diff --git a/engine/platform/platform.h b/engine/platform/platform.h
index e9ea15e3..820c7c86 100644
--- a/engine/platform/platform.h
+++ b/engine/platform/platform.h
@@ -58,6 +58,7 @@ char *Posix_Input( void );
 #if XASH_SDL
 void SDLash_Init( const char *basedir );
 void SDLash_Shutdown( void );
+void SDLash_NanoSleep( int nsec );
 #endif
 
 #if XASH_ANDROID
@@ -171,9 +172,11 @@ static inline void Platform_SetupSigtermHandling( void )
 
 static inline qboolean Platform_NanoSleep( int nsec )
 {
+#if XASH_SDL == 3
+	SDLash_NanoSleep( nsec );
+	return true;
 	// SDL2 doesn't have nanosleep, so use low-level functions here
-	// When this code will be ported to SDL3, use SDL_DelayNS
-#if XASH_POSIX
+#elif XASH_POSIX
 	struct timespec ts = {
 		.tv_sec = 0,
 		.tv_nsec = nsec, // just don't put large numbers here
diff --git a/engine/platform/sdl3/in_sdl3.c b/engine/platform/sdl3/in_sdl3.c
new file mode 100644
index 00000000..2efa61d7
--- /dev/null
+++ b/engine/platform/sdl3/in_sdl3.c
@@ -0,0 +1,215 @@
+/*
+platform_sdl3.h - SDL3 platform definitions
+Copyright (C) 2025 Er2off
+Copyright (C) 2025 Alibek Omarov
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+*/
+#include "platform_sdl3.h"
+#include "eiface.h" // ARRAYSIZE
+#include "vid_common.h" // window_{width,height}
+#include "client.h" // refState
+#include "input.h" // Touch_WantVisibleCursor
+#include "vgui_draw.h" // VGui_UpdateInternalCursorState
+
+static struct
+{
+	qboolean initialized;
+	SDL_Cursor *cursors[dc_last];
+} cursors;
+
+static struct
+{
+	float x, y;
+	qboolean pushed;
+} in_visible_cursor_pos;
+
+void SDLash_InitCursors( void )
+{
+	if( cursors.initialized )
+		SDLash_FreeCursors();
+
+	// load up all default cursors
+	cursors.cursors[dc_none] = NULL;
+	cursors.cursors[dc_arrow] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_DEFAULT );
+	cursors.cursors[dc_ibeam] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_TEXT );
+	cursors.cursors[dc_hourglass] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_WAIT );
+	cursors.cursors[dc_crosshair] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_CROSSHAIR );
+	cursors.cursors[dc_up] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_DEFAULT );
+	cursors.cursors[dc_sizenwse] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_NWSE_RESIZE );
+	cursors.cursors[dc_sizenesw] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_NESW_RESIZE );
+	cursors.cursors[dc_sizewe] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_EW_RESIZE );
+	cursors.cursors[dc_sizens] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_NS_RESIZE );
+	cursors.cursors[dc_sizeall] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_MOVE );
+	cursors.cursors[dc_no] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_NOT_ALLOWED );
+	cursors.cursors[dc_hand] = SDL_CreateSystemCursor( SDL_SYSTEM_CURSOR_POINTER );
+	cursors.initialized = true;
+}
+
+void SDLash_FreeCursors( void )
+{
+	if( !cursors.initialized )
+		return;
+
+	for( int i = 0; i < ARRAYSIZE( cursors.cursors ); i++ )
+	{
+		if( cursors.cursors[i] )
+		{
+			SDL_DestroyCursor( cursors.cursors[i] );
+			cursors.cursors[i] = NULL;
+		}
+	}
+
+	cursors.initialized = false;
+}
+
+qboolean Platform_GetMouseGrab( void )
+{
+	return SDL_GetWindowMouseGrab( host.hWnd );
+}
+
+void Platform_SetMouseGrab( qboolean enable )
+{
+	SDL_SetWindowMouseGrab( host.hWnd, enable );
+}
+
+void Platform_MouseMove( float *x, float *y )
+{
+	SDL_GetRelativeMouseState( x, y );
+}
+
+void GAME_EXPORT Platform_SetMousePos( int x, int y )
+{
+	SDL_WarpMouseInWindow( host.hWnd, x, y );
