);
  padding: 5px 8px;
  font-family: var(--mono);
}
.quiz-score { margin-top: 8px; font-size: 0.9rem; }

/* Challenge */
.challenge-brief { font-size: 0.86rem; }
.challenge-brief p { margin-bottom: 8px; }
.goal-list { display: flex; flex-direction: column; gap: 5px; }
.goal-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 0.82rem;
}
.goal-row .g-star { color: var(--warn); font-size: 0.75rem; letter-spacing: 1px; }
.goal-row > span:nth-child(2) { flex: 1; }
.goal-row .g-val { font-family: var(--mono); color: var(--ink-dim); }
.goal-row.met { border-color: var(--good); }
.goal-row.met .g-val { color: var(--good); }
.goal-row.failed { border-color: var(--bad); }
.goal-row.failed .g-val { color: var(--bad); }
.challenge-result { text-align: center; padding: 10px; }
.challenge-result .r-stars { font-size: 1.6rem; color: var(--warn); letter-spacing: 4px; }

/* Course map */
.map-card { width: min(720px, 92vw); max-height: 86vh; display: flex; flex-direction: column; }
.map-progress { color: var(--ink-dim); font-size: 0.8rem; margin-right: 10px; }
.map-scroll { overflow-y: auto; padding: 4px 2px; display: flex; flex-direction: column; gap: 14px; }
.map-unit.locked { opacity: 0.55; }
.map-unit-head { display: flex; align-items: baseline; gap: 10px; }
.mu-num { color: var(--steel); font-size: 0.75rem; }
.mu-title { font-weight: 600; font-size: 0.95rem; flex: 1; }
.mu-count { color: var(--ink-faint); font-size: 0.75rem; }
.mu-license { color: var(--warn); font-size: 0.72rem; }
.map-unit-blurb { color: var(--ink-faint); font-size: 0.78rem; margin: 2px 0 6px; }
.map-items { display: flex; flex-direction: column; gap: 3px; }
.map-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-raised);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-sm);
  color: var(--ink-dim);
  padding: 5px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  text-align: left;
}
.map-item:hover:not(.locked) { border-color: var(--steel); color: var(--ink); }
.map-item.done { color: var(--ink); }
.map-item.done .mi-check { color: var(--good); }
.map-item.locked { cursor: default; opacity: 0.5; }
.map-item .mi-title { flex: 1; }
.map-item .mi-stars { color: var(--warn); font-size: 0.72rem; letter-spacing: 1px; }
.map-badges { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px 0 10px; }
.badge-chip {
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.74rem;
  color: var(--ink-dim);
}

/* Unit splash */
.splash-scrim { backdrop-filter: blur(3px); }
.splash-card { width: min(520px, 90vw); text-align: center; padding: 34px 30px; }
.splash-kicker { color: var(--steel); font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase; }
.splash-title { font-size: 1.6rem; margin: 8px 0 12px; }
.splash-intro { color: var(--ink-dim); font-size: 0.9rem; margin-bottom: 10px; }
.splash-license { color: var(--warn); font-size: 0.8rem; margin-bottom: 6px; }

/* Header progress dial + license */
.progress-dial {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--ink-dim);
  cursor: pointer;
  padding: 4px 6px;
}
.progress-dial:hover { color: var(--ink); }
.dial-arc { transition: stroke-dashoffset 0.6s ease; }
.dial-pct { font-size: 0.7rem; font-family: var(--mono); }
.license-chip { color: var(--warn); font-size: 0.74rem; margin-right: 4px; }

/* Widgets */
.widget-box {
  background: var(--bg-inset);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.widget-canvas { display: block; }
.widget-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  font-size: 0.8rem;
  color: var(--ink-dim);
}
.widget-grid .val { text-align: right; font-family: var(--mono); color: var(--ink); }
.widget-callout { font-size: 0.82rem; color: var(--ink-dim); }
.widget-num {
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--ink);
  padding: 3px 8px;
  font-family: var(--mono);
  width: 110px;
  justify-self: end;
}
.q-bar { height: 8px; background: var(--bg-raised); border-radius: 4px; overflow: hidden; }
.q-bar-fill { height: 100%; background: linear-gradient(90deg, var(--ice), var(--sig-drag)); width: 0; transition: width 0.15s; }

/* Settings modal */
.settings-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 14px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--ink-dim);
}
.settings-grid select { justify-self: start; }

/* Certificate */
.cert-holder svg { width: 100%; height: auto; display: block; border-radius: 4px; }

/* Quiz-full mode: exam takes the stage, content in a readable centred column */
#app.quiz-full #lessonArea { border-right: none; }
#app.quiz-full .lesson-head,
#app.quiz-full .lesson-body {
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}