/* =============================================
   GRAMMAR COURSE PAGE STYLES
   ============================================= */

/* Section heading */
.grammar-section-title {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--dark);
  margin: 36px 0 8px;
}

/* ---- 20 Topic Cards Grid ---- */
.grammar-topics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.grammar-topic-card {
  background: var(--tc, #EFF6FF);
  border-radius: 14px;
  padding: 20px 16px 18px;
  position: relative;
  border-top: 4px solid var(--tb, #3B82F6);
  transition: all 0.25s ease;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}
.grammar-topic-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.12);
}

.gtc-num {
  position: absolute;
  top: 12px;
  right: 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--tb, #3B82F6);
  opacity: 0.35;
  line-height: 1;
}
.gtc-icon {
  font-size: 1.9rem;
  margin-bottom: 10px;
  display: block;
}
.grammar-topic-card h4 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--dark);
  margin-bottom: 6px;
  line-height: 1.3;
}
.grammar-topic-card p {
  font-size: 0.8rem;
  color: #6B7280;
  line-height: 1.5;
}

/* ---- Teaching Methods Grid ---- */
.grammar-methods-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.grammar-method-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 22px;
  box-shadow: 0 3px 14px rgba(0,0,0,0.07);
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: all 0.25s;
}
.grammar-method-card:hover { transform: translateY(-3px); }
.gm-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}
.grammar-method-card h4 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  color: var(--dark);
  margin-bottom: 6px;
}
.grammar-method-card p {
  font-size: 0.88rem;
  color: #6B7280;
  line-height: 1.6;
}

/* ---- Topic Glance List (Sidebar) ---- */
.topic-glance-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 4px;
}
.topic-glance-list::-webkit-scrollbar { width: 4px; }
.topic-glance-list::-webkit-scrollbar-track { background: #F3F4F6; border-radius: 4px; }
.topic-glance-list::-webkit-scrollbar-thumb { background: #D1D5DB; border-radius: 4px; }

.tgl-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--text);
  font-weight: 600;
}
.tgl-num {
  width: 26px; height: 26px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 0.78rem;
  flex-shrink: 0;
}

/* ---- Sample Exercise Box ---- */
.grammar-exercise-box {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 40px;
  box-shadow: 0 4px 24px rgba(59,130,246,0.12);
  border: 2px solid #BFDBFE;
  max-width: 780px;
  margin: 36px auto 0;
}
.exercise-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 10px;
}
.exercise-tag {
  background: #EFF6FF;
  color: #1D4ED8;
  font-weight: 800;
  font-size: 0.85rem;
  padding: 6px 16px;
  border-radius: 50px;
  border: 1px solid #BFDBFE;
}
.exercise-level {
  background: #F0FFF4;
  color: #16A34A;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 5px 14px;
  border-radius: 50px;
}
.grammar-exercise-box h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--dark);
  margin-bottom: 20px;
}
.exercise-sentences {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}
.exercise-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 1rem;
  color: var(--text);
  line-height: 1.7;
}
.ex-num {
  font-weight: 800;
  color: #3B82F6;
  flex-shrink: 0;
  width: 20px;
}
.fill-blank {
  display: inline-block;
  border-bottom: 2.5px solid #3B82F6;
  min-width: 80px;
  color: #3B82F6;
  font-weight: 700;
  padding: 0 4px;
  font-style: italic;
}
.exercise-hint {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 0.88rem;
  color: #6B7280;
  line-height: 1.6;
}
.exercise-hint i { flex-shrink: 0; margin-top: 2px; }
.exercise-hint strong { color: var(--dark); }

/* ---- Responsive ---- */
@media (max-width: 1100px) {
  .grammar-topics-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .grammar-topics-grid { grid-template-columns: repeat(2, 1fr); }
  .grammar-methods-grid { grid-template-columns: 1fr; }
  .grammar-exercise-box { padding: 24px 20px; }
}
@media (max-width: 480px) {
  .grammar-topics-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .grammar-topic-card { padding: 14px 12px 14px; }
  .gtc-icon { font-size: 1.5rem; }
  .grammar-topic-card h4 { font-size: 0.85rem; }
  .grammar-topic-card p { display: none; }
}