[CLAUDE] FE: content polish — typography + PageHeader + Button/Input/Table

Typography base (both apps):
- 14px base, line-height 1.55, letter-spacing -0.003em — Be Vietnam
  Pro render chắc hơn, dấu tiếng Việt rõ hơn
- h1/h2 tracking tighter (-0.018em), h1 weight 700, h2 weight 600
- Tabular numbers trong <table> (tự động align cột số)

PageHeader:
- Title text-[22px] thay vì text-xl — hierarchy mạnh hơn
- Border-bottom + pb-5 thay flat layout — content-area rõ vùng
- Description leading-relaxed + slate-500 — dễ đọc hơn

Button:
- shadow-sm + color-tinted shadow (brand/20, red/20) cho primary/
  danger — có chiều sâu
- active:translate-y-[0.5px] micro-press feedback
- Ring offset 2 (thay 1) + offset-white — focus ring tách rõ

Input/Select/Textarea:
- h-9 thay h-10 — phù hợp dense table layouts
- shadow-[inset_0_1px_0_...] — inset highlight tinh tế
- Focus: border-brand-500 + ring-brand-500/20 — 2 lớp chỉ báo
- Disabled: bg-slate-50 + opacity-70 — rõ disabled state

DataTable:
- rounded-xl + shadow-sm + border-200/80 — card feel nhẹ nhàng hơn
- Header: UPPERCASE text-[11px] tracking-wider — ERP enterprise look
- Row hover: bg-brand-50/40 (thay slate-50) — brand-tinted hover
- Padding tăng từ px-3 py-2 → px-4 py-2.5 — breathing room

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fe-admin/src/components/ui/Button.tsx

@@ -3,19 +3,19 @@ import { cva, type VariantProps } from 'class-variance-authority'
 import { cn } from '@/lib/cn'
 
 const buttonVariants = cva(
-  'inline-flex items-center justify-center gap-2 rounded-md text-sm font-medium transition disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-1 focus-visible:ring-brand-500',
+  'inline-flex items-center justify-center gap-2 rounded-md text-sm font-medium transition-colors disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:ring-offset-white focus-visible:ring-brand-500 active:translate-y-[0.5px]',
   {
     variants: {
       variant: {
-        primary: 'bg-brand-600 text-white hover:bg-brand-700',
-        secondary: 'bg-slate-200 text-slate-900 hover:bg-slate-300',
-        outline: 'border border-slate-300 bg-white hover:bg-slate-50',
-        ghost: 'hover:bg-slate-100',
-        danger: 'bg-red-600 text-white hover:bg-red-700',
+        primary: 'bg-brand-600 text-white shadow-sm shadow-brand-600/20 hover:bg-brand-700',
+        secondary: 'bg-slate-100 text-slate-800 hover:bg-slate-200',
+        outline: 'border border-slate-300 bg-white text-slate-700 shadow-sm hover:bg-slate-50 hover:border-slate-400',
+        ghost: 'text-slate-600 hover:bg-slate-100 hover:text-slate-900',
+        danger: 'bg-red-600 text-white shadow-sm shadow-red-600/20 hover:bg-red-700',
       },
       size: {
-        sm: 'h-8 px-3',
-        md: 'h-10 px-4',
+        sm: 'h-8 px-3 text-xs',
+        md: 'h-9 px-4',
         lg: 'h-11 px-6 text-base',
       },
     },