/**
 * 设计令牌 - Design Tokens
 * 定义全局CSS变量，包括颜色、字体、间距、圆角、阴影等
 */

:root {
  /* ========== 颜色系统 - 浅色模式 ========== */
  --color-bg: #ffffff;
  --color-bg-subtle: #f8fafc;
  --color-bg-muted: #f1f5f9;
  --color-bg-elevated: #ffffff;
  
  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;
  --color-border-strong: #cbd5e1;
  
  --color-text: #0f172a;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;
  
  --color-primary: #0f172a;
  --color-primary-hover: #1e293b;
  --color-primary-active: #334155;
  
  --color-success: #16a34a;
  --color-success-bg: #dcfce7;
  --color-success-border: #bbf7d0;
  
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-error-border: #fecaca;
  
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;
  
  --color-info: #2563eb;
  --color-info-bg: #eff6ff;
  --color-info-border: #bfdbfe;

  /* ========== 字体系统 ========== */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
  
  /* 字体大小 */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.8125rem;    /* 13px */
  --text-base: 0.875rem;   /* 14px */
  --text-lg: 1rem;         /* 16px */
  --text-xl: 1.125rem;     /* 18px */
  --text-2xl: 1.25rem;     /* 20px */
  --text-3xl: 1.5rem;      /* 24px */
  --text-4xl: 2rem;        /* 32px */
  
  /* 行高 */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  /* 字重 */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* ========== 间距系统 ========== */
  --space-0: 0;
  --space-1: 0.25rem;      /* 4px */
  --space-2: 0.5rem;       /* 8px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-8: 2rem;         /* 32px */
  --space-10: 2.5rem;      /* 40px */
  --space-12: 3rem;        /* 48px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */

  /* ========== 圆角系统 ========== */
  --radius-none: 0;
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-full: 9999px;

  /* ========== 阴影系统 ========== */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.03);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.04), 0 1px 2px -1px rgb(0 0 0 / 0.04);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.05);

  /* ========== 过渡系统 ========== */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-colors: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);

  /* ========== 尺寸系统 ========== */
  --size-sidebar: 220px;
  --size-sidebar-collapsed: 64px;
  --size-header: 56px;
  --size-input-sm: 32px;
  --size-input-md: 40px;
  --size-input-lg: 48px;
  --size-touch-target: 44px;

  /* ========== 断点 ========== */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;

  /* ========== Z-Index层级 ========== */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-overlay: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

/* ========== 深色模式 ========== */
[data-theme="dark"] {
  --color-bg: #0a0a0b;
  --color-bg-subtle: #111113;
  --color-bg-muted: #18181b;
  --color-bg-elevated: #1c1c1f;
  
  --color-border: #27272a;
  --color-border-subtle: #1c1c1f;
  --color-border-strong: #3f3f46;
  
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-text-inverse: #0a0a0b;
  
  --color-primary: #fafafa;
  --color-primary-hover: #e4e4e7;
  --color-primary-active: #d4d4d8;
  
  --color-success: #22c55e;
  --color-success-bg: #052e16;
  --color-success-border: #166534;
  
  --color-error: #ef4444;
  --color-error-bg: #450a0a;
  --color-error-border: #991b1b;
  
  --color-warning: #f59e0b;
  --color-warning-bg: #451a03;
  --color-warning-border: #92400e;
  
  --color-info: #3b82f6;
  --color-info-bg: #172554;
  --color-info-border: #1e40af;

  /* 深色模式阴影调整 */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.2);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
}

/* ========== 系统偏好深色模式 ========== */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0a0a0b;
    --color-bg-subtle: #111113;
    --color-bg-muted: #18181b;
    --color-bg-elevated: #1c1c1f;
    
    --color-border: #27272a;
    --color-border-subtle: #1c1c1f;
    --color-border-strong: #3f3f46;
    
    --color-text: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-text-inverse: #0a0a0b;
    
    --color-primary: #fafafa;
    --color-primary-hover: #e4e4e7;
    --color-primary-active: #d4d4d8;
    
    --color-success: #22c55e;
    --color-success-bg: #052e16;
    --color-success-border: #166534;
    
    --color-error: #ef4444;
    --color-error-bg: #450a0a;
    --color-error-border: #991b1b;
    
    --color-warning: #f59e0b;
    --color-warning-bg: #451a03;
    --color-warning-border: #92400e;
    
    --color-info: #3b82f6;
    --color-info-bg: #172554;
    --color-info-border: #1e40af;

    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.2);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
  }
}