/* ========================================
   RESOURCES SECTION — lesson & exercise styles
   Uses the site palette from /style.css
   ======================================== */

:root {
  --soft-bg: #f2f3f5; /* very light grey for explanation boxes */
}

[data-theme="dark"] {
  --soft-bg: rgba(255, 255, 255, 0.07);
}

/* Breadcrumbs */
.crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.crumb:not(:last-child)::after {
  content: "›";
  margin: 0 0.5rem;
  color: var(--muted);
}

.crumb a {
  text-decoration: none;
}

.crumb[aria-current="page"] {
  color: var(--muted);
}

/* Lesson content column */
.lesson-content {
  max-width: 820px;
  margin: 0 auto;
}

.lesson-content h1 {
  font-size: 1.9rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.lesson-content h2 {
  font-size: 1.35rem;
  font-weight: 650;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.lesson-content dl dt {
  font-weight: 700;
  color: var(--brand);
}

.lesson-content dl dd {
  margin-bottom: 0.5rem;
}

.lesson-content kbd {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 4px;
  padding: 0.1em 0.45em;
  color: var(--text);
  box-shadow: 0 1px 0 var(--card-border);
}

/* Exercise container (fieldset) */
.exercise-container {
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  background: var(--card-bg);
}

.exercise-name {
  float: none;
  width: auto;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  padding: 0 0.5rem;
  margin-bottom: 0.5rem;
}

/* Interactive number lines */
.interactive-number-lines {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.interactive-container {
  flex: 1 1 320px;
  max-width: 520px;
  text-align: center;
}

.interactive-container h3 {
  font-size: 1.05rem;
  font-weight: 650;
  margin-bottom: 0.5rem;
}

.interactive-container svg {
  max-width: 100%;
  height: auto;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.generic-button-aero {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  width: 44px;
  height: 44px;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.generic-button-aero:hover {
  filter: brightness(0.9);
}

.generic-button-brand {
  background: var(--brand);
  color: #fff;
  border: none;
  border-radius: 8px;
  width: 44px;
  height: 44px;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.generic-button-brand:hover {
  filter: brightness(0.9);
}

/* Horizontal row of vector control groups (wraps on narrow screens) */
.controls-row {
  display: flex;
  justify-content: center;
  align-items: center;
  column-gap: 2rem;
  flex-wrap: wrap;
}

/* Soft grey definition box */
.definition-box {
  background: var(--soft-bg);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.definition-box dl {
  margin: 0;
}

.definition-box dd:last-child {
  margin-bottom: 0;
}

/* Collapsible explanation */
.explanation-container {
  margin-top: 1rem;
}

.explanation-container > a {
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
}

#explanationText {
  background: var(--soft-bg);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-top: 0.75rem;
}

#explanationText p {
  margin: 0;
}

/* Drag and drop exercise */
#draggables {
  min-height: 56px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 1rem;
}

.draggable {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--brand);
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  font-weight: 650;
  text-align: center;
  cursor: grab;
  user-select: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.draggable:active {
  cursor: grabbing;
}

.drop-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.drop-zone {
  flex: 1 1 220px;
  min-height: 160px;
  border: 2px dashed var(--card-border);
  border-radius: 12px;
  padding: 0.75rem;
  text-align: center;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  cursor: pointer;
}

.drop-zone h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--brand);
  pointer-events: none;
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(91, 192, 235, 0.08);
}

.drop-zone .draggable {
  display: inline-flex;
  margin: 0.25rem;
  padding: 0.35rem 0.9rem;
  font-size: 0.9rem;
  cursor: default;
  box-shadow: none;
}

.drop-zone-hint {
  font-size: 0.85rem;
  color: var(--muted);
  pointer-events: none;
}

.feedback-container p {
  color: var(--brand);
  font-weight: 600;
  min-height: 1.5rem;
  margin: 0.75rem 0 0;
}

#restart-button {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.4rem 0.9rem;
  margin-top: 0.75rem;
  cursor: pointer;
}

#restart-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#completion-message {
  background: var(--soft-bg);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  line-height: 1.6;
}

/* Reflection exercise */
.reflection {
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  background: var(--card-bg);
}

.reflection-header {
  float: none;
  width: auto;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  padding: 0 0.5rem;
  margin-bottom: 0.5rem;
}

.reflection input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  margin-bottom: 0.75rem;
}

.reflection input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

.reflection button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.45rem 1.1rem;
  font-weight: 650;
  cursor: pointer;
  margin-right: 0.5rem;
}

.reflection button:hover {
  filter: brightness(0.92);
}

#student-reflections p {
  background: var(--soft-bg);
  border-radius: 8px;
  padding: 0.6rem 0.85rem;
  margin: 0.75rem 0 0;
}

#reflection-explanation {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--card-border);
  color: var(--muted);
  line-height: 1.6;
}

/* Interactive SVG captions */
.svg-caption {
  font-weight: 600;
  margin: 0.5rem 0 0;
  min-height: 1.5rem;
  text-align: center;
}

/* Stepper buttons: prevent long-press selection so press-and-hold repeat works on touch */
.generic-button-aero,
.generic-button-brand,
.generic-button-success {
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.generic-button-success {
  background: var(--success);
  color: var(--raisin-black);
  border: none;
  border-radius: 8px;
  width: 44px;
  height: 44px;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.generic-button-success:hover {
  filter: brightness(0.9);
}

/* Question progress circles */
.progress-circles {
  display: flex;
  gap: 0.6rem;
  margin: 1rem 0;
}

.progress-circle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--card-border);
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.progress-circle.current {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 192, 235, 0.25);
}

.progress-circle.solved {
  background: var(--success);
  border-color: var(--success);
}

/* Question answer row */
.answer-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.answer-row input {
  width: 120px;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}

.answer-row input:focus {
  outline: none;
  border-color: var(--accent);
}

.answer-unit {
  font-weight: 700;
}

.qa-button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.45rem 1.1rem;
  font-weight: 650;
  cursor: pointer;
}

.qa-button:hover {
  filter: brightness(0.9);
}

.qa-button-secondary {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.45rem 1.1rem;
  cursor: pointer;
}

.qa-button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* "Where this fits in your exam spec" box */
.spec-box {
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.spec-box summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
}

.spec-box-table {
  overflow-x: auto;
  margin-top: 0.75rem;
}

.spec-box table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.spec-box th,
.spec-box td {
  border: 1px solid var(--card-border);
  padding: 0.4rem 0.75rem;
  text-align: left;
}

.spec-box th {
  font-weight: 650;
}

.spec-box-note {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Lesson pagination */
.lesson-pagination {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--card-border);
}

/* Resources hub cards */
.lesson-card {
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.lesson-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.subject-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: var(--tint);
  color: var(--brand);
  margin-bottom: 0.5rem;
}

.coming-soon {
  opacity: 0.65;
}

.coming-soon-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: var(--card-border);
  color: var(--muted);
}