:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --border-color: #dee2e6;
  --shadow: rgba(0, 0, 0, 0.1);
  --hover-bg: #f8f9fa;
  --primary-color: #0d6efd;
  --danger-color: #dc3545;
  --success-color: #198754;
}

[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-card: #2d2d2d;
  --text-primary: #e4e6eb;
  --text-secondary: #b0b3b8;
  --border-color: #3a3b3c;
  --shadow: rgba(255, 255, 255, 0.1);
  --hover-bg: #3a3b3c;
  --primary-color: #4dabf7;
  --danger-color: #fa5252;
  --success-color: #51cf66;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}

.navbar {
  background-color: var(--bg-card) !important;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 4px var(--shadow);
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary-color) !important;
}

.nav-link {
  color: var(--text-primary) !important;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
}

.nav-link:hover {
  color: var(--primary-color) !important;
}

.theme-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-primary);
  padding: 0.5rem;
}

.profile-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  cursor: pointer;
  border: 2px solid var(--border-color);
}

.profile-avatar:hover {
  border-color: var(--primary-color);
}

.confession-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: box-shadow 0.3s ease, transform 0.2s ease;
}

.confession-card:hover {
  box-shadow: 0 4px 12px var(--shadow);
  transform: translateY(-2px);
}

.confession-header {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.confession-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  margin-right: 12px;
}

.confession-user-info {
  flex: 1;
}

.confession-username {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.confession-meta {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.confession-content {
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.6;
  word-wrap: break-word;
}

.confession-actions {
  display: flex;
  gap: 1rem;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
}

.action-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
  font-size: 0.875rem;
}

.action-btn:hover {
  background-color: var(--hover-bg);
  color: var(--primary-color);
}

.action-btn.liked {
  color: var(--danger-color);
}

.profile-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.profile-avatar-large {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1rem;
  border: 4px solid var(--border-color);
}

.profile-name {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.profile-university {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.confession-input {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.confession-textarea {
  width: 100%;
  min-height: 100px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  resize: vertical;
  font-size: 1rem;
  font-family: inherit;
}

.confession-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.btn-primary {
  background-color: var(--primary-color);
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.btn-primary:hover {
  opacity: 0.9;
  background-color: var(--primary-color);
}

.sidebar-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.sidebar-card h5 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.trending-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.trending-item:last-child {
  border-bottom: none;
}

.trending-item:hover {
  background-color: var(--hover-bg);
  padding-left: 0.5rem;
}

.trending-hashtag {
  font-weight: 600;
  color: var(--primary-color);
  font-size: 1rem;
}

.trending-count {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-top: 3rem;
}

.social-links a {
  color: var(--text-secondary);
  font-size: 1.5rem;
  margin: 0 0.75rem;
  transition: color 0.2s ease;
}

.social-links a:hover {
  color: var(--primary-color);
}

.form-control {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
}

.form-control:focus {
  background-color: var(--bg-primary);
  border-color: var(--primary-color);
  color: var(--text-primary);
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.avatar-selector {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}

.avatar-option {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  cursor: pointer;
  border: 3px solid transparent;
  transition: border-color 0.3s ease, transform 0.2s ease;
}

.avatar-option:hover {
  transform: scale(1.1);
}

.avatar-option.selected {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.2);
}

.chat-container {
  display: flex;
  height: calc(100vh - 200px);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}

.chat-sidebar {
  width: 300px;
  border-right: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.chat-user-item {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: background-color 0.2s ease;
}

.chat-user-item:hover {
  background-color: var(--hover-bg);
}

.chat-user-item.active {
  background-color: var(--primary-color);
  color: white;
}

.chat-messages {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.message {
  margin-bottom: 1rem;
  display: flex;
  gap: 0.75rem;
}

.message.sent {
  flex-direction: row-reverse;
}

.message-bubble {
  max-width: 60%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.message.sent .message-bubble {
  background-color: var(--primary-color);
  color: white;
}

.message-input-container {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 0.75rem;
}

.stats-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.stats-card-compact {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 0.75rem;
  text-align: center;
}

.stat-value-compact {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label-compact {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.hashtag {
  color: var(--primary-color);
  font-weight: 600;
  cursor: pointer;
}

.mention {
  color: var(--primary-color);
  font-weight: 600;
  cursor: pointer;
}

.filter-dropdown {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
}

.loading-spinner {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.unread-badge {
  background-color: var(--danger-color);
  color: white;
  border-radius: 50%;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.card {
  background-color: var(--bg-card);
  border-color: var(--border-color);
}

.text-muted {
  color: var(--text-secondary) !important;
}

@media (max-width: 768px) {
  .chat-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .avatar-selector {
    grid-template-columns: repeat(3, 1fr);
  }

  .confession-actions {
    flex-wrap: wrap;
  }
  
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  #communityStatsCard {
    order: 10;
  }
}