@import "tailwindcss";

:root {
  /* Brand Colors - 中性灰色系 */
  --color-primary: #374151;           /* gray-700 */
  --color-primary-hover: #1f2937;     /* gray-800 */
  --color-primary-light: #f3f4f6;     /* gray-100 */

  /* Accent Color - 仅用于重要强调 */
  --color-accent: #f97316;            /* orange-500 */
  --color-accent-hover: #ea580c;      /* orange-600 */

  /* Semantic Colors */
  --color-success: #22c55e;
  --color-warning: #eab308;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Neutral Colors */
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-border: #e5e7eb;
  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;

  /* Spacing Scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

.dark {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-border: #334155;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
}

/* Focus states for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #f9fafb;
}

.custom-scrollbar::-webkit-scrollbar {
  width: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
  background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 3px;
}

.agent-avatar {
  background: #4b5563;  /* gray-600 */
}

.chat-bubble-assistant {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  border-bottom-left-radius: 4px;
}

.chat-bubble-user {
  background: #374151;  /* gray-700 */
  color: white;
  border-radius: 12px;
  border-bottom-right-radius: 4px;
}

.thinking-dot {
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}