/* Bilikids Teens Cambridge B2 First Styles */

:root {
  --cb-primary: #7c3aed;
  --cb-primary-dark: #6d28d9;
  --cb-accent: #0ea5e9;
  --cb-bg: #fdf4ff;
  --cb-card: #ffffff;
  --cb-border: #f0abfc;
  --cb-text: #1e1b4b;
}

body.cambridge-body {
  background: linear-gradient(180deg, #faf5ff 0%, #fdf4ff 100%);
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.cambridge-container {
  max-width: 1080px;
  margin: 1.5rem auto 3rem;
  padding: 0 1.25rem;
  width: 100%;
  box-sizing: border-box;
}

/* Part Tabs Bar */
.cambridge-parts-nav {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
  scrollbar-width: thin;
}

.cambridge-part-btn {
  background: #ffffff;
  border: 1.5px solid #e9d5ff;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  color: #6b21a8;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.cambridge-part-btn:hover {
  border-color: var(--cb-primary);
  background: #fdf4ff;
}

.cambridge-part-btn.active {
  background: var(--cb-primary);
  border-color: var(--cb-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

/* Exercise Header Card */
.cambridge-header-box {
  background: #ffffff;
  border: 1.5px solid #e9d5ff;
  border-radius: 24px;
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.06);
}

.cambridge-badge {
  display: inline-block;
  background: #f3e8ff;
  color: #7e22ce;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 0.5rem;
}

.cambridge-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: #3b0764;
}

.cambridge-desc {
  margin: 0.5rem 0 1rem;
  font-size: 1rem;
  line-height: 1.5;
  color: #475569;
}

.cambridge-ex-selector {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  border-top: 1px solid #f3e8ff;
  padding-top: 1rem;
}

.ex-pill-btn {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  transition: all 0.2s;
}

.ex-pill-btn:hover {
  background: #f1f5f9;
}

.ex-pill-btn.active {
  background: #7e22ce;
  border-color: #7e22ce;
  color: #ffffff;
}

/* Exercise Body Card */
.cambridge-exercise-card {
  background: #ffffff;
  border: 1.5px solid #e9d5ff;
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.06);
}

.exercise-headline {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: #1e1b4b;
}

.cambridge-text-passage {
  font-size: 1.12rem;
  line-height: 2.2;
  color: #1e293b;
  background: #fcfaff;
  padding: 1.75rem;
  border-radius: 18px;
  border: 1px solid #fae8ff;
  margin-bottom: 1.5rem;
}

/* Gap Select & Inputs */
.cambridge-gap-select {
  display: inline-block;
  background: #ffffff;
  border: 2px solid #a855f7;
  color: #6b21a8;
  font-weight: 700;
  font-size: 1rem;
  padding: 4px 8px;
  border-radius: 8px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s;
}

.cambridge-gap-select.correct {
  border-color: #10b981 !important;
  background: #dcfce7 !important;
  color: #065f46 !important;
}

.cambridge-gap-select.incorrect {
  border-color: #ef4444 !important;
  background: #fee2e2 !important;
  color: #991b1b !important;
}

.cambridge-gap-input {
  display: inline-block;
  background: #ffffff;
  border: 2px solid #a855f7;
  color: #1e293b;
  font-weight: 700;
  font-size: 1rem;
  padding: 4px 10px;
  border-radius: 8px;
  width: 110px;
  outline: none;
  transition: all 0.2s;
  text-align: center;
}

.cambridge-gap-input:focus {
  box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.2);
}

.cambridge-gap-input.correct {
  border-color: #10b981 !important;
  background: #dcfce7 !important;
  color: #065f46 !important;
}

.cambridge-gap-input.incorrect {
  border-color: #ef4444 !important;
  background: #fee2e2 !important;
  color: #991b1b !important;
}

/* Word formation root tag */
.wf-inline-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #fdf4ff;
  padding: 2px 6px;
  border-radius: 10px;
  border: 1px solid #f0abfc;
}

.wf-root-tag {
  font-size: 0.8rem;
  font-weight: 800;
  color: #a21caf;
  background: #fae8ff;
  padding: 2px 6px;
  border-radius: 6px;
  letter-spacing: 0.05em;
}

/* Part 4 Key Word Transformations */
.kwt-list-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.kwt-box {
  background: #fdfaff;
  border: 1.5px solid #f3e8ff;
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
}

.kwt-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.kwt-num {
  font-size: 0.82rem;
  font-weight: 700;
  color: #64748b;
  text-transform: uppercase;
}

.kwt-keyword {
  background: #7e22ce;
  color: #ffffff;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  padding: 3px 12px;
  border-radius: 999px;
}

.kwt-first-sentence {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #1e1b4b;
}

.kwt-second-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 1.05rem;
  color: #334155;
}

.kwt-input {
  flex-grow: 1;
  min-width: 220px;
  background: #ffffff;
  border: 2px solid #c084fc;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 1rem;
  font-weight: 600;
  outline: none;
  color: #0f172a;
}

.kwt-input:focus {
  border-color: #7e22ce;
  box-shadow: 0 0 0 3px rgba(126, 34, 206, 0.15);
}

.kwt-input.correct {
  border-color: #10b981 !important;
  background: #dcfce7 !important;
}

.kwt-input.incorrect {
  border-color: #ef4444 !important;
  background: #fee2e2 !important;
}

/* Action strip */
.cambridge-action-strip {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.cambridge-cta-btn {
  background: var(--cb-primary);
  color: #ffffff;
  border: none;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.35);
  transition: all 0.2s;
}

.cambridge-cta-btn:hover {
  background: var(--cb-primary-dark);
  transform: translateY(-2px);
}

.cambridge-feedback-msg {
  font-size: 1.05rem;
  color: #4338ca;
  background: #e0e7ff;
  padding: 8px 16px;
  border-radius: 999px;
}

/* Explanations List */
.cambridge-explanations-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed #e2e8f0;
}

.cambridge-explanations-list h4 {
  margin: 0;
  font-size: 1.05rem;
  color: #1e1b4b;
}

.expl-item {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.92rem;
}

.expl-item.good {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
}

.expl-item.bad {
  background: #fef2f2;
  border: 1px solid #fecaca;
}

@media (max-width: 768px) {
  .cambridge-parts-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    overflow: visible;
    gap: 8px;
  }

  .cambridge-part-btn {
    min-width: 0;
    justify-content: center;
    text-align: center;
    white-space: normal;
    line-height: 1.2;
    padding: 10px 8px;
    min-height: 48px;
    font-size: 0.8rem;
  }
}