/* Modern Comment System Styles */
:root {
  /* Light theme colors */
  --comment-bg: #ffffff;
  --comment-border: #e2e8f0;
  --comment-text: #2d3748;
  --comment-meta: #718096;
  --comment-hover: #f7fafc;
  --comment-accent: #3182ce;
  --comment-danger: #e53e3e;
  --comment-success: #38a169;
  --comment-warning: #d69e2e;
  
  /* Reaction colors */
  --like-color: #48bb78;
  --like-active: #38a169;
  --dislike-color: #f56565;
  --dislike-active: #e53e3e;
  
  /* Gradients and effects */
  --comment-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Typography */
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* Dark theme overrides */
[data-theme="dark"], .dark-mode {
  --comment-bg: #1a202c;
  --comment-border: #2d3748;
  --comment-text: #e2e8f0;
  --comment-meta: #a0aec0;
  --comment-hover: #2d3748;
  --comment-accent: #63b3ed;
}

/* Main comment container */
.comments-system {
  font-family: var(--font-body);
  color: var(--comment-text);
  line-height: 1.6;
  max-width: 100%;
}

.comments-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--comment-border);
}

.comments-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  background: var(--comment-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.comments-sort {
  display: flex;
  gap: 0.5rem;
}

.sort-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--comment-border);
  background: transparent;
  color: var(--comment-text);
  border-radius: 2rem;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sort-btn:hover {
  background: var(--comment-hover);
  transform: translateY(-1px);
}

.sort-btn.active {
  background: var(--comment-accent);
  color: white;
  border-color: var(--comment-accent);
}

/* Comment form */
.comment-form {
  background: var(--comment-bg);
  border: 1px solid var(--comment-border);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.comment-form:focus-within {
  border-color: var(--comment-accent);
  box-shadow: var(--shadow-md);
}

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

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

.comment-user-info h4 {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 600;
}

.comment-textarea {
  width: 100%;
  min-height: 100px;
  padding: 1rem;
  border: 1px solid var(--comment-border);
  border-radius: 0.75rem;
  background: var(--comment-hover);
  color: var(--comment-text);
  font-family: inherit;
  font-size: 0.875rem;
  line-height: 1.5;
  resize: vertical;
  transition: all 0.2s ease;
}

.comment-textarea:focus {
  outline: none;
  border-color: var(--comment-accent);
  background: var(--comment-bg);
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.comment-textarea::placeholder {
  color: var(--comment-meta);
}

.comment-form-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  gap: 1rem;
}

.comment-char-count {
  font-size: 0.75rem;
  color: var(--comment-meta);
}

.comment-char-count.warning {
  color: var(--comment-warning);
}

.comment-char-count.danger {
  color: var(--comment-danger);
}

.comment-form-buttons {
  display: flex;
  gap: 0.75rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--comment-accent);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: #2c5aa0;
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--comment-text);
  border: 1px solid var(--comment-border);
}

.btn-secondary:hover {
  background: var(--comment-hover);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Comment list */
.comments-list {
  space-y: 1.5rem;
}

.comment-item {
  background: var(--comment-bg);
  border: 1px solid var(--comment-border);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: all 0.3s ease;
  position: relative;
}

.comment-item:hover {
  border-color: var(--comment-accent);
  box-shadow: var(--shadow-md);
}

.comment-item.reply {
  margin-left: 2rem;
  margin-top: 1rem;
  border-left: 3px solid var(--comment-accent);
  border-radius: 0 1rem 1rem 0;
}

.comment-item.reply.level-2 {
  margin-left: 4rem;
}

.comment-item.reply.level-3 {
  margin-left: 6rem;
}

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

.comment-header .comment-avatar {
  width: 48px;
  height: 48px;
}

.comment-item.reply .comment-avatar {
  width: 36px;
  height: 36px;
}

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

.comment-username {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--comment-text);
  text-decoration: none;
}

