/* ═══════════════════════════════════════════════════════════════
   PYQ Frequency Analyzer
═══════════════════════════════════════════════════════════════ */

.pf-filter-bar {
  display: grid;
  grid-template-columns: auto 1fr 220px;
  gap: var(--space-3);
  align-items: end;
  margin-bottom: var(--space-4);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: 10px;
}

@media (max-width: 700px) {
  .pf-filter-bar { grid-template-columns: 1fr; }
}

.pf-filter-group { min-width: 0; }

.pf-filter-label {
  display: block;
  font-size: 11px;
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.pf-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.pf-tab {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: var(--font-semibold);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all 0.12s;
  font-family: var(--font-body);
}

.pf-tab:hover {
  border-color: var(--color-text-muted);
}

.pf-tab--active {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: #fff;
}

.pf-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-3);
  max-width: 100%;
}

@media (min-width: 1100px) {
  .pf-results-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 360px));
    justify-content: start;
  }
}

@media (max-width: 500px) {
  .pf-results-grid { grid-template-columns: 1fr; }
}

.pf-topic-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: 10px;
  padding: var(--space-3) var(--space-4);
  transition: box-shadow 0.15s, transform 0.15s;
}

.pf-topic-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}

.pf-topic-card--high {
  background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
  border-color: #fde047;
}

.pf-topic-card--very-high {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  border-color: #fca5a5;
}

.pf-topic-card__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 6px;
}

.pf-topic-card__name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  line-height: 1.3;
  flex: 1;
  min-width: 0;
}

.pf-topic-card__count {
  flex-shrink: 0;
  background: var(--color-brand);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: var(--font-bold);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  white-space: nowrap;
}

.pf-topic-card--high .pf-topic-card__count {
  background: #d97706;
}

.pf-topic-card--very-high .pf-topic-card__count {
  background: #dc2626;
}

.pf-topic-card__meta {
  font-size: 11px;
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
}

.pf-topic-card__papers {
  font-family: var(--font-mono);
}

.pf-topic-card__years {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-muted);
}

.pf-topic-card__subtopics {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--color-border-light);
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.pf-subtopic-pill {
  font-size: 10px;
  padding: 2px 7px;
  background: var(--color-bg-alt);
  border-radius: 8px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.pf-empty {
  text-align: center;
  padding: var(--space-8);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* Comprehensive mobile fixes */
@media (max-width: 500px) {
  .pf-filter-bar { padding: var(--space-2); gap: var(--space-2); }
  .pf-tab { padding: 5px 10px; font-size: 11px; }
  .pf-tabs { gap: 3px; }
  .pf-filter-label { font-size: 10px; }

  .pf-topic-card { padding: var(--space-3); }
  .pf-topic-card__name { font-size: 13px; }
  .pf-topic-card__count { padding: 2px 8px; font-size: 10px; }
  .pf-topic-card__meta { font-size: 10px; gap: 6px; }
  .pf-topic-card__years { font-size: 9px; }
  .pf-subtopic-pill { font-size: 9px; padding: 1px 6px; }
}