+}
+
+void GAME_EXPORT Platform_GetMousePos( int *x, int *y )
+{
+	float m_x = 0.0f, m_y = 0.0f;
+
+	SDL_GetMouseState( &m_x, &m_y );
+
+	if( x )
+	{
+		if( window_width.value && window_width.value != refState.width )
+		{
+			float factor = refState.width / window_width.value;
+			*x = m_x * factor;
+		}
+		else *x = m_x;
+	}
+
+	if( y )
+	{
+		if( window_height.value && window_height.value != refState.height )
+		{
+			float factor = refState.height / window_height.value;
+			*y = m_y * factor;
+		}
+		else *y = m_y;
+	}
+}
+
+void Platform_SetCursorType( VGUI_DefaultCursor type )
+{
+	qboolean visible = type != dc_user && type != dc_none;
+
+	// never disable cursor in touch emulation mode
+	if( !visible && Touch_WantVisibleCursor( ))
+		return;
+
+	host.mouse_visible = visible;
+	VGui_UpdateInternalCursorState( type );
+
+	if( visible )
+	{
+		if( cursors.initialized )
+			SDL_SetCursor( cursors.cursors[type] );
+
+		SDL_ShowCursor();
+
+		// restore the last mouse position
+		if( in_visible_cursor_pos.pushed )
+		{
+			SDL_WarpMouseInWindow( host.hWnd, in_visible_cursor_pos.x, in_visible_cursor_pos.y );
+			in_visible_cursor_pos.pushed = false;
+		}
+	}
+	else
+	{
+		// save last mouse position and warp it to the center
+		if( !in_visible_cursor_pos.pushed )
+		{
+			SDL_GetMouseState( &in_visible_cursor_pos.x, &in_visible_cursor_pos.y );
+			SDL_WarpMouseInWindow( host.hWnd, host.window_center_x, host.window_center_y );
+			in_visible_cursor_pos.pushed = true;
+		}
+
+		SDL_HideCursor();
+	}
+}
+
+void Platform_EnableTextInput( qboolean enable )
+{
+	enable ? SDL_StartTextInput( host.hWnd ) : SDL_StopTextInput( host.hWnd );
+}
+
+int Platform_GetClipboardText( char *buffer, size_t size )
+{
+	int len;
+	char *text = SDL_GetClipboardText();
+
+	if( !text )
+		return 0;
+
+	if( buffer && size > 0 )
+		len = Q_strncpy( buffer, text, size );
+	else
+		len = Q_strlen( text );
+
+	SDL_free( text );
+
+	return len;
+}
+
+void Platform_SetClipboardText( const char *buffer )
+{
+	SDL_SetClipboardText( buffer );
+}
+
+key_modifier_t Platform_GetKeyModifiers( void )
+{
+	SDL_Keymod mod_flags = SDL_GetModState();
+	key_modifier_t result_flags = KeyModifier_None;
+
+	if( FBitSet( mod_flags, SDL_KMOD_LCTRL ))
+		SetBits( result_flags, KeyModifier_LeftCtrl );
+	if( FBitSet( mod_flags, SDL_KMOD_RCTRL ))
+		SetBits( result_flags, KeyModifier_RightCtrl );
+	if( FBitSet( mod_flags, SDL_KMOD_RSHIFT ))
+		SetBits( result_flags, KeyModifier_RightShift );
+	if( FBitSet( mod_flags, SDL_KMOD_LSHIFT ))
+		SetBits( result_flags, KeyModifier_LeftShift );
+	if( FBitSet( mod_flags, SDL_KMOD_LALT ))
+		SetBits( result_flags, KeyModifier_LeftAlt );
+	if( FBitSet( mod_flags, SDL_KMOD_RALT ))
+		SetBits( result_flags, KeyModifier_RightAlt );
+	if( FBitSet( mod_flags, SDL_KMOD_NUM ))
+		SetBits( result_flags, KeyModifier_NumLock );
+	if( FBitSet( mod_flags, SDL_KMOD_CAPS ))
+		SetBits( result_flags, KeyModifier_CapsLock );
+	if( FBitSet( mod_flags, SDL_KMOD_RGUI ))
+		SetBits( result_flags, KeyModifier_RightSuper );
+	if( FBitSet( mod_flags, SDL_KMOD_LGUI ))
+		SetBits( result_flags, KeyModifier_LeftSuper );
+
+	return result_flags;
+}
diff --git a/engine/platform/sdl3/platform_sdl3.h b/engine/platform/sdl3/platform_sdl3.h
new file mode 100644
index 00000000..f578cba2
--- /dev/null
+++ b/engine/platform/sdl3/platform_sdl3.h
@@ -0,0 +1,28 @@
+/*
+platform_sdl3.h - SDL3 platform definitions
+Copyright (C) 2025 Er2off
+Copyright (C) 2025 Alibek Omarov
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+*/
