/* ============================================
   Design System - CSS Variables & Tokens
   极致现代设计系统
   ============================================ */

:root {
  /* ---- Color Palette ---- */
  --color-primary: #07c160;
  --color-primary-light: #38d97a;
  --color-primary-dark: #059748;
  --color-primary-50: rgba(7, 193, 96, 0.05);
  --color-primary-100: rgba(7, 193, 96, 0.1);
  --color-primary-200: rgba(7, 193, 96, 0.2);
  --color-primary-300: rgba(7, 193, 96, 0.3);

  --color-accent: #1e90ff;
  --color-accent-light: #4da6ff;
  --color-accent-dark: #1570cc;
  --color-accent-50: rgba(30, 144, 255, 0.05);
  --color-accent-100: rgba(30, 144, 255, 0.1);
  --color-accent-200: rgba(30, 144, 255, 0.2);

  --color-danger: #ff4757;
  --color-danger-light: #ff6b7a;
  --color-danger-dark: #e63e4d;
  --color-danger-bg: #fff2f0;
  --color-danger-border: #ffccc7;

  --color-warning: #ffb020;
  --color-warning-bg: #fffbe6;
  --color-warning-border: #ffe58f;

  --color-success: #10b981;
  --color-success-bg: #f0fdf4;

  /* ---- Neutral Colors ---- */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #eeeeee;
  --color-gray-300: #e0e0e0;
  --color-gray-400: #bdbdbd;
  --color-gray-500: #9e9e9e;
  --color-gray-600: #757575;
  --color-gray-700: #616161;
  --color-gray-800: #424242;
  --color-gray-900: #1a1a1a;

  /* ---- Background Colors ---- */
  --bg-app: #ebebeb;
  --bg-chat: #ebebeb;
  --bg-input: #f6f6f6;
  --bg-card: var(--color-white);
  --bg-overlay: rgba(0, 0, 0, 0.4);
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-strong: rgba(255, 255, 255, 0.96);

  /* ---- Message Bubbles ---- */
  --bubble-own: #95ec69;
  --bubble-own-text: #000000;
  --bubble-other: #ffffff;
  --bubble-other-text: #1a1a1a;
  --bubble-ai: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bubble-ai-text: #ffffff;
  --bubble-thinking-bg: #f5f5f5;
  --bubble-thinking-text: #666666;

  /* ---- Typography ---- */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial,
    sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Consolas',
    'Monaco', 'Courier New', monospace;

  --text-xs: 0.6875rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* ---- Spacing ---- */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* ---- Border Radius ---- */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* ---- Shadows ---- */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1), 0 8px 16px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 20px var(--color-primary-200);
  --shadow-glow-accent: 0 0 20px var(--color-accent-200);

  /* ---- Transitions ---- */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-spring: cubic-bezier(0.25, 0.46, 0.45, 0.94);

  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 350ms;

  /* ---- Z-Index Scale ---- */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 500;
  --z-modal: 1000;
  --z-popover: 1500;
  --z-toast: 2000;
  --z-max: 9999;

  /* ---- Layout ---- */
  --app-max-width: 480px;
  --input-min-height: 44px;
  --header-height: 0px;

  /* ---- Safe Areas ---- */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);

  /* ---- Viewport ---- */
  --vh: 1vh;
}

/* ---- Dark Mode ---- */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-app: #111111;
    --bg-chat: #111111;
    --bg-input: #1a1a1a;
    --bg-card: #1e1e1e;
    --bg-overlay: rgba(0, 0, 0, 0.6);
    --bg-glass: rgba(28, 28, 28, 0.92);
    --bg-glass-strong: rgba(28, 28, 28, 0.98);

    --bubble-own: #275e3a;
    --bubble-own-text: #ffffff;
    --bubble-other: #262626;
    --bubble-other-text: #e8e8e8;
    --bubble-thinking-bg: #262626;
    --bubble-thinking-text: #999999;

    --color-gray-50: #1a1a1a;
    --color-gray-100: #222222;
    --color-gray-200: #2e2e2e;
    --color-gray-300: #3a3a3a;
    --color-gray-400: #555555;
    --color-gray-500: #808080;
    --color-gray-600: #aaaaaa;
    --color-gray-700: #cccccc;
    --color-gray-800: #e0e0e0;
    --color-gray-900: #f0f0f0;

    --color-success-bg: rgba(16, 185, 129, 0.15);
    --color-danger-bg: rgba(255, 71, 87, 0.15);
    --color-danger-border: #5c2626;
    --color-warning-bg: rgba(255, 176, 32, 0.15);
    --color-warning-border: #5c4a1a;

    --shadow-xs: none;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 16px 40px rgba(0, 0, 0, 0.5);
  }
}