/**
 * ============================================================================
 * PAPERSENSE STYLES
 * ============================================================================
 *
 * Styles for the PaperSense topic prediction engine page.
 * Depends on: mainstyles.css, privacypolicy.css (for .privacy-layout etc.)
 * ============================================================================
 */

/* ==================== PAGE HEADER OVERRIDE ==================== */

.ps-page-header {
  padding: 60px 20px 110px;
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #4338ca 100%);
  text-align: center;
  color: white;
}

.ps-breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

.ps-breadcrumb a {
  color: white;
  text-decoration: none;
  opacity: 0.8;
}

.ps-breadcrumb a:hover {
  opacity: 1;
}

.ps-breadcrumb .sep {
  opacity: 0.5;
}

.ps-header-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  opacity: 0.9;
}

.ps-header-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin: 0 0 var(--spacing-sm);
  letter-spacing: -0.5px;
}

.ps-header-subtitle {
  font-size: var(--font-size-lg);
  opacity: 0.85;
  margin: 0;
}

/* ==================== LAYOUT OVERRIDES ==================== */

/* Override privacy-content padding for PaperSense */
#papersenseContent.privacy-content {
  padding: var(--spacing-2xl) var(--spacing-xl);
}

/* ==================== SIDEBAR CONTENT ==================== */

.ps-nav-subject {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.ps-nav-level {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin: 0 0 var(--spacing-xs);
}

.ps-nav-name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 var(--spacing-xs);
  line-height: 1.2;
}

.ps-nav-syllabus {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin: 0;
}

/* Confidence chip */
.ps-confidence-row {
  margin-bottom: var(--spacing-lg);
}

.ps-confidence-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin: 0 0 var(--spacing-xs);
}

.ps-confidence-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.ps-confidence-chip i {
  font-size: 0.75rem;
}

.ps-confidence--low {
  background: #fef3c7;
  color: #92400e;
}

.ps-confidence--medium {
  background: #dbeafe;
  color: #1e40af;
}

.ps-confidence--high {
  background: #d1fae5;
  color: #065f46;
}

/* Sessions info */
.ps-sessions-info {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.ps-sessions-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin: 0 0 var(--spacing-sm);
}

.ps-sessions-count {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-dark);
  display: block;
  margin-bottom: 2px;
}

.ps-sessions-range {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Section navigation in sidebar */
.ps-section-nav-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin: 0 0 var(--spacing-sm);
}

.ps-section-nav-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--spacing-xl);
}

.ps-section-nav-item {
  margin-bottom: 2px;
}

.ps-section-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
  cursor: pointer;
}

.ps-section-nav-link:hover {
  background: #eef2ff;
  color: #4338ca;
  border-left-color: #4338ca;
}

.ps-section-nav-link.active {
  background: #eef2ff;
  color: #4338ca;
  font-weight: 600;
  border-left-color: #4338ca;
}

.ps-section-nav-link i {
  font-size: 0.8rem;
  width: 14px;
  text-align: center;
}

/* Back link */
.ps-back-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-xl);
  border: 1px solid var(--border-color);
}

.ps-back-link:hover {
  background: var(--background);
  color: var(--text-dark);
  border-color: var(--text-muted);
}

/* Disclaimer in sidebar */
.ps-disclaimer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  line-height: 1.6;
}

.ps-disclaimer i {
  color: #f59e0b;
  margin-right: 4px;
}

/* ==================== CONTENT AREA ==================== */

.ps-content-header {
  margin-bottom: var(--spacing-2xl);
}

.ps-content-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.ps-content-title i {
  color: #4338ca;
}

/* Summary chips row */
.ps-summary-bar {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.ps-stat-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 5px 12px;
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  font-weight: 500;
}

.ps-stat-chip i {
  color: #4338ca;
  font-size: 0.8rem;
}

/* Notice box */
.ps-notice {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: #fefce8;
  border: 1px solid #fde68a;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-2xl);
  font-size: var(--font-size-sm);
  color: #78350f;
  line-height: 1.6;
}

