/* Free Body Diagrams: layout only. Tokens and base elements come from ../shared/base.css. */

.bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.level { display: flex; gap: 6px; }
.level button.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.force-filter { margin-bottom: 20px; }
.filter-label { color: var(--ink-2); font-size: 0.95rem; font-weight: 600; margin-bottom: 8px; }
#force-filter { display: flex; gap: 6px; }
.chip, .chip:hover { flex: 1 1 0; min-width: 0; min-height: 36px; padding: 0 4px; font-size: 0.8rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; background: transparent; color: var(--ink-3); border-color: var(--line-soft); }
.chip:hover { background: var(--paper-deep); color: var(--ink-2); }
.chip.on, .chip.on:hover { background: var(--card); color: var(--ink); border-color: var(--ink); }
.chip:disabled { opacity: 1; cursor: default; }
@media (max-width: 600px) { #force-filter { flex-wrap: wrap; } .chip { flex: 1 1 30%; } }

.card + .card { margin-top: 20px; }

/* the scenario drawing is the hero */
.quiz { padding-top: 0; }
.hero {
  margin: 0 -24px 24px;
  padding: 20px 24px 22px;
  background: #ebe8f0;
  border-bottom: var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
}
.scene-wrap { max-width: 420px; margin: 0 auto; }
.scene { width: 100%; height: auto; display: block; }
.describe { margin-top: 12px; text-align: center; line-height: 1.5; }

.q + .q { margin-top: 26px; }
.q h3 { margin-bottom: 10px; color: var(--ink-2); }
.q .feedback { margin-top: 12px; }

/* step 1: force checkboxes */
.force-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.force-row {
  display: grid; grid-template-columns: auto 1fr; column-gap: 10px; align-items: center;
  min-height: 48px; padding: 8px 14px; border: 2px solid var(--line); border-radius: var(--radius-sm);
  background: var(--card); cursor: pointer; font-weight: 600;
}
.force-row input { width: 20px; height: 20px; margin: 0; accent-color: var(--ink); }
.force-row .note { grid-column: 2; font-weight: 400; font-size: 0.92rem; line-height: 1.4; color: var(--ink-2); }
.force-row .note:empty { display: none; }
.row-correct { border-color: var(--right); background: var(--right-bg); color: var(--right); }
.row-wrong { border-color: var(--wrong); background: var(--wrong-bg); color: var(--wrong); }
.row-reveal { border-color: var(--right); border-style: dashed; }
.row-wrong .note, .row-correct .note, .row-reveal .note { color: inherit; }

/* step 2: direction buttons per force */
.dir-row + .dir-row { margin-top: 14px; }
.dir-name { font-weight: 600; margin-bottom: 6px; }
.angle-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.angle-btn { background: var(--card); color: var(--ink); border-color: var(--line); font-weight: 500; padding: 0 14px; }
.angle-btn:hover:not(:disabled) { background: var(--paper-deep); border-color: var(--ink); }
.btn-selected, .btn-selected:hover:not(:disabled) { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.angle-correct, .angle-reveal { background: var(--right-bg); color: var(--right); border-color: var(--right); }
.angle-reveal { border-style: dashed; }
.angle-wrong { background: var(--wrong-bg); color: var(--wrong); border-color: var(--wrong); }
.angle-btn:disabled { opacity: 1; cursor: default; }
.dir-row .note { margin-top: 8px; font-size: 0.92rem; color: var(--ink-2); line-height: 1.4; }
.dir-row .note:empty { display: none; }

/* step 3: sums */
.axes-note { color: var(--ink-2); font-size: 0.95rem; line-height: 1.5; margin-bottom: 12px; }
.sum-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.sum-grid label { display: block; font-weight: 600; margin-bottom: 6px; }
.sum-grid .feedback { margin-top: 8px; padding: 8px 12px; font-size: 0.92rem; }
input.input-correct { border-color: var(--right); background: var(--right-bg); color: var(--right); }
input.input-wrong { border-color: var(--wrong); background: var(--wrong-bg); color: var(--wrong); }
input:disabled { opacity: 1; }

.actions { display: flex; gap: 10px; margin-top: 26px; }
.actions button { flex: 1 1 auto; }

/* worked solution */
.explanation { margin-top: 16px; line-height: 1.6; }
.explanation strong { display: block; margin-bottom: 8px; }
.fbd { max-width: 240px; margin: 0 auto 12px; }
.fbd svg { width: 100%; height: auto; display: block; }
.explanation ol { margin: 0 0 14px; padding-left: 22px; }
.explanation li + li { margin-top: 6px; }
.table-wrap { overflow-x: auto; margin-bottom: 12px; }
.explanation table { background: var(--card); border-radius: var(--radius-sm); }
.explanation td, .explanation th { font-variant-numeric: tabular-nums; }
.totals { font-weight: 600; }

.complete { text-align: center; }
.final-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 10px 0 20px; }
.final-score { font-size: 2.4rem; font-weight: 800; font-variant-numeric: tabular-nums; line-height: 1.1; }
.final-sub { color: var(--ink-2); }

@media (max-width: 560px) {
  .card { padding: 20px; }
  .hero { margin: 0 -20px 20px; padding: 16px 20px 18px; }
  .force-list { grid-template-columns: 1fr; }
  .sum-grid { grid-template-columns: 1fr; }
  .final-score { font-size: 1.9rem; }
}