/* Explanation pages */
.hero--small {
  padding: 120px 0 40px;
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.skill-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.skill-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 28px;
  border-bottom: 1px solid var(--gray-100);
}

.skill-icon {
  font-size: 2.2rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #ede9fe, #dbeafe);
  border-radius: 12px;
  flex-shrink: 0;
}

.skill-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.skill-level {
  display: flex;
  align-items: center;
  gap: 6px;
}

.level-label {
  font-size: 0.8rem;
  color: var(--gray-400);
  font-weight: 600;
}

.level-stars {
  font-size: 0.9rem;
  letter-spacing: 2px;
}

.skill-body {
  padding: 24px 28px;
}

.skill-what {
  font-size: 1rem;
  color: var(--gray-600);
  margin-bottom: 20px;
  line-height: 1.7;
}

.skill-example {
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-bottom: 20px;
  border-left: 4px solid var(--purple-light);
}

.example-visual {
  font-size: 1.6rem;
  text-align: center;
  padding: 8px 0 12px;
  letter-spacing: 2px;
  line-height: 1.8;
}

.cta-community {
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.cta-community a {
  color: var(--purple);
  font-weight: 700;
  text-decoration: none;
}

.example-story {
  font-size: 1rem;
  color: var(--gray-800);
  line-height: 1.7;
  margin-bottom: 12px;
}

.example-math {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--purple-dark);
  text-align: center;
  padding: 8px 0;
}

.answer {
  color: var(--green);
}

.example-note {
  font-size: 0.9rem;
  color: var(--gray-600);
  text-align: center;
  margin-top: 8px;
  font-style: italic;
}

.skill-tip {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.6;
  padding: 12px 16px;
  background: #fef3c7;
  border-radius: var(--radius-sm);
  margin-bottom: 0;
}

.explain-cta {
  text-align: center;
  padding: 48px 0 0;
}

.explain-cta p {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 16px;
}

/* Table intro & headings */
.table-intro {
  max-width: 800px;
  margin: 0 auto 24px;
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.7;
}

.table-intro a {
  color: var(--purple);
  font-weight: 700;
  text-decoration: none;
}

.table-heading {
  max-width: 800px;
  margin: 32px auto 8px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--gray-900);
}

.table-desc {
  max-width: 800px;
  margin: 0 auto 16px;
  font-size: 0.9rem;
  color: var(--gray-400);
  line-height: 1.6;
}

/* Mode tabs */
.mode-tabs {
  max-width: 800px;
  margin: 0 auto 24px;
  display: flex;
  gap: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--purple-light);
}

.mode-tab {
  flex: 1;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  border: none;
  cursor: pointer;
  background: var(--white);
  color: var(--gray-600);
  transition: var(--transition);
}

.mode-tab.active {
  background: var(--purple);
  color: var(--white);
}

.mode-panel {
  display: none;
}

.mode-panel.active {
  display: block;
}

/* Tags for difficulty */
.tag-yes, .tag-maybe, .tag-no {
  font-size: 0.8rem;
  font-weight: 700;
  white-space: nowrap;
}

.row-dimmed {
  opacity: 0.5;
}

/* Grade/Belt Overview Table */
.overview-table-wrap {
  max-width: 800px;
  margin: 0 auto 32px;
  overflow-x: auto;
}

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

.overview-table th,
.overview-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.overview-table th {
  background: var(--gray-50);
  font-weight: 700;
  color: var(--gray-800);
  white-space: nowrap;
}

.overview-table td {
  color: var(--gray-600);
}

.overview-table tr:last-child td {
  border-bottom: none;
}

.belt-dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  vertical-align: middle;
  margin-right: 6px;
  border: 1px solid var(--gray-200);
}

