/* ═══════════════════════════════════════════════════════════
   DreamEra — problems.css
   Specific styles for the Problems & Solutions feed page
   ═══════════════════════════════════════════════════════════ */

/* ── Filter Section ── */
.filter-section {
  position: sticky;
  top: var(--nav-height);
  z-index: 90;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.filter-bar {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-2);
  margin-bottom: var(--space-4);
}

.search-box {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  color: var(--color-text-muted);
}

.search-box .form-input {
  padding-left: var(--space-10);
  background: var(--color-bg-primary);
  border: none;
}

.filter-controls {
  display: flex;
  gap: var(--space-3);
}

.filter-controls .form-select {
  min-width: 150px;
  background: var(--color-bg-primary);
  border: none;
}

.results-count {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ── Feed Section ── */
.feed-section {
  padding-top: var(--space-8);
  min-height: 50vh;
}

#problemsFeed {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* ── Problem Card ── */
.problem-card {
  position: relative;
  overflow: hidden;
  border-left-width: 4px;
}

.problem-card.status-open {
  border-left-color: var(--color-danger);
}

.problem-card.status-progress {
  border-left-color: var(--color-warning);
}

.problem-card.status-solved {
  border-left-color: var(--color-accent);
}

.problem-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-4);
}

.problem-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.problem-id {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-dim);
}

.problem-submitter {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.problem-title {
  margin-bottom: var(--space-3);
}

.problem-desc {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.problem-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.problem-tags {
  display: flex;
  gap: var(--space-3);
}

.problem-tag {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ── Solutions Section ── */
.solutions-container {
  margin-top: var(--space-4);
  background: var(--color-bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.solutions-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-surface-alt);
  cursor: pointer;
  user-select: none;
}

.solutions-title {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.solutions-toggle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: transform var(--duration-fast);
}

.solutions-container.expanded .solutions-toggle {
  transform: rotate(180deg);
}

.solutions-list {
  display: none;
  padding: var(--space-4);
}

.solutions-container.expanded .solutions-list {
  display: block;
}

.solution-item {
  display: flex;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.solution-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.solution-icon {
  color: var(--color-accent);
  font-size: 1.2rem;
  margin-top: 2px;
}

.solution-content {
  flex: 1;
}

.solution-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  line-height: var(--leading-relaxed);
}

.solution-meta {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-dim);
}

/* ── Add Solution Form ── */
.add-solution-form {
  display: none;
  padding: var(--space-4);
  background: var(--color-bg-surface-alt);
  border-top: 1px solid var(--color-border);
}

.add-solution-form.active {
  display: block;
}

.add-solution-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: var(--space-12) 0;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.empty-state p {
  color: var(--color-text-muted);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .filter-bar {
    flex-direction: column;
  }
  
  .filter-controls {
    width: 100%;
  }
  
  .filter-controls .form-select {
    flex: 1;
  }
  
  .problem-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }
}