.comment-username:hover {
  color: var(--comment-accent);
}

.comment-meta {
  font-size: 0.75rem;
  color: var(--comment-meta);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.comment-edited {
  font-style: italic;
}

.comment-content {
  margin-bottom: 1rem;
  line-height: 1.6;
}

.comment-content p {
  margin: 0 0 0.5rem 0;
}

.comment-content p:last-child {
  margin-bottom: 0;
}

.comment-content .mention {
  color: var(--comment-accent);
  font-weight: 600;
  text-decoration: none;
}

.comment-content .mention:hover {
  text-decoration: underline;
}

.comment-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--comment-border);
}

.comment-reaction {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--comment-border);
  background: transparent;
  color: var(--comment-meta);
  border-radius: 1.5rem;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.comment-reaction:hover {
  background: var(--comment-hover);
  transform: scale(1.05);
}

.comment-reaction.active.like {
  background: var(--like-color);
  border-color: var(--like-color);
  color: white;
}

.comment-reaction.active.dislike {
  background: var(--dislike-color);
  border-color: var(--dislike-color);
  color: white;
}

.comment-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--comment-meta);
  font-size: 0.75rem;
  cursor: pointer;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
}

.comment-action-btn:hover {
  background: var(--comment-hover);
  color: var(--comment-text);
}

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

/* Loading states */
.comment-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  color: var(--comment-meta);
}

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--comment-border);
  border-top: 2px solid var(--comment-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Empty state */
.comments-empty {
  text-align: center;
  padding: 3rem;
  color: var(--comment-meta);
}

.comments-empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Pagination */
.comments-pagination {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--comment-border);
}

.load-more-btn {
  padding: 1rem 2rem;
  background: var(--comment-accent);
  color: white;
  border: none;
  border-radius: 2rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.load-more-btn:hover {
  background: #2c5aa0;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Notifications */
.comment-notification {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--comment-bg);
  border: 1px solid var(--comment-border);
  border-radius: 0.75rem;
  padding: 1rem 1.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transform: translateX(100%);
  opacity: 0;
  transition: all 0.3s ease;
}

.comment-notification.show {
  transform: translateX(0);
  opacity: 1;
}

.comment-notification.success {
  border-left: 4px solid var(--comment-success);
}

.comment-notification.error {
  border-left: 4px solid var(--comment-danger);
}

/* Reply form */
.reply-form {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--comment-hover);
  border-radius: 0.75rem;
  border: 1px solid var(--comment-border);
}

.reply-form .comment-textarea {
  min-height: 80px;
  background: var(--comment-bg);
}

/* Responsive design */
@media (max-width: 768px) {
  .comments-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .comments-sort {
    width: 100%;
    justify-content: center;
  }
  
  .comment-form {
    padding: 1rem;
  }
  
  .comment-form-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .comment-form-buttons {
    justify-content: center;
  }
  
  .comment-item {
    padding: 1rem;
  }
  
  .comment-item.reply {
    margin-left: 1rem;
  }
  
  .comment-item.reply.level-2 {
    margin-left: 1.5rem;
  }
  
  .comment-item.reply.level-3 {
    margin-left: 2rem;
  }
  
  .comment-actions {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .comment-notification {
    top: 1rem;
    right: 1rem;
    left: 1rem;
  }
}

@media (max-width: 480px) {
  .comment-form-header {
    flex-direction: column;
    align-items: flex-start;
    text-align: center;
  }
  
  .comment-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
.comment-textarea:focus,
.btn:focus,
.comment-action-btn:focus,
.comment-reaction:focus {
  outline: 2px solid var(--comment-accent);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --comment-border: #000000;
    --comment-text: #000000;
    --comment-bg: #ffffff;
  }
  
  [data-theme="dark"], .dark-mode {
    --comment-border: #ffffff;
    --comment-text: #ffffff;
    --comment-bg: #000000;
  }
}