Buat hierarki 3 button:

• .btn-primary → background #2563EB, color white, font-weight 600
• .btn-secondary → background transparent, color #2563EB, border 1px solid #2563EB
• .btn-ghost → background transparent, color #6B7280, tanpa border

Hint

• Button hierarchy: primary (aksi utama), secondary, ghost.
• Primary: background bold + teks putih. Secondary: outline/muted.
• .btn-primary { background: #2563EB; color: white; } .btn-secondary { border: 1px solid; }