.belt-dot--white { background: #fff; }
.belt-dot--yellow { background: #facc15; }
.belt-dot--orange { background: #fb923c; }
.belt-dot--green { background: #22c55e; }
.belt-dot--blue { background: #3b82f6; }
.belt-dot--brown { background: #92400e; }
.belt-dot--black { background: #1f2937; border-color: #1f2937; }
.belt-dot--gold { background: linear-gradient(135deg, #f59e0b, #d97706); }

.tag-kids,
.tag-adult {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin: 1px 2px;
}

.tag-kids { background: #dbeafe; color: #1d4ed8; }
.tag-adult { background: #fef3c7; color: #92400e; }

/* Grade section headers */
.grade-header {
  max-width: 800px;
  margin: 40px auto 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.grade-header h2 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--gray-900);
}

.grade-belt {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--gray-100);
  color: var(--gray-600);
}

/* Skill meta: grade + belt inline */
.skill-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  flex-wrap: wrap;
}

.skill-grade {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-400);
}

/* Area grid visualization (like Math Fighter) */
.visual-area-grid {
  display: inline-grid;
  gap: 2px;
  margin: 12px auto;
}

.visual-area-grid span {
  width: 22px;
  height: 22px;
  background: var(--purple-light);
  border-radius: 3px;
}

.visual-rect-wrap {
  text-align: center;
  margin: 12px 0;
}

.visual-rect-outline {
  display: inline-block;
  border: 3px dashed var(--orange);
  border-radius: 4px;
  position: relative;
  padding: 8px;
}

.visual-rect-label {
  position: absolute;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--gray-800);
}

.visual-rect-label.top { top: -20px; left: 50%; transform: translateX(-50%); }
.visual-rect-label.left { left: -28px; top: 50%; transform: translateY(-50%); }

/* Power grid (square) */
.visual-power-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin: 12px 0;
  flex-wrap: wrap;
}

.visual-power-item {
  text-align: center;
}

.visual-power-grid {
  display: inline-grid;
  gap: 3px;
}

.visual-power-grid span {
  width: 24px;
  height: 24px;
  background: var(--blue-light);
  border-radius: 3px;
}

/* 3D cube visualization */
.visual-cube-scene {
  width: 100px;
  height: 100px;
  perspective: 400px;
  margin: 8px auto;
}

.visual-cube-3d {
  width: 56px;
  height: 56px;
  position: relative;
  transform-style: preserve-3d;
  margin: 10px auto 0;
  animation: cube-spin 12s linear infinite;
}

@keyframes cube-spin {
  from { transform: translateZ(-28px) rotateX(-20deg) rotateY(0deg); }
  to   { transform: translateZ(-28px) rotateX(-20deg) rotateY(360deg); }
}

.cube-face {
  position: absolute;
  width: 56px;
  height: 56px;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: repeat(2, 24px);
  grid-template-rows: repeat(2, 24px);
  gap: 2px;
  justify-content: center;
  align-content: center;
  backface-visibility: visible;
}

.cube-face span {
  width: 24px;
  height: 24px;
  background: var(--green-light);
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,0.1);
}

.cube-face-front  { transform: translateZ(28px); background: rgba(110,231,183,0.45); }
.cube-face-back   { transform: translateZ(-28px) rotateY(180deg); background: rgba(110,231,183,0.15); }
.cube-face-right  { transform: translateX(28px) rotateY(90deg); background: rgba(110,231,183,0.3); }
.cube-face-left   { transform: translateX(-28px) rotateY(-90deg); background: rgba(110,231,183,0.25); }
.cube-face-top    { transform: translateY(-28px) rotateX(90deg); background: rgba(110,231,183,0.55); }
.cube-face-bottom { transform: translateY(28px) rotateX(-90deg); background: rgba(110,231,183,0.1); }

.visual-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-600);
  text-align: center;
  margin-top: 6px;
}

@media (max-width: 768px) {
  .skill-header {
    padding: 16px 20px;
  }

  .skill-body {
    padding: 16px 20px;
  }

  .skill-example {
    padding: 16px;
  }

  .example-math {
    font-size: 1.3rem;
  }
}