+#ifndef PLATFORM_SDL3_H
+#define PLATFORM_SDL3_H
+
+#include <SDL3/SDL.h>
+#include "platform/platform.h"
+
+//
+// in_sdl3.c
+//
+void SDLash_InitCursors( void );
+void SDLash_FreeCursors( void );
+
+#endif // PLATFORM_SDL3_H
diff --git a/engine/platform/sdl3/sys_sdl3.c b/engine/platform/sdl3/sys_sdl3.c
new file mode 100644
index 00000000..6e60fcda
--- /dev/null
+++ b/engine/platform/sdl3/sys_sdl3.c
@@ -0,0 +1,121 @@
+/*
+platform_sdl3.h - SDL3 platform definitions
+Copyright (C) 2025 Er2off
+Copyright (C) 2025 Alibek Omarov
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+*/
+#include "platform_sdl3.h"
+#include "common.h"
+
+#if XASH_TIMER == TIMER_SDL
+double Platform_DoubleTime( void )
+{
+	static Uint64 g_PerformanceFrequency;
+	static Uint64 g_ClockStart;
+	Uint64 CurrentTime;
+
+	if( !g_PerformanceFrequency )
+	{
+		g_PerformanceFrequency = SDL_GetPerformanceFrequency();
+		g_ClockStart = SDL_GetPerformanceCounter();
+
+		return 0.0;
+	}
+
+	CurrentTime = SDL_GetPerformanceCounter();
+	return (double)( CurrentTime - g_ClockStart ) / (double)( g_PerformanceFrequency );
+}
+
+void Platform_Sleep( int msec )
+{
+	SDL_Delay( msec );
+}
+#endif // XASH_TIMER == TIMER_SDL
+
+#if XASH_MESSAGEBOX == MSGBOX_SDL
+void Platform_MessageBox( const char *title, const char *message, qboolean parentMainWindow )
+{
+	SDL_ShowSimpleMessageBox( SDL_MESSAGEBOX_ERROR, title, message, parentMainWindow ? host.hWnd : NULL );
+}
+#endif
+
+void SDLash_NanoSleep( int nsec )
+{
+	SDL_DelayNS( nsec );
+}
+
+static const char *SDLash_CategoryToString( int category )
+{
+	switch( category )
+	{
+	case SDL_LOG_CATEGORY_APPLICATION: return "App";
+	case SDL_LOG_CATEGORY_ERROR: return "Error";
+	case SDL_LOG_CATEGORY_ASSERT: return "Assert";
+	case SDL_LOG_CATEGORY_SYSTEM: return "System";
+	case SDL_LOG_CATEGORY_AUDIO: return "Audio";
+	case SDL_LOG_CATEGORY_VIDEO: return "Video";
+	case SDL_LOG_CATEGORY_RENDER: return "Render";
+	case SDL_LOG_CATEGORY_INPUT: return "Input";
+	case SDL_LOG_CATEGORY_TEST: return "Test";
+	case SDL_LOG_CATEGORY_GPU: return "GPU";
+	default: return "Unknown";
+	}
+}
+
+static void SDLCALL SDLash_LogOutputFunction( void *userdata, int category, SDL_LogPriority priority, const char *message )
+{
+	switch( priority )
+	{
+	case SDL_LOG_PRIORITY_CRITICAL:
+	case SDL_LOG_PRIORITY_ERROR:
+		Con_Printf( S_ERROR S_BLUE "SDL" S_DEFAULT ": [%s] %s\n", SDLash_CategoryToString( category ), message );
+		break;
+	case SDL_LOG_PRIORITY_WARN:
+		Con_DPrintf( S_WARN S_BLUE "SDL" S_DEFAULT ": [%s] %s\n", SDLash_CategoryToString( category ), message );
+		break;
+	case SDL_LOG_PRIORITY_INFO:
+		Con_Reportf( S_NOTE S_BLUE "SDL" S_DEFAULT ": [%s] %s\n", SDLash_CategoryToString( category ), message );
+		break;
+	default:
+		Con_Reportf( S_BLUE "SDL" S_DEFAULT ": [%s] %s\n", SDLash_CategoryToString( category ), message );
+		break;
+	}
+}
+
+void SDLash_Init( const char *basedir )
+{
+	SDL_SetLogOutputFunction( SDLash_LogOutputFunction, NULL );
+
+	if( host_developer.value >= 2 )
+		SDL_SetLogPriorities( SDL_LOG_PRIORITY_VERBOSE );
+	else if( host_developer.value >= 1 )
+		SDL_SetLogPriorities( SDL_LOG_PRIORITY_WARN );
+	else
+		SDL_SetLogPriorities( SDL_LOG_PRIORITY_ERROR );
+
+	if( !SDL_Init( SDL_INIT_VIDEO | SDL_INIT_EVENTS ))
+	{
+		Sys_Warn( "SDL_Init failed: %s", SDL_GetError( ));
+		host.type = HOST_DEDICATED;
+	}
+
+	SDL_SetHint( SDL_HINT_MOUSE_TOUCH_EVENTS, "0" );
+	SDL_SetHint( SDL_HINT_TOUCH_MOUSE_EVENTS, "0" );
+
+	SDLash_InitCursors();
+}
+
+void SDLash_Shutdown( void )
+{
+	SDLash_FreeCursors();
+	SDL_Quit();
+}