.ps-notice i {
  font-size: var(--font-size-lg);
  color: #f59e0b;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==================== SECTION GROUPS ==================== */

.ps-section-group {
  margin-bottom: var(--spacing-3xl);
  scroll-margin-top: 120px;
}

.ps-section-heading {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 3px solid #4338ca;
}

.ps-section-heading i {
  color: #4338ca;
  font-size: var(--font-size-lg);
}

/* ==================== TOPIC GRID ==================== */

.ps-topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--spacing-md);
}

/* ==================== TOPIC CARDS ==================== */

.ps-topic-card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.ps-topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Top row: topic name + badge */
.ps-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.ps-topic-name {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-dark);
  line-height: 1.3;
  flex: 1;
}

/* Score bar */
.ps-score-bar-track {
  background: var(--background);
  border-radius: var(--radius-full);
  height: 6px;
  overflow: hidden;
}

.ps-score-bar {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
  min-width: 4px;
}

/* Score bar colours by label (via data-label on card) */
.ps-topic-card[data-label="overdue"] .ps-score-bar {
  background: #dc2626;
}
.ps-topic-card[data-label="hot"] .ps-score-bar {
  background: #f97316;
}
.ps-topic-card[data-label="moderate"] .ps-score-bar {
  background: #3b82f6;
}
.ps-topic-card[data-label="cold"] .ps-score-bar {
  background: #64748b;
}
.ps-topic-card[data-label="rare"] .ps-score-bar {
  background: #8b5cf6;
}
.ps-topic-card[data-label="unseen"] .ps-score-bar {
  background: #d1d5db;
}

/* Meta row: sessions, last seen, question count */
.ps-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

.ps-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ps-card-meta i {
  color: #6366f1;
  font-size: 0.7rem;
}

/* ==================== BADGES ==================== */

.ps-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}

.ps-badge--overdue {
  background: #fee2e2;
  color: #991b1b;
}

.ps-badge--hot {
  background: #ffedd5;
  color: #9a3412;
}

.ps-badge--moderate {
  background: #dbeafe;
  color: #1e40af;
}

.ps-badge--cold {
  background: #f1f5f9;
  color: #475569;
}

.ps-badge--rare {
  background: #f3e8ff;
  color: #6b21a8;
}

.ps-badge--unseen {
  background: #f3f4f6;
  color: #6b7280;
}

/* ==================== LOADING STATE ==================== */

.ps-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px var(--spacing-lg);
  color: var(--text-muted);
  text-align: center;
  gap: var(--spacing-lg);
}

.ps-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: #4338ca;
  border-radius: 50%;
  animation: ps-spin 0.8s linear infinite;
}

@keyframes ps-spin {
  to {
    transform: rotate(360deg);
  }
}

.ps-loading p {
  margin: 0;
  font-size: var(--font-size-base);
  color: var(--text-muted);
}

/* ==================== EMPTY / ERROR / NO DATA ==================== */

.ps-state-card {
  text-align: center;
  padding: 60px var(--spacing-xl);
  background: var(--surface);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
}

.ps-state-icon {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--border-color);
}

.ps-state-card h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 var(--spacing-sm);
}

.ps-state-card p {
  font-size: var(--font-size-base);
  color: var(--text-muted);
  margin: 0 0 var(--spacing-xl);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.ps-state-card .ps-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-xl);
  background: #4338ca;
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: background var(--transition-fast);
}

.ps-state-card .ps-btn:hover {
  background: #3730a3;
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 968px) {
  .privacy-layout {
    grid-template-columns: 1fr;
  }

  #papersenseNav.privacy-nav {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-xl);
  }

  .ps-section-nav-list {
    display: none;
  }

  .ps-topic-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

@media (max-width: 640px) {
  .ps-page-header {
    padding: 40px 20px 90px;
  }
  .ps-header-title {
    font-size: var(--font-size-3xl);
  }

  #papersenseContent.privacy-content {
    padding: var(--spacing-lg);
  }

  .ps-topic-grid {
    grid-template-columns: 1fr;
  }

  .ps-summary-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}