/* Lesson panel, course map, quizzes, challenges, and the fm math renderer. */

/* ------- Lesson panel ------- */
.lesson-head {
  flex: none;
  padding: 12px 16px 10px;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.lesson-head .l-title { font-weight: 700; font-size: 0.98rem; flex: 1; }
.lesson-head .l-unit { font-size: 0.7rem; letter-spacing: 0.1em; color: var(--copper); text-transform: uppercase; }

.lesson-body {
  flex: 1;
  overflow-y: auto;
  padding: 14px 18px 20px;
  font-size: 0.92rem;
  min-height: 0;
}
.lesson-body p { margin: 0 0 0.8em; }
.lesson-body p:last-child { margin-bottom: 0; }
.lesson-body h4 { margin: 1em 0 0.4em; color: var(--amber); font-size: 0.92rem; }
.lesson-body ul { margin: 0 0 0.8em; padding-left: 1.3em; }
.lesson-body li { margin-bottom: 0.3em; }
.lesson-body .hint { color: var(--ink-dim); font-size: 0.85rem; }

.observe {
  margin-top: 12px;
  background: var(--amber-soft);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 9px 12px;
  font-size: 0.88rem;
}
.observe::before {
  content: "Observe";
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 2px;
}
.try-this {
  margin-top: 12px;
  background: #5fd4a214;
  border-left: 3px solid var(--good);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 9px 12px;
  font-size: 0.88rem;
}
.try-this::before {
  content: "Try it";
  display: block;
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--good); margin-bottom: 2px;
}

.lesson-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

.lesson-foot {
  flex: none;
  border-top: 1px solid var(--hairline);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.lesson-foot .step-count { flex: 1; text-align: center; color: var(--ink-faint); font-size: 0.8rem; }

.step-task {
  margin-top: 12px;
  border: 1px dashed var(--hairline);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--ink-dim);
}
.step-task.met { border-color: var(--good); color: var(--good); }
.step-task.met::before { content: "✓ "; }

/* ------- Course map ------- */
.coursemap {
  width: min(1080px, 94vw);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
}
.cm-units {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
  overflow-y: auto;
  padding: 4px 2px 12px;
}
.cm-unit {
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.cm-unit.locked { opacity: 0.55; }
.cm-unit-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.cm-unit-head .u-name { font-weight: 700; font-size: 0.9rem; flex: 1; }
.cm-unit-head .u-count { font-size: 0.72rem; color: var(--ink-faint); }
.cm-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--ink-dim);
  padding: 4px 8px;
  font-size: 0.84rem;
  cursor: pointer;
}
.cm-item:hover { background: var(--bg-panel); color: var(--ink); }
.cm-item.current { color: var(--amber); font-weight: 600; }
.cm-item.done .cm-mark { color: var(--good); }
.cm-item:disabled { cursor: not-allowed; color: var(--locked); }
.cm-mark { width: 18px; flex: none; text-align: center; }
.cm-item .cm-stars { margin-left: auto; font-size: 0.72rem; }
.cm-gate {
  margin: 8px 0 2px;
  text-align: center;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--copper);
  text-transform: uppercase;
}

/* ------- Quiz ------- */
.quiz-item { margin-bottom: 18px; }
.quiz-prompt { font-weight: 600; margin-bottom: 8px; }
.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: 0.88rem;
  cursor: pointer;
}
.quiz-choice:hover { border-color: var(--amber); }
.quiz-choice.picked-right { border-color: var(--good); background: #5fd4a214; }
.quiz-choice.picked-wrong { border-color: var(--bad); background: #e8695f14; }
.quiz-choice.reveal-right { border-color: var(--good); }
.quiz-choice:disabled { cursor: default; }
.quiz-why { font-size: 0.82rem; color: var(--ink-dim); margin-top: 6px; padding-left: 4px; border-left: 2px solid var(--hairline); }
.quiz-canvas-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.quiz-canvas-choice {
  background: var(--bg-inset);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 4px;
  cursor: pointer;
}
.quiz-canvas-choice:hover { border-color: var(--amber); }
.quiz-canvas-choice.picked-right { border-color: var(--good); }
.quiz-canvas-choice.picked-wrong { border-color: var(--bad); }
.quiz-canvas-choice canvas { width: 100%; height: 90px; display: block; }
.quiz-score { font-weight: 700; margin-top: 10px; }

.quiz-read-canvas {
  width: 100%; height: 170px; display: block;
  background: var(--bg-inset);
  border: 1px solid var(--hairline);
  border-radius: 5px;
}

/* Exam mode: center the quiz at a readable width, let the graphs breathe. */
#app.quiz-full .lesson-head,
#app.quiz-full .lesson-body,
#app.quiz-full .lesson-foot {
  padding-left: max(18px, calc(50% - 430px));
  padding-right: max(18px, calc(50% - 430px));
}
#app.quiz-full .quiz-canvas-choice canvas { height: 160px; }
#app.quiz-full .quiz-read-canvas { height: 280px; }

.quiz-input-row { display: flex; gap: 8px; align-items: center; }
.quiz-input-row input {
  background: var(--bg-inset); color: var(--ink);
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  padding: 5px 8px; width: 110px; font-family: var(--mono);
}

/* ------- Challenge ------- */
.challenge-brief { margin-bottom: 12px; }
.goal-list { display: flex; flex-direction: column; gap: 5px; margin: 10px 0; }
.goal-row {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem;
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
}
.goal-row .g-star { color: var(--amber); font-size: 0.75rem; width: 34px; flex: none; }
.goal-row .g-val { margin-left: auto; font-family: var(--mono); font-size: 0.8rem; 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: 8px 0; }
.challenge-result .r-stars { font-size: 2rem; letter-spacing: 6px; color: var(--amber); }
.challenge-result .r-stars .off { color: var(--hairline); }

/* ------- Certificate printing ------- */
@media print {
  body.printing-cert #app, body.printing-cert .toast-wrap { display: none !important; }
  body.printing-cert .modal-scrim { position: static; background: white; }
  body.printing-cert .modal-card { box-shadow: none; border: none; max-height: none; background: white; }
  body.printing-cert .modal-card .btn, body.printing-cert .modal-card input,
  body.printing-cert .modal-card label, body.printing-cert .modal-card h2 { display: none; }
}

/* ------- fm math renderer ------- */
.fm { font-family: Georgia, "Times New Roman", serif; font-size: 1.04em; white-space: nowrap; }
.fm-block { display: block; text-align: center; margin: 0.7em 0; overflow-x: auto; white-space: nowrap; }
.fm i, .fm .fm-v { font-style: italic; font-family: Georgia, serif; }
.fm sub, .fm sup { font-size: 0.72em; }
.fm-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: -0.7em;
  margin: 0 2px;
  line-height: 1.15;
}
.fm-num { border-bottom: 1px solid currentColor; padding: 0 0.25em 1px; }
.fm-den { padding: 0 0.25em; }
.fm-sqrt { display: inline-flex; align-items: stretch; }
.fm-sqrt-sym { align-self: stretch; }
.fm-sqrt-body { border-top: 1px solid currentColor; padding: 0 3px 0 1px; }
.fm-int { font-size: 1.25em; vertical-align: -0.15em; margin-right: 1px; }