/* Statistics Page Styles - Base Layout */

/* Main Grid Container */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

/* Card Components */
.stats-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stats-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

/* Main Value Display (Big Numbers) */
.stats-main-value {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 1rem 0;
}

.stats-main-number {
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--accent-primary);
  line-height: 1;
}

.stats-main-unit {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Progress Bar Styles */
.stats-progress-bar-bg {
  width: 100%;
  height: 12px;
  background-color: var(--bg-tertiary);
  border-radius: 6px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.stats-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 6px;
  transition: width 0.5s ease;
}

/* Helper Text */
.stats-helper-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0.5rem 0 0 0;
}

/* Last Study Date */
.stats-last-study {
  font-weight: 600;
  color: var(--accent-primary);
}

/* Section Block (Container for sections) */
.stats-section-block {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stats-section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-primary);
}

/* Category Rows (by-category section) */
.stats-rows {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.stats-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.stats-row-label {
  min-width: 100px;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.stats-row-bar {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stats-row-bar-bg {
  flex: 1;
  height: 10px;
  background-color: var(--bg-tertiary);
  border-radius: 5px;
  overflow: hidden;
}

.stats-row-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 5px;
  transition: width 0.5s ease;
}

.stats-row-meta {
  display: flex;
  gap: 1rem;
  min-width: 140px;
  justify-content: flex-end;
}

.stats-row-count {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.stats-row-percent {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
  min-width: 35px;
  text-align: right;
}

/* Two Column Layout for Word Mastery & Grammar */
.stats-section-two-col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

/* Empty State */
.stats-empty {
  color: var(--text-secondary);
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.9rem;
}

/* Responsive Design - Base Layout */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stats-section-two-col {
    grid-template-columns: 1fr;
  }

  .stats-main-number {
    font-size: 2.5rem;
  }
}

@media (max-width: 640px) {
  .stats-card {
    padding: 1rem;
  }

  .stats-main-number {
    font-size: 2rem;
  }

  .stats-row-label {
    min-width: 80px;
    font-size: 0.85rem;
  }

  .stats-row-meta {
    min-width: 100px;
  }

  .stats-row-count {
    font-size: 0.75rem;
  }

  .stats-row-percent {
    font-size: 0.75rem;
  }
}