/* =========================================================
   HIGHLAND EXPEDITIONARY ROVER - CURRICULUM STYLES
   Theme: Precision Telemetry & Tactical Progress Scheme
   ========================================================= */

.curriculum-section {
  padding: 80px 0;
  position: relative;
  border-bottom: 1px solid rgba(40, 48, 57, 0.6);
}

/* Language Selection Bar */
.curriculum-lang-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.curriculum-lang-btn {
  background: var(--color-surface-card);
  border: 1px solid var(--color-slate-border);
  color: var(--color-mist-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.curriculum-lang-btn:hover {
  border-color: var(--color-gold-insignia);
  color: #ffffff;
}

.curriculum-lang-btn.active {
  background: var(--color-crimson-heritage);
  border-color: var(--color-gold-insignia);
  color: #ffffff;
  box-shadow: 0 0 12px rgba(158, 27, 30, 0.5);
}

/* Overall Progress Card */
.curriculum-progress-summary {
  background: var(--color-surface-low);
  border: 1px solid var(--color-slate-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 32px;
}

.progress-summary-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 8px;
}

.progress-summary-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-highland-mist);
  display: flex;
  align-items: center;
  gap: 8px;
}

.progress-summary-title i {
  color: var(--color-gold-insignia);
}

.progress-summary-pct {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-gold-insignia);
  letter-spacing: 0.04em;
}

.curriculum-progress-bar {
  height: 8px;
  background: var(--color-surface-lowest);
  border: 1px solid var(--color-slate-border);
  border-radius: var(--radius-xs);
  overflow: hidden;
  position: relative;
}

.curriculum-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-crimson-heritage), var(--color-gold-insignia));
  transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 10px rgba(212, 175, 55, 0.4);
}

/* Stage Navigation and Detail Card Layout */
.curriculum-layout-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  margin-bottom: 40px;
}

@media (max-width: 900px) {
  .curriculum-layout-grid {
    grid-template-columns: 1fr;
  }
}

/* Stage Tabs Navigation */
.curriculum-stage-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stage-nav-item {
  background: var(--color-surface-card);
  border: 1px solid var(--color-slate-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.stage-nav-item:hover {
  border-color: rgba(212, 175, 55, 0.4);
  background: var(--color-surface-high);
}

.stage-nav-item.active {
  background: var(--color-surface-high);
  border-color: var(--color-gold-insignia);
  box-shadow: var(--shadow-gold-glow);
}

.stage-nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-gold-insignia);
  border-radius: var(--radius-xs) 0 0 var(--radius-xs);
}

.stage-nav-badge {
  font-size: 1.4rem;
  flex-shrink: 0;
}

.stage-nav-text {
  flex: 1;
}

.stage-nav-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-gold-insignia);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: block;
}

.stage-nav-title {
  font-family: var(--font-editorial);
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  display: block;
  line-height: 1.25;
}

.stage-nav-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--color-slate-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: transparent;
  transition: all 0.2s ease;
}

.stage-nav-check.completed {
  background: var(--color-forest-pine);
  border-color: var(--color-gold-insignia);
  color: var(--color-gold-bright);
}

/* Stage Dynamic Content Card */
.curriculum-stage-card {
  background: var(--color-surface-low);
  border: 1px solid var(--color-slate-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.stage-card-hero {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-slate-border);
}

.stage-hero-badge {
  font-size: 2.2rem;
  flex-shrink: 0;
}

.stage-hero-details {
  flex: 1;
}

.stage-hero-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-gold-insignia);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.stage-hero-title {
  font-family: var(--font-editorial);
  font-size: 24px;
  color: #ffffff;
  margin-bottom: 4px;
}

.stage-hero-motto {
  font-size: 13px;
  color: var(--color-mist-subtle);
  font-style: italic;
}

.stage-card-desc {
  font-size: 14px;
  color: var(--color-mist-subtle);
  margin-bottom: 24px;
  line-height: 1.6;
}

.stage-requirements-header {
  margin-bottom: 16px;
}

.stage-requirements-header h4 {
  font-family: var(--font-headlines);
  font-size: 15px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.stage-req-sub {
  font-size: 12px;
  color: var(--color-mist-dim);
}

.stage-req-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.req-item-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-slate-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: all 0.2s ease;
}

.req-item-card:hover {
  border-color: rgba(212, 175, 55, 0.3);
}

.req-item-card.completed {
  border-color: rgba(30, 56, 43, 0.9);
  background: rgba(30, 56, 43, 0.15);
}

.req-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
}

.req-checkbox-label input {
  display: none;
}

.req-custom-box {
  width: 18px;
  height: 18px;
  border: 1px solid var(--color-slate-border);
  border-radius: var(--radius-xs);
  background: var(--color-surface-lowest);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: transparent;
  flex-shrink: 0;
  margin-top: 3px;
  transition: all 0.15s ease;
}

.req-checkbox-label input:checked + .req-custom-box {
  background: var(--color-crimson-heritage);
  border-color: var(--color-gold-insignia);
  color: var(--color-gold-bright);
}

.req-text-box {
  flex: 1;
}

.req-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 2px;
}

.req-title {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
}

.req-item-card.completed .req-title {
  color: var(--color-gold-bright);
}

.req-category-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-mist-subtle);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-slate-border);
}

.req-desc {
  font-size: 12px;
  color: var(--color-mist-subtle);
  line-height: 1.5;
}

.stage-footer-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 16px;
  border-top: 1px solid var(--color-slate